Integrated Taxonomic Information System - Search Results

Results of: Search in every Kingdom for Taxon Author(s) Name(s) containing 'Rydb.'
 
 Kingdom Plantae
  Potamogeton richardsoni (A. Benn.) Rydb. – not accepted
  Potamogeton richardsonii (A. Benn.) Rydb. – accepted – Richardson's pondweed, red-head pondweed, Richardson pondweed
  Geoprumnon mexicanum (A. DC.) Rydb. – not accepted
  Quercus novomexicana (A. DC.) Rydb. – not accepted
  Quercus utahensis (A. DC.) Rydb. – not accepted
  Geoprumnon tennesseense (A. Gray ex Chapm.) Rydb. – not accepted
  Penstemon pachyphyllus A. Gray ex Rydb. – accepted – thickleaf penstemon, thickleaf beardtongue
  Penstemon pachyphyllus var. pachyphyllus A. Gray ex Rydb. – accepted – thickleaf beardtongue
  Allioniella oxybaphoides (A. Gray) Rydb. – not accepted
  Amauriopsis dissecta (A. Gray) Rydb. – accepted – ragleaf bahia
  Antheropeas lanosum (A. Gray) Rydb. – not accepted – white easterbonnets, white easter-bonnets
  Antheropeas wallacei (A. Gray) Rydb. – not accepted – woolly easterbonnets, woolly easter-bonnets, Wallace's woolydaisy
  Aster apricus (A. Gray) Rydb. – not accepted
  Benthamantha glabella (A. Gray) Rydb. – not accepted
  Besseya alpina (A. Gray) Rydb. – not accepted – alpine besseya
  Blephariglotis peramoena (A. Gray) Rydb. – not accepted
  Blephariglottis peramoena (A. Gray) Rydb. – not accepted
  Carduus americanus (A. Gray) Rydb. – not accepted
  Cryptantha calycosa (A. Gray) Rydb. – not accepted
  Dugaldia hoopesii (A. Gray) Rydb. – not accepted
  Dysodiopsis (A. Gray) Rydb. – accepted – dogfennel
  Ericameria paniculata (A. Gray) Rydb. – accepted – Mojave rabbitbrush, desert rabbitbrush
  Erigeron debilis (A. Gray) Rydb. – not accepted
  Eritrichium howardii (A. Gray) Rydb. – accepted – Howard's alpine forget-me-not
  Eschenbachia coulteri (A. Gray) Rydb. – not accepted
  Galium asperulum (A. Gray) Rydb. – not accepted
  Giliastrum acerosum (A. Gray) Rydb. – accepted – bluebowls
  Hesperidanthus linearifolius (A. Gray) Rydb. – accepted – slimleaf plainsmustard
  Horkelia sericea (A. Gray) Rydb. – not accepted
  Hulsea larsenii (A. Gray) Rydb. – not accepted
  Isocoma wrightii (A. Gray) Rydb. – not accepted
  Lappula americana (A. Gray) Rydb. – not accepted
  Leptodactylon nuttallii (A. Gray) Rydb. – not accepted
  Leptodactylon watonii (A. Gray) Rydb. – not accepted
  Leptodactylon watsonii (A. Gray) Rydb. – not accepted – Watson's prickly gilia, Watson's prickly phlox
  Leuciva dealbata (A. Gray) Rydb. – accepted – woolly marsh elder
  Limnorchis thurberi (A. Gray) Rydb. – not accepted
  Myzorrhiza cooperi (A. Gray) Rydb. – not accepted
  Myzorrhiza tuberosa (A. Gray) Rydb. – not accepted
  Nuttallia humilis (A. Gray) Rydb. – not accepted
  Odontotrichum decompositum (A. Gray) Rydb. – not accepted
  Oreobatus neomexicanus (A. Gray) Rydb. – not accepted
  Oreochrysum parryi (A. Gray) Rydb. – accepted – Parry's goldenrod
  Orophaca tridactylica (A. Gray) Rydb. – not accepted
  Oxycoccus intermedius (A. Gray) Rydb. – not accepted
  Pectiantia breweri (A. Gray) Rydb. – not accepted
  Pediomelum cyphocalyx (A. Gray) Rydb. – accepted – turniproot
  Penstemon thompsoniae (A. Gray) Rydb. – accepted – Thompson's penstemon, Thompson's beardtongue
  Penstemon thompsoniae ssp. thompsoniae (A. Gray) Rydb. – not accepted – Thompson's penstemon, Thompson's beardtongue
  Phacelia lyallii (A. Gray) Rydb. – accepted – alpine phacelia
  Phacelia lyonii (A. Gray) Rydb. – accepted – Lyon's phacelia
  Physalis heterophylla var. ambigua (A. Gray) Rydb. – not accepted
  Picradeniopsis woodhousei (A. Gray) Rydb. – accepted – Woodhouse's bahia, Woodhouse's false bahia
  Platyschkuhria integrifolia (A. Gray) Rydb. – accepted – basindaisy, desert basindaisy, oblongleaf basindaisy, basin daisy, oblongleaf bahia
  Platyschkuhria integrifolia var. integrifolia (A. Gray) Rydb. – not accepted – basindaisy
  Platyschkuhria oblongifolia (A. Gray) Rydb. – not accepted
  Prenanthella exigua (A. Gray) Rydb. – accepted – brightwhite, feeble prenanthella
  Psorothamnus emoryi (A. Gray) Rydb. – accepted – dyebush, white dalea
  Psorothamnus scoparius (A. Gray) Rydb. – accepted – broom dalea
  Psorothamnus scoparus (A. Gray) Rydb. – not accepted
  Raillardiopsis muirii (A. Gray) Rydb. – not accepted – Muir's raillardiopsis
  Sida sagittifolia (A. Gray) Rydb. – not accepted
  Sphaeralcea leptophylla (A. Gray) Rydb. – accepted – scaly globemallow
  Stanleyella wrightii (A. Gray) Rydb. – not accepted
  Stellariopsis santolinoides (A. Gray) Rydb. – not accepted
  Stenanthella occidentalis (A. Gray) Rydb. – not accepted
  Synthyris laciniata (A. Gray) Rydb. – accepted – western kittentails
  Synthyris laciniata ssp. laciniata (A. Gray) Rydb. – not accepted – western kittenstails
  Taraxacum scopulorum (A. Gray) Rydb. – accepted – harp dandelion
  Tiquiliopsis palmeri (A. Gray) Rydb. – not accepted
  Toxicoscordion nuttallii (A. Gray) Rydb. – accepted – Nuttall's deathcamas
  Trollius albiflorus (A. Gray) Rydb. – accepted
  Vesicarpa potentilloides (A. Gray) Rydb. – not accepted
  Vesicarpa potentilloides var. potentilloides (A. Gray) Rydb. – not accepted
  Xylorhiza coloradoensis (A. Gray) Rydb. – not accepted
  Diphysa thurberi (A. Gray) Rydb. ex Standl. – accepted – Thurber's diphysa
  Sphaeralcea arizonica A. Heller ex Rydb. – not accepted
  Agastache pallidiflora (A. Heller) Rydb. – accepted – Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. pallidiflora (A. Heller) Rydb. – accepted – pallid flower giant hyssop, Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. pallidiflora var. pallidiflora (A. Heller) Rydb. – not accepted – Bill Williams Mountain giant hyssop, pallid flower giant hyssop
  Agastache pallidiflora var. pallidiflora (A. Heller) Rydb. – accepted – Bill Williams Mountain giant hyssop
  Penstemon angustifolius var. caudatus (A. Heller) Rydb. – accepted – broadbeard beardtongue
  Arceuthobium cyanocarpum (A. Nelson ex Rydb.) A. Nelson – not accepted – limber pine dwarf mistletoe
  Artemisia pabularis (A. Nelson) Rydb. – not accepted
  Baileya perennis (A. Nelson) Rydb. – not accepted
  Besseya wyomingensis (A. Nelson) Rydb. – not accepted – Wyoming kittentail, Wyoming besseya
  Miltitzia scopulina (A. Nelson) Rydb. – not accepted
  Oenothera ornata (A. Nelson) Rydb. – not accepted
  Physaria lanata (A. Nelson) Rydb. – not accepted
  Prunus melanocarpa (A. Nelson) Rydb. – not accepted
  Swida instolonea (A. Nelson) Rydb. – not accepted
  Equisetum intermedium (A.A. Eaton) Rydb. – not accepted
  Sibbaldiopsis tridentata (Aiton) Rydb. – accepted – shrubby fivefingers, shrubby-fivefingers
  Salix pseudocordata (Andersson) Rydb. – not accepted
  Salix sericea var. subsericea (Andersson) Rydb. – not accepted
  Salix stricta (Andersson) Rydb. – not accepted
  Salix pseudocordata auct. non (Andersson) Rydb. – not accepted
  Flaveria oppositifolia auct. non (DC.) Rydb. – not accepted
  Dasiphora fruticosa auct. non (L.) Rydb. – not accepted
  Agrostis variabilis auct. non Rydb. – not accepted – mountain bentgrass
  Antennaria umbrinella auct. non Rydb. – not accepted
  Hieracium columbianum auct. non Rydb. – not accepted
  Potentilla pseudosericea auct. non Rydb. – not accepted
  Hieracium scabriusculum var. columbianum auct. non (Rydb.) Lepage – not accepted
  Cirsium tweedyi auct. non (Rydb.) Petr. – not accepted
  Ximenesia exauriculata (B.L. Rob. & Greenm.) Rydb. – not accepted
  Thermopsis ovata (B.L. Rob. ex Piper) Rydb. – not accepted
  Hesperidanthus (B.L. Rob.) Rydb. – accepted
  Wahlbergella tayloriae (B.L. Rob.) Rydb. – not accepted
  Sphaeralcea elata (Baker f.) Rydb. – not accepted
  Lysiella obtusata (Banks ex Pursh) Rydb. – not accepted
  Eriocoma caduca (Beal) Rydb. – not accepted
  Salix watsonii (Bebb) Rydb. – not accepted
  Sparganium acaule (Beeby ex Macoun) Rydb. – not accepted
  Atriplex tetraptera (Benth.) Rydb. – not accepted
  Giliastrum rigidulum (Benth.) Rydb. – accepted – bluebowls
  Mimulus tolmiei (Benth.) Rydb. – not accepted
  Pseudobahia bahiifolia (Benth.) Rydb. – accepted – Hartweg's golden sunburst
  Quamoclidion laevis (Benth.) Rydb. – not accepted
  Elaeagnus commutata Bernh. ex Rydb. – accepted – silverberry
  Blephariglotis grandiflora (Bigelow) Rydb. – not accepted
  Blephariglottis grandiflora (Bigelow) Rydb. – not accepted
  Solanum ehrenbergii (Bitter) Rydb. – accepted
  Solanum X michoacanum (Bitter) Rydb. – accepted
  Atenia montana (Blank.) Rydb. – not accepted
  Hesperopeuce mertensiana (Bong.) Rydb. – not accepted
  Giliastrum (Brand) Rydb. – accepted
  Polemonium intermedium (Brand) Rydb. – not accepted
  Mentha penardii (Briq.) Rydb. – not accepted
  Anemone piperi Britton ex Rydb. – accepted – Piper's anemone
  Negundo interius (Britton) Rydb. – not accepted
  Mitella X intermedia Bruhin ex Small & Rydb. (pro. sp.) – accepted – intermediate miterwort
  Quercus mohriana Buckley ex Rydb. – accepted – Mohr's oak, Mohr's shinoak
  Vulpia reflexa (Buckley) Rydb. – not accepted
  Pediomelum subulatum (Bush) Rydb. – not accepted
  Cercocarpus eximius (C.K. Schneid.) Rydb. – not accepted
  Spiraea stevenii (C.K. Schneid.) Rydb. – accepted – beauverd spirea
  Salix idahoensis (C.R. Ball) Rydb. – not accepted
  Erigeron ochroleucus var. scribneri (Canby ex Rydb.) Cronquist – not accepted – buff fleabane
  Petrophyton hendersonii (Canby) Rydb. – not accepted – Olympic Mountain rockmat
  Petrophytum hendersonii (Canby) Rydb. – accepted – Olympic Mountain rockmat
  Myzorrhiza californica (Cham. & Schltdl.) Rydb. – not accepted
  Limnorchis viridiflora (Cham.) Rydb. – not accepted
  Ivesia eremica (Coville) Rydb. – not accepted
  Stenotopsis interior (Coville) Rydb. – not accepted
  Rosa woodsii var. fendleri (Crép.) Rydb. – not accepted – Fendler rose
  Erigeron arenarioides (D.C. Eaton ex A. Gray) A. Gray ex Rydb. – accepted – sand fleabane
  Antennaria macrocephala (D.C. Eaton) Rydb. – not accepted
  Conimitella williamsii (D.C. Eaton) Rydb. – accepted – Williams' miterwort
  Sphaeromeria diversifolia (D.C. Eaton) Rydb. – accepted – separateleaf chickensage
  Achillea occidentalis (DC.) Raf. ex Rydb. – not accepted
  Franseria confertiflora (DC.) Rydb. – not accepted
  Hoita macrostachya (DC.) Rydb. – accepted – large leather-root
  Stenotopsis linearifolia (DC.) Rydb. – not accepted
  Rorippa palustris var. hispida (Desv.) Rydb. – not accepted
  Robinia luxurians (Dieck) Rydb. – not accepted
  Koeleria latifrons (Domin) Rydb. – not accepted
  Strobus monticola (Douglas ex D. Don) Rydb. – not accepted
  Leucocraspedum albicaule (Douglas ex Griseb.) Rydb. – not accepted
  Besseya rubra (Douglas ex Hook.) Rydb. – not accepted – red besseya, red kittentail
  Cnemidophacos pectinatus (Douglas ex Hook.) Rydb. – not accepted
  Montiastrum lineare (Douglas ex Hook.) Rydb. – not accepted
  Phymosia rivularis (Douglas ex Hook.) Rydb. – not accepted
  Pisophaca flexuosa (Douglas ex Hook.) Rydb. – not accepted
  Tium drummondii (Douglas ex Hook.) Rydb. – not accepted
  Androcera rostrata (Dunal) Rydb. – not accepted
  Physalis heterophylla var. nyctaginea (Dunal) Rydb. – not accepted
  Pseudobahia heermannii (Durand) Rydb. – accepted – foothill sunburst
  Apinus flexilis (E. James) Rydb. – not accepted
  Besseya plantaginea (E. James) Rydb. – not accepted – White River coraldrops
  Achillea nigrescens (E. Mey.) Rydb. – not accepted
  Plantago septata E. Morris ex Rydb. – not accepted
  Phaca bodinii (E. Sheld.) Rydb. – not accepted
  Phaca intonsa (E. Sheld.) Rydb. ex Small – not accepted
  Antennaria albescens (E.E. Nelson) Rydb. – not accepted
  Pellaea occidentalis (E.E. Nelson) Rydb. – not accepted
  Comandra californica Eastw. ex Rydb. – not accepted
  Comandra umbellata var. californica (Eastw. ex Rydb.) C.L. Hitchc. – not accepted
  Comandra umbellata ssp. californica (Eastw. ex Rydb.) Piehl – accepted – California bastard toadflax, bastard toadflax
  Besseya ritteriana (Eastw.) Rydb. – not accepted – Ritter's coraldrops
  Chamaechaenactis scaposa (Eastw.) Rydb. – accepted – fullstem
  Chamaechaenactis scaposa var. scaposa (Eastw.) Rydb. – not accepted – fullstem
  Cirsium bipinnatum (Eastw.) Rydb. – not accepted
  Cirsium diffusum (Eastw.) Rydb. – not accepted
  Psoralidium junceum (Eastw.) Rydb. – accepted – rush lemonweed
  Raillardiopsis scabrida (Eastw.) Rydb. – not accepted – leafy raillardiopsis
  Thelypodiopsis aurea (Eastw.) Rydb. – accepted – Durango tumblemustard
  Besseya bullii (Eaton) Rydb. – not accepted – Bull's coraldrops
  Fragaria vesca var. alba (Ehrh.) Rydb. – not accepted
  Antennaria angustifolia Ekman non Rydb. – not accepted
  Echinochloa crus-galli var. mutica (Elliott) Rydb. – not accepted
  Phaca obcordata (Elliott) Rydb. ex Small – not accepted
  Galarhoeus arkansanus (Engelm. & A. Gray) Small ex Rydb. – not accepted
  Neomammillaria similis (Engelm.) Britton & Rose ex Rydb. – not accepted
  Galarhoeus commutatus (Engelm. ex A. Gray) Small ex Rydb. – not accepted
  Chamaesyce rugulosa (Engelm. ex Millsp.) Rydb. – not accepted
  Apinus albicaulis (Engelm.) Rydb. – not accepted
  Chamaesyce exstipulata (Engelm.) Rydb. – not accepted
  Chamaesyce flagelliformis (Engelm.) Rydb. – not accepted
  Chamaesyce parryi (Engelm.) Rydb. – not accepted – Parry's spurge, Parry's sandmat
  Clistoyucca brevifolia (Engelm.) Rydb. – not accepted
  Coryphantha radiosa (Engelm.) Rydb. – not accepted
  Cuscuta curta (Engelm.) Rydb. – not accepted
  Galarhoeus robustus (Engelm.) Rydb. – not accepted
  Rorippa calycina (Engelm.) Rydb. – accepted – persistent-sepal yellowcress, persistent sepal yellowcress
  Sabina monosperma (Engelm.) Rydb. – not accepted
  Sabina utahensis (Engelm.) Rydb. – not accepted
  Wahlbergella attenuata (Farr) Rydb. – not accepted
  Zizania interior (Fassett) Rydb. – not accepted
  Parnassia montanensis Fernald & Rydb. – not accepted
  Parnassia palustris var. montanensis (Fernald & Rydb. ex Rydb.) C.L. Hitchc. – not accepted – mountain grass of Parnassus, northern grass-of-Parnassus
  Goodyera ophioides (Fernald) Rydb. – not accepted
  Pectis cylindrica (Fernald) Rydb. – accepted – Sonoran chinchweed, Sonoran cinchweed
  Peramium ophioides (Fernald) Rydb. – not accepted
  Stachys homotricha (Fernald) Rydb. – not accepted
  Agrimonia macrocarpa (Focke) Rydb. – not accepted
  Rubus melanotrachys (Focke) Rydb. – not accepted
  Drymocallis Fourr. ex Rydb. – accepted
  Oligoneuron riddellii (Frank ex Riddell) Rydb. – not accepted – Riddell's goldenrod
  Astragalus brevidens (Gand.) Rydb. – not accepted
  Myzorrhiza pinorum (Geyer ex Hook.) Rydb. – not accepted
  Arabis holboellii var. retrofracta (Graham) Rydb. – not accepted – a holboell rock-cress, second rockcress
  Gaultheria humifusa (Graham) Rydb. – accepted – western wintergreen, alpine spicywintergreen
  Ozomelis trifida (Graham) Rydb. – not accepted
  Artemisia angustifolia (Gray) Rydb. – not accepted
  Apocynum scopulorum Greene ex Rydb. – not accepted
  Artemisia neomexicana Greene ex Rydb. – not accepted
  Astragalus earlei Greene ex Rydb. – not accepted
  Erigeron superbus Greene ex Rydb. – not accepted
  Lathyrus laetivirens Greene ex Rydb. – accepted – aspen pea, aspen vetchling, aspen peavine, plateau peavine
  Machaeranthera glabella Greene ex Rydb. – not accepted
  Ribes valicola Greene ex Rydb. – not accepted
  Senecio heterodoxus Greene ex Rydb. – not accepted
  Trifolium oxydon Greene ex Rydb. – not accepted
  Trifolium oxyodon Greene ex Rydb. – not accepted
  Trifolium salictorum Greene ex Rydb. – not accepted
  Astragalus mollissimus var. marcidus (Greene ex Rydb.) Barneby – accepted – withered wooly milk-vetch, woolly locoweed, Davis Mountains locoweed, woolly milkvetch
  Lathyrus leucanthus var. laetivirens (Greene ex Rydb.) C.L. Hitchc. – not accepted
  Astragalus recedens (Greene ex Rydb.) Ced. Porter – not accepted
  Astragalus bigelovii var. marcidus (Greene ex Rydb.) Isely – not accepted
  Trifolium parryi ssp. salictorum (Greene ex Rydb.) J.M. Gillett – accepted – Parry's clover
  Lathyrus lanszwertii var. laetivirens (Greene ex Rydb.) S.L. Welsh – not accepted
  Astragalus mollissimus var. earlei (Greene ex Rydb.) Tidestr. – accepted – woolly locoweed, Earle's woolly locoweed, Earle's woolly milkvetch
  Chamomilla occidentalis (Greene) Rydb. – not accepted
  Cirsium macounii (Greene) Rydb. – not accepted
  Dasystephana interrupta (Greene) Rydb. – not accepted
  Drymocallis ashlandica (Greene) Rydb. – accepted – Ashland cinquefoil
  Drymocallis hansenii (Greene) Rydb. – accepted – Hansen's cinquefoil
  Drymocallis lactea (Greene) Rydb. – accepted
  Drymocallis lactea var. lactea (Greene) Rydb. – accepted – Sierran drymocallis, wood beauty
  Erysimum amoenum (Greene) Rydb. – not accepted
  Erysimum argillosum (Greene) Rydb. – not accepted
  Erysimum asperrimum (Greene) Rydb. – not accepted
  Erysimum nivale (Greene) Rydb. – not accepted
  Gilia arizonica (Greene) Rydb. – not accepted
  Helenium rivulare (Greene) Rydb. – not accepted
  Horkelia clevelandii (Greene) Rydb. – accepted – Cleveland's horkelia
  Horkelia clevelandii var. clevelandii (Greene) Rydb. – accepted – Cleveland's horkelia
  Horkelia daucifolia (Greene) Rydb. – accepted – carrotleaf horkelia
  Horkelia daucifolia ssp. daucifolia (Greene) Rydb. – not accepted – carrotleaf horkelia
  Horkelia daucifolia var. daucifolia (Greene) Rydb. – accepted – carrotleaf horkelia
  Horkelia elata (Greene) Rydb. – not accepted
  Horkelia frondosa (Greene) Rydb. – not accepted
  Horkelia howellii (Greene) Rydb. – accepted
  Lepidium crenatum (Greene) Rydb. – accepted – alkali pepperweed
  Limnanthes versicolor (Greene) Rydb. – not accepted
  Ozomelis diversifolia (Greene) Rydb. – not accepted
  Pectiantia ovalis (Greene) Rydb. – not accepted
  Piperia michaeli (Greene) Rydb. – not accepted
  Piperia michaelii (Greene) Rydb. – not accepted – Michael's piperia
  Rubus acalyphaceus (Greene) Rydb. – not accepted
  Rubus arizonicus (Greene) Rydb. – not accepted
  Rubus nigerrimus (Greene) Rydb. – not accepted – dark raspberry
  Rubus peramoenus (Greene) Rydb. – not accepted
  Rubus subarcticus (Greene) Rydb. – not accepted
  Rubus viburnifolius (Greene) Rydb. – not accepted
  Sideranthus australis (Greene) Rydb. – not accepted
  Sieversia campanulata (Greene) Rydb. – not accepted
  Sieversia canescens (Greene) Rydb. – not accepted
  Sphaeralcea digitata (Greene) Rydb. – accepted – juniper globemallow, slippery globemallow
  Sphaeralcea digitata ssp. digitata (Greene) Rydb. – not accepted – juniper globemallow
  Spraguea monosperma (Greene) Rydb. – not accepted
  Tesseranthium macrophyllum (Greene) Rydb. – not accepted
  Vagnera liliacea (Greene) Rydb. – not accepted
  Senecio multicapitatus Greenm. ex Rydb. – not accepted
  Senecio spartioides var. multicapitatus (Greenm. ex Rydb.) S.L. Welsh – not accepted – broom-like ragwort, many-head ragwort, ragwort groundsel
  Castilleja lutescens (Greenm.) Rydb. – accepted – stiff yellow Indian paintbrush
  Dasystephana affinis (Griseb.) Rydb. – not accepted
  Ivesia callida (H.M. Hall) Rydb. – accepted – Tahquitz mousetail, Tahquitz ivesia
  Hulsea callicarpha (H.M. Hall) S. Watson ex Rydb. – not accepted
  Festuca ingrata (Hack. ex Beal) Rydb. – not accepted
  Festuca ingrata var. ingrata (Hack. ex Beal) Rydb. – not accepted
  Greeneocharis circumscissa (Hook. & Arn.) Rydb. – not accepted
  Hoita strobilina (Hook. & Arn.) Rydb. – accepted – Loma prieta
  Sphaeralcea grossulariifolia (Hook. & Arn.) Rydb. – accepted – gooseberryleaf globemallow, currant-leaf globemallow, gooseberry-leaf globemallow
  Sphaeralcea grossulariifolia ssp. grossulariifolia (Hook. & Arn.) Rydb. – not accepted – gooseberryleaf globemallow
  Acrolasia albicaulis (Hook.) Rydb. – not accepted
  Astragalus aboriginorum var. glabriusculus (Hook.) Rydb. – not accepted
  Atelophragma elegans (Hook.) Rydb. – not accepted
  Azaleastrum albiflorum (Hook.) Rydb. – not accepted
  Batidophaca lotiflora (Hook.) Rydb. – not accepted
  Batidophaca lotiflorus (Hook.) Rydb. – not accepted
  Diholcos bisulcatus (Hook.) Rydb. – not accepted
  Erigeron minor (Hook.) Rydb. – not accepted
  Leucophysalis grandiflora (Hook.) Rydb. – accepted – large false groundcherry
  Mentha glabrior (Hook.) Rydb. – not accepted
  Nemexia lasioneura (Hook.) Rydb. – not accepted
  Pectiantia pentandra (Hook.) Rydb. – not accepted
  Saussurea densa (Hook.) Rydb. – not accepted – clustered sawwort
  Wahlbergella drummondii (Hook.) Rydb. – not accepted
  Phaca americana (Hook.) Rydb. ex Britton & A. Br. – not accepted
  Phyllodoce X intermedia (Hook.) Rydb. (pro sp.) – accepted – hybrid mountainheath
  Crepis runcinata var. hispidulosa Howell ex Rydb. – not accepted
  Crepis runcinata ssp. hispidulosa (Howell ex Rydb.) Babc. & Stebbins – accepted – fiddleleaf hawksbeard
  Psilochenia runcinata ssp. hispidulosa (Howell ex Rydb.) W.A. Weber – not accepted
  Filipendula denudata (J. Presl & C. Presl) Rydb. – not accepted
  Lathyrus stipulaceus var. incanus (J.G. Sm. & Rydb.) Butters & H. St. John – not accepted
  Lathyrus polymorphus ssp. incanus (J.G. Sm. & Rydb.) C.L. Hitchc. – not accepted – hoary pea, hoary vetchling
  Lathyrus polymorphus var. incanus (J.G. Sm. & Rydb.) Dorn – accepted – hoary pea
  Lathyrus incanus (J.G. Sm. & Rydb.) Rydb. – not accepted
  Oreoxis macdougalii (J.M. Coult. & Rose) Rydb. – not accepted
  Echinocactus xeranthemoides (J.M. Coult.) Engelm. ex Rydb. – not accepted
  Bromus ciliatus var. porteri (J.M. Coult.) Rydb. – not accepted
  Flaveria X latifolia (J.R. Johnst.) Long & Rhamstine non Flaveria latifolia (J.R. Johnst.) Rydb. – not accepted
  Flaveria latifolia (J.R. Johnst.) Rydb. – not accepted
  Sesban bispinosus (Jacq.) Rydb. – not accepted
  Cyanococcus canadensis (Kalm ex A. Rich.) Rydb. – not accepted
  Cyanococcus vacillans (Kalm ex Torr.) Rydb. – not accepted
  Astragalus amblyodon Kearney ex Rydb. – not accepted
  Agrimonia bicknellii (Kearney) Rydb. – not accepted – Bicknell's groovebur
  Calamagrostis elongata (Kearney) Rydb. – not accepted
  Calamagrostis luxurians (Kearney) Rydb. – not accepted
  Tiarella californica (Kellogg) Rydb. – not accepted
  Anticlea virescens (Kunth) Rydb. – accepted – green deathcamas
  Dasyochloa pulchella (Kunth) Willd. ex Rydb. – accepted – low woollygrass, fluffgrass
  Tium michauxii (Kuntze) Rydb. – not accepted
  Argentina anserina (L.) Rydb. – not accepted – silverweed cinquefoil
  Argentina argentea (L.) Rydb. – not accepted
  Atelophragma alpinum (L.) Rydb. – not accepted
  Blephariglotis ciliaris (L.) Rydb. – not accepted
  Blephariglotis psycodes (L.) Rydb. – not accepted
  Blephariglottis ciliaris (L.) Rydb. – not accepted
  Blephariglottis psycodes (L.) Rydb. – not accepted
  Chamomilla chamomilla (L.) Rydb. – not accepted
  Chamomilla maritima (L.) Rydb. – not accepted
  Cornella canadensis (L.) Rydb. – not accepted
  Cornella suecica (L.) Rydb. – not accepted
  Cullen americana (L.) Rydb. – not accepted – American scurfpea
  Cullen americanum (L.) Rydb. – accepted – American scurfpea
  Cyanococcus corymbosus (L.) Rydb. – not accepted
  Dasiphora fruticosa (L.) Rydb. – accepted – shrubby cinquefoil
  Erxlebenia minor (L.) Rydb. – not accepted
  Galarhoeus esula (L.) Rydb. – not accepted
  Galarhoeus peplus (L.) Rydb. – not accepted
  Galeorchis spectabilis (L.) Rydb. – not accepted
  Leucanthemum leucanthemum (L.) Rydb. – not accepted
  Leucocoma alpina (L.) Rydb. – not accepted
  Limnorchis hyperborea (L.) Rydb. – not accepted
  Moldavica thymiflora (L.) Rydb. – not accepted
  Pediomelum pentaphyllum (L.) Rydb. – accepted – small Indian breadroot, Chihuahua scurfpea
  Rubacer odoratum (L.) Rydb. – not accepted
  Rubacer odoratus (L.) Rydb. – not accepted
  Galarhoeus cyparissias (L.) Small ex Rydb. – not accepted
  Rubus randii (L.H. Bailey) Rydb. – not accepted
  Rubus roribaccus (L.H. Bailey) Rydb. – not accepted – Lucretia dewberry
  Perityle ciliata (L.H. Dewey) Rydb. – accepted – fringed rockdaisy, hairy rock-daisy
  Ramischia elatior (Lange) Rydb. – not accepted
  Crunocallis chamissoi (Ledeb. ex Spreng.) Rydb. – not accepted
  Alsine calycantha (Ledeb.) Rydb. – not accepted
  Chamaepericlymenum unalaschkense (Ledeb.) Rydb. – not accepted
  Potentilla robbinsiana (Lehm.) Oakes ex Rydb. – accepted – Robbins' cinquefoil, dwarf mountain cinquefoil
  Fragaria ovalis (Lehm.) Rydb. – not accepted
  Unamia lutescens (Lindl. ex DC.) Rydb. – not accepted
  Drymocallis glandulosa (Lindl.) Rydb. – accepted – sticky cinquefoil
  Drymocallis glandulosa var. glandulosa (Lindl.) Rydb. – accepted – sticky cinquefoil
  Habenaria stricta (Lindl.) Rydb. – not accepted
  Hoita orbicularis (Lindl.) Rydb. – accepted – roundleaf leather-root
  Limnorchis stricta (Lindl.) Rydb. – not accepted
  Piperia elegans (Lindl.) Rydb. – not accepted – elegant piperia
  Piperia elegans ssp. elegans (Lindl.) Rydb. – not accepted – elegant piperia
  Anthopogon tonsum (Lunell) Rydb. – not accepted
  Dracocephalum formosius (Lunell) Rydb. – not accepted
  Pilea fontana (Lunell) Rydb. – accepted – lesser clearweed
  Pilea opaca (Lunell) Rydb. – not accepted
  Liatris X fallacior (Lunell) Rydb. (pro sp.) – accepted – gayfeather
  Physalis viscosa var. maritima (M.A. Curtis) Rydb. – not accepted
  Astragalus scaphoides (M.E. Jones) Rydb. – accepted – bitterroot milkvetch
  Caulanthus glaber (M.E. Jones) Rydb. – not accepted
  Chorisiva nevadensis (M.E. Jones) Rydb. – accepted – Nevada sumpweed
  Comarella sabulosa (M.E. Jones) Rydb. – not accepted
  Ivesia campestris (M.E. Jones) Rydb. – accepted – field mousetail
  Orophaca aretioides (M.E. Jones) Rydb. – not accepted
  Perityle gracilis (M.E. Jones) Rydb. – accepted – three-lobed rockdaisy, grassleaf rockdaisy, grass-leaf rockdaisy, grasslike rockdaisy
  Thelypodiopsis elegans (M.E. Jones) Rydb. – accepted – Westwater tumble-mustard, Westwater tumblemustard
  Ranunculus siciformis Mack. & Bush ex Rydb. – not accepted
  Limnobotrya montigena (McClatchie) Rydb. – not accepted
  Aconogonon phytolaccifolium var. phytolaccifolium (Meisn. ex Small) Small ex Rydb. – accepted – poke knotweed
  Aconogonum phytolaccifolium (Meisn. ex Small) Small ex Rydb. – not accepted
  Gymnadeniopsis clavellata (Michx.) Rydb. – accepted – small green wood orchid
  Pediomelum canescens (Michx.) Rydb. – accepted – buckroot
  Physalis barbadensis var. obscura (Michx.) Rydb. – not accepted
  Rhytidomene lupinellus (Michx.) Rydb. – not accepted
  Swida stolonifera (Michx.) Rydb. – not accepted
  Orbexilum pedunculatum (Mill.) Rydb. – accepted – Sampson's snakeroot
  Orbexilum pedunculatum var. pedunculatum (Mill.) Rydb. – accepted – Sampson's snakeroot, babyroot scurfpea
  Swida foemina (Mill.) Rydb. – not accepted
  Chamaesyce greenei (Millsp.) Rydb. – not accepted
  Rubacer columbianum (Millsp.) Rydb. – not accepted
  Rubus columbianus (Millsp.) Rydb. – not accepted
  Sabina horizontalis (Moench) Rydb. – not accepted
  Sparganium multipedunculatum (Morong) Rydb. – not accepted
  Echinocereus roemeri (Muehlenpf.) Rydb. – not accepted
  Philotria angustifolia (Muhl.) Britton ex Rydb. – not accepted
  Leucocraspedum montanum (Mulford) Rydb. – not accepted
  Poa platyphylla Nash & Rydb. – not accepted
  Glyceria rigida (Nash) Rydb. – not accepted
  Panicularia rigida (Nash) Rydb. – not accepted
  Galarhoeus missouriensis (Norton) Rydb. – not accepted
  Tithymalus arkansanus var. coloradensis (Norton) Rydb. – not accepted
  Boisduvalia salicina (Nutt. ex Torr. & A. Gray) Rydb. – not accepted
  Orbexilum simplex (Nutt. ex Torr. & A. Gray) Rydb. – accepted – singlestem leather-root, simple scurfpea
  Petrophytum (Nutt. ex Torr. & A. Gray) Rydb. – accepted – rockspirea
  Psoralea tenuiflora var. floribunda (Nutt. ex Torr. & A. Gray) Rydb. – not accepted
  Psoralidium digitatum (Nutt. ex Torr. & A. Gray) Rydb. – not accepted
  Othake sphacelata (Nutt. ex Torr.) Rydb. – not accepted
  Acmispon americanum (Nutt.) Rydb. – not accepted
  Acmispon americanus (Nutt.) Rydb. – accepted – American bird's-foot trefoil
  Acmispon americanus var. americanus (Nutt.) Rydb. – accepted – American bird's-foot trefoil
  Agoseris glauca var. parviflora (Nutt.) Rydb. – not accepted
  Aphanes occidentalis (Nutt.) Rydb. – accepted
  Arabidopsis glauca (Nutt.) Rydb. – not accepted
  Atriplex subspicata (Nutt.) Rydb. – not accepted – halberdleaf orach, orach saltbush, spearscale, spreading orach, saline saltbush
  Berthelotia sericea (Nutt.) Rydb. – not accepted
  Chrysothamnus nauseosus var. albicaulis (Nutt.) Rydb. – not accepted
  Drymocallis fissa (Nutt.) Rydb. – accepted – bigflower cinquefoil
  Geoprumnon crassicarpum (Nutt.) Rydb. – not accepted
  Geoprumnon plattense (Nutt.) Rydb. – not accepted
  Gymnadeniopsis integra (Nutt.) Rydb. – accepted – yellow fringeless orchid
  Gymnadeniopsis nivea (Nutt.) Rydb. – accepted – snowy orchid
  Helenium pinnatifidum (Nutt.) Rydb. – accepted – southeastern sneezeweed
  Limnalsine diffusa (Nutt.) Rydb. – not accepted
  Lupinus stenophyllus (Nutt.) Rydb. – not accepted
  Montiastrum dichotomum (Nutt.) Rydb. – not accepted
  Myzorrhiza ludoviciana (Nutt.) Rydb. – not accepted
  Myzorrhiza multiflora (Nutt.) Rydb. – not accepted
  Oglifa californica (Nutt.) Rydb. – not accepted
  Orbexilum onobrychis (Nutt.) Rydb. – accepted – French-grass
  Orbexilum virgatum (Nutt.) Rydb. – accepted – pineland leather-root
  Pediomelum hypogaeum (Nutt.) Rydb. – accepted – subterranean Indian breadroot, scurfpea
  Pediomelum hypogaeum var. hypogaeum (Nutt.) Rydb. – accepted – subterranean Indian breadroot
  Petasites hookerianus (Nutt.) Rydb. – not accepted
  Petrophyton caespitosum (Nutt.) Rydb. – not accepted – mat rockspirea, tufted rockmat, rockspirea
  Petrophyton caespitosum var. caespitosum (Nutt.) Rydb. – not accepted – mat rockspirea, Rocky Mountain rockmat, Rocky Mountain rockspirea
  Petrophytum caespitosum (Nutt.) Rydb. – accepted – mat rockspirea
  Petrophytum caespitosum ssp. caespitosum (Nutt.) Rydb. – accepted – rock spiraea
  Petrophytum caespitosum var. caespitosum (Nutt.) Rydb. – not accepted – mat rockspirea
  Pleiacanthus spinosus (Nutt.) Rydb. – accepted – thorn skeletonweed
  Ranunculus raninculinus (Nutt.) Rydb. – not accepted
  Ranunculus ranunculinus (Nutt.) Rydb. – accepted – tadpole buttercup
  Rubacer parviflorum (Nutt.) Rydb. – not accepted
  Rubacer parviflorus (Nutt.) Rydb. – not accepted
  Sphaeralcea coccinea (Nutt.) Rydb. – accepted – copper mallow, red falsemallow, orange globemallow, scarlet globemallow
  Sphaeralcea coccinea ssp. coccinea (Nutt.) Rydb. – not accepted
  Sphaeralcea coccinea var. coccinea (Nutt.) Rydb. – accepted – scarlet globemallow
  Toxicoscordion paniculatum (Nutt.) Rydb. – accepted – foothill deathcamas
  Unamia alba (Nutt.) Rydb. – not accepted
  Vulpia megalura (Nutt.) Rydb. – not accepted
  Xylophacos argophyllus (Nutt.) Rydb. – not accepted
  Xylophacos missouriensis (Nutt.) Rydb. – not accepted
  Picradeniopsis oppositifolia (Nutt.) Rydb. ex Britton – accepted – oppositeleaf bahia, opposite-leaf false bahia, plains bahia
  Dentaria rupicola (O.E. Schulz) Rydb. – not accepted
  Sophia richardsonii (O.E. Schulz) Rydb. – not accepted
  Dasystephana glauca (Pall.) Rydb. – not accepted
  Calyptridium pygmaeum Parish ex Rydb. – not accepted
  Cistanthe pygmaea (Parish ex Rydb.) Hershk. – accepted – pygmy pussypaws
  Thalesia lutea (Parry) Rydb. – not accepted
  Thelypodiopsis juniperorum (Payson) Rydb. – accepted – juniper tumblemustard
  Penstemon virens Pennell ex Rydb. – accepted – Front Range beardtongue
  Limnobotrya lacustris (Pers.) Rydb. – not accepted
  Syntherisma humifusum (Pers.) Rydb. – not accepted
  Chamaerhodos nuttallii Pickering ex Rydb. – not accepted
  Chamaerhodos erecta ssp. nuttallii (Pickering ex Rydb.) Hultén – not accepted – chamaerhodos, little-rose, Nuttall's little rose
  Festuca calligera (Piper) Rydb. – accepted – southwest fescue
  Grindelia columbiana (Piper) Rydb. – not accepted – Columbia River gumweed
  Hesperochloa (Piper) Rydb. – not accepted
  Ophrys caurina (Piper) Rydb. – not accepted
  Ozomelis anomala (Piper) Rydb. – not accepted
  Ozomelis micrantha (Piper) Rydb. – not accepted
  Ozomelis stauropetala (Piper) Rydb. – not accepted
  Petrophyton cinerascens (Piper) Rydb. – not accepted – halfshrub rockmat
  Petrophytum cinerascens (Piper) Rydb. – accepted – halfshrub rockmat, chelan rockmat
  Vulpia pacifica (Piper) Rydb. – not accepted
  Guaiacum guatemalense Planch. ex Rydb. – not accepted
  Philotria nuttallii (Planch.) Rydb. – not accepted
  Echinochloa pungens (Poir.) Rydb. – not accepted
  Echinochloa pungens var. pungens (Poir.) Rydb. – not accepted
  Rydbergia brandegeei (Porter ex A. Gray) Rydb. – not accepted
  Alsine americana (Porter ex B.L. Rob.) Rydb. – not accepted
  Penstemon brandegeei (Porter) Rydb. – not accepted
  Solidago pallida (Porter) Rydb. – not accepted
  Viorna scottii (Porter) Rydb. – not accepted
  Anticlea elegans (Pursh) Rydb. – accepted – mountain deathcamas
  Anticlea elegans var. elegans (Pursh) Rydb. – accepted – mountain deathcamas
  Astragalus longifolius (Pursh) Rydb. – not accepted
  Chamomilla suaveolens (Pursh) Rydb. – not accepted
  Chrysobotrya aurea (Pursh) Rydb. – not accepted
  Drymocallis agrimonioides (Pursh) Rydb. – not accepted
  Drymocallis arguta (Pursh) Rydb. – accepted – tall cinquefoil
  Limnorchis dilatata (Pursh) Rydb. – not accepted
  Lysias orbiculata (Pursh) Rydb. – not accepted
  Microphacos parviflorus (Pursh) Rydb. – not accepted
  Ochrocodon pudicus (Pursh) Rydb. – not accepted
  Odostemon aquifolium (Pursh) Rydb. – not accepted
  Odostemon nervosus (Pursh) Rydb. – not accepted
  Pediomelum cuspidatum (Pursh) Rydb. – accepted – largebract Indian breadroot, tallbread scurfpea
  Pediomelum esculentum (Pursh) Rydb. – accepted – large Indian breadroot, Indian breadroot, breadroot scurfpea
  Psoralidium argophyllum (Pursh) Rydb. – not accepted
  Psoralidium lanceolatum (Pursh) Rydb. – accepted – lemon scurfpea, wild lemonweed, dune scurfpea
  Psoralidium tenuiflorum (Pursh) Rydb. – accepted – slimflower scurfpea, scurfpea
  Sericotheca discolor (Pursh) Rydb. – not accepted
  Sidopsis hispida (Pursh) Rydb. – not accepted
  Sieversia peckii (Pursh) Rydb. – not accepted
  Taraxia subacaulis (Pursh) Rydb. – accepted – diffuseflower evening primrose
  Galarhoeus obtusatus (Pursh) Small ex Rydb. – not accepted
  Sideranthus spinulosus (Pursh) Sweet ex Rydb. – not accepted
  Alsinopsis rossii (R. Br. ex Richardson) Rydb. – not accepted
  Petasites corymbosus (R. Br.) Rydb. – not accepted
  Sesban exaltatus (Raf.) Rydb. – not accepted
  Sesbania exaltata (Raf.) Rydb. ex A.W. Hill – not accepted – bigpod sesbania, hemp sesbania
  Elymus jejunus (Ramaley) Rydb. – not accepted
  Alnus sinuata (Regel) Rydb. – not accepted
  Elephantella groenlandica (Retz.) Rydb. – not accepted
  Alsine stricta (Richardson) Rydb. – not accepted
  Anticlea chlorantha (Richardson) Rydb. – not accepted
  Atelophragma aboriginorum (Richardson) Rydb. – not accepted
  Geoprumnon succulentum (Richardson) Rydb. – not accepted
  Lesquerella arenosa (Richardson) Rydb. – not accepted – Great Plains bladderpod
  Lesquerella arenosa var. arenosa (Richardson) Rydb. – not accepted – Great Plains bladderpod
  Sophia brachycarpa (Richardson) Rydb. – not accepted
  Physalis carpenteri Riddell ex Rydb. – accepted – Carpenter's groundcherry
  Eriocoma hymenoides (Roem. & Schult.) Rydb. – not accepted
  Astragalus newberryi var. blyae (Rose ex Rydb.) Barneby – accepted – Newberry's milkvetch, Bly milkvetch
  Astragalus blyae (Rose ex Rydb.) Tidestr. – not accepted
  Orbexilum macrophyllum (Rowlee ex Small) Rydb. – accepted – largeleaf leather-root, bigleaf scurfpea
  Salix wheeleri (Rowlee) Rydb. – not accepted
  Abronia pumila Rydb. – not accepted
  Abronia salsa Rydb. – not accepted
  Achillea angustissima Rydb. – not accepted
  Achillea fusca Rydb. – not accepted
  Achillea lanulosa var. alpicola Rydb. – not accepted
  Achillea pacifica Rydb. – not accepted
  Achillea puberula Rydb. – not accepted
  Acrolasia gracilis Rydb. – not accepted
  Agoseris rostrata Rydb. – not accepted
  Agoseris turbinata Rydb. – not accepted
  Agropyron smithii Rydb. – not accepted
  Agropyron smithii var. smithii Rydb. – not accepted
  Agrostis atrata Rydb. – not accepted
  Agrostis bakeri Rydb. – not accepted
  Agrostis reptans Rydb. – not accepted
  Agrostis variabilis Rydb. – accepted – mountain bentgrass, mountain redtop
  Aira vaseyana Rydb. – not accepted
  Allionia bracteata Rydb. – not accepted
  Allium aridum Rydb. – not accepted
  Allium macropetalum Rydb. – accepted – largeflower wild onion, largeflower onion
  Allium natans Rydb. – not accepted
  Allium neomexicanum Rydb. – not accepted
  Allium recurvatum Rydb. – not accepted
  Alsine palmeri Rydb. – not accepted
  Alsinopsis obtusiloba Rydb. – not accepted
  Amauriopsis Rydb. – accepted
  Ambrosia californica Rydb. – not accepted
  Ambrosia rugelii Rydb. – not accepted
  Amorpha bushii Rydb. – not accepted
  Amorpha crenulata Rydb. – not accepted – crenulate lead-plant
  Amorpha curtissii Rydb. – not accepted
  Amorpha floridana Rydb. – not accepted
  Amsinckia rugosa Rydb. – not accepted
  Amsonia eastwoodiana Rydb. – not accepted – Eastwood's bluestar
  Androsace puberulenta Rydb. – not accepted
  Anemone lithophila Rydb. – not accepted – Little Belt Mountain thimbleweed
  Anemone tuberosa Rydb. – accepted – desert windflower, tuber anemone
  Anemone tuberosa var. tuberosa Rydb. – not accepted – tuber anemone
  Antennaria acuta Rydb. – not accepted
  Antennaria acuta Rydb. – not accepted
  Antennaria anaphaloides Rydb. – accepted – pearly pussytoes, pussytoes, tall everlasting
  Antennaria angustifolia Rydb. – not accepted
  Antennaria bracteosa Rydb. – not accepted
  Antennaria campestris Rydb. – not accepted
  Antennaria caroliniana Rydb. – not accepted
  Antennaria flavescens Rydb. – not accepted
  Antennaria foliacea var. humilis Rydb. – not accepted
  Antennaria microphylla Rydb. – accepted – littleleaf pussytoes, Rocky Mountain pussytoes, smallleaf pussytoes, small leaf everlasting
  Antennaria oblanceolata Rydb. – not accepted
  Antennaria piperi Rydb. – not accepted
  Antennaria rosulata Rydb. – accepted – Kaibab pussytoes
  Antennaria sierrae-blancae Rydb. – not accepted
  Antennaria solitaria Rydb. – accepted – singlehead pussytoes
  Antennaria umbrinella Rydb. – accepted – umber pussytoes, brown everlasting
  Antheropeas Rydb. – accepted – easterbonnets, easter-bonnets
  Anticlea vaginata Rydb. – accepted – sheathed deathcamas
  Aphanes australis Rydb. – accepted
  Aquilegia saximontana Rydb. – accepted – Rocky Mountain blue columbine
  Arabis bourgovii Rydb. – not accepted
  Arabis macdougalii Rydb. – not accepted
  Arabis mcdougalii Rydb. – not accepted
  Arabis selbyi Rydb. – not accepted – Selby's rockcress
  Aragallus argophyllus Rydb. – not accepted
  Aragallus atropurpureus Rydb. – not accepted
  Aragallus besseyi Rydb. – not accepted
  Aragallus viscidulus Rydb. – not accepted
  Aragallus viscidulus var. depressus Rydb. – not accepted
  Arenaria confusa Rydb. – not accepted
  Arenaria eastwoodiae Rydb. – not accepted – Eastwood's sandwort
  Arenaria eastwoodiae var. eastwoodiae Rydb. – not accepted – Eastwood's sandwort
  Arenaria fendleri var. porteri Rydb. – not accepted – Porter's sandwort
  Arenaria lithophila Rydb. – not accepted
  Argemone rotundata Rydb. – not accepted
  Argentina occidentalis Rydb. – not accepted
  Argentina subarctica Rydb. – not accepted
  Arnica amplexifolia Rydb. – not accepted
  Arnica chandleri Rydb. – not accepted
  Arnica cusickii Rydb. – not accepted
  Arnica gracilis Rydb. – accepted – smallhead arnica
  Arnica humilis Rydb. – not accepted
  Artemisia alaskana Rydb. – accepted – Alaska wormwood
  Artemisia angusta Rydb. – not accepted
  Artemisia camporum Rydb. – not accepted
  Artemisia candicans Rydb. – not accepted
  Artemisia comata Rydb. – not accepted
  Artemisia diversifolia Rydb. – not accepted
  Artemisia gormanii Rydb. – not accepted
  Artemisia herriotii Rydb. – not accepted
  Artemisia hyperborea Rydb. – not accepted
  Artemisia ripicola Rydb. – not accepted
  Artemisia sulcata Rydb. – not accepted
  Artemisia tacomensis Rydb. – not accepted
  Artemisia tripartita Rydb. – accepted – threetip sagebrush
  Artemisia tripartita ssp. tripartita Rydb. – accepted – Idaho threetip sagebrush, threetip sagebrush
  Artemisia tyrellii Rydb. – not accepted
  Artemisia unalaskensis Rydb. – not accepted
  Artemisia vaseyana Rydb. – not accepted
  Aruncus acuminatus Rydb. – not accepted
  Aruncus allegheniensis Rydb. – not accepted
  Aruncus pubescens Rydb. – not accepted
  Aster batesii Rydb. – not accepted
  Aster crassulus Rydb. – not accepted
  Aster exiguus Rydb. – not accepted
  Aster finkii Rydb. – not accepted
  Aster franklinianus Rydb. – not accepted
  Aster junciformis Rydb. – not accepted
  Aster juniperinus Rydb. – not accepted
  Aster maccallae Rydb. – not accepted
  Aster maccallii Rydb. – not accepted
  Aster macounii Rydb. – not accepted
  Aster mearnsii Rydb. – not accepted
  Aster mollis Rydb. – not accepted – soft aster
  Aster osterhoutii Rydb. – not accepted
  Aster phyllodes Rydb. – not accepted
  Aster polycephalus Rydb. – not accepted
  Aster subgriseus Rydb. – not accepted
  Aster tweedyi Rydb. – not accepted
  Aster wilsonii Rydb. – not accepted
  Aster woldenii Rydb. – not accepted
  Astragalus halei Rydb. – not accepted
  Astragalus macounii Rydb. – not accepted
  Astragalus niveus Rydb. – not accepted
  Astragalus pachystachys Rydb. – not accepted
  Astragalus sulphurescens Rydb. – not accepted
  Astragalus williamsii Rydb. – accepted – Williams' milkvetch
  Atelophragma alpiniforme Rydb. – not accepted
  Atelophragma harringtonii Rydb. – not accepted
  Atriplex buxifolia Rydb. – not accepted
  Atriplex garrettii Rydb. – accepted – Garrett's saltbush
  Atriplex garrettii var. garrettii Rydb. – accepted – Garrett's saltbush
  Atriplex subconferta Rydb. – not accepted
  Barbarea americana Rydb. – not accepted
  Besseya Rydb. – not accepted – kittentail
  Blitum hastatum Rydb. – not accepted
  Bromus flodmanii Rydb. – not accepted
  Campanula uliginosa Rydb. – not accepted
  Capnoides brachycarpum Rydb. – not accepted
  Capnoides hastatum Rydb. – not accepted
  Cardamine unijuga Rydb. – not accepted
  Carduus coloradensis Rydb. – not accepted
  Carduus tracyi Rydb. – not accepted
  Carex ebenea Rydb. – accepted – ebony sedge
  Carex praticola Rydb. – accepted – northern meadow sedge, meadow sedge
  Carex pseudoscirpoidea Rydb. – not accepted – western singlespike sedge
  Castilleja crista-galli Rydb. – accepted – mountainside Indian paintbrush
  Castilleja gracillima Rydb. – not accepted
  Castilleja leonardii Rydb. – not accepted
  Castilleja linearis Rydb. – not accepted
  Castilleja luteovirens Rydb. – not accepted
  Castilleja parvula Rydb. – accepted – Tushar Plateau Indian paintbrush, Tushar Indian paintbrush
  Castilleja puberula Rydb. – accepted – shortflower Indian paintbrush
  Castilleja pulchella Rydb. – accepted – beautiful Indian paintbrush
  Castilleja rhexiifolia Rydb. – accepted – splitleaf Indian paintbrush, rhexialeaf paintbrush
  Castilleja sulphurea Rydb. – accepted – sulphur Indian paintbrush
  Castilleja viscida Rydb. – not accepted
  Ceanothus subsericeus Rydb. – not accepted
  Cerastium earlei Rydb. – not accepted
  Cerastium graminifolium Rydb. – not accepted
  Cerastium pulchellum Rydb. – not accepted
  Cerastium thermale Rydb. – not accepted
  Cercocarpus alnifolius Rydb. – not accepted
  Cercocarpus argenteus Rydb. – not accepted
  Cercocarpus douglasii Rydb. – not accepted
  Cercocarpus hypoleucus Rydb. – not accepted
  Cercocarpus macrourus Rydb. – not accepted
  Cercocarpus rotundifolius Rydb. – not accepted
  Chaenactis humilis Rydb. – not accepted
  Chaenactis rubricaulis Rydb. – not accepted
  Chamaechaenactis Rydb. – accepted – chamaechaenactis
  Chamaesaracha crenata Rydb. – accepted – toothed five eyes
  Chamaesaracha villosa Rydb. – accepted – Trans-Pecos five eyes
  Chenopodium atrovirens Rydb. – accepted – dark goosefoot, pinyon goosefoot
  Chenopodium pratericola Rydb. – accepted – desert goosefoot
  Chenopodium wolfii Rydb. – not accepted
  Chimaphila occidentalis Rydb. – not accepted
  Chlorocrambe Rydb. – accepted
  Chorisiva Rydb. – accepted
  Chrysopsis alpicola Rydb. – not accepted
  Chrysopsis amplifolia Rydb. – not accepted
  Chrysopsis angustifolia Rydb. – not accepted
  Chrysopsis ballardii Rydb. – not accepted
  Chrysopsis barbata Rydb. – not accepted
  Chrysopsis butleri Rydb. – not accepted
  Chrysopsis caudata Rydb. – not accepted
  Chrysopsis depressa Rydb. – not accepted
  Chrysopsis horrida Rydb. – not accepted
  Chrysosplenium iowense Rydb. – accepted – Iowa golden saxifrage
  Cirsium araneans Rydb. – not accepted – jeweled thistle
  Cirsium engelmannii Rydb. – accepted – Engelmann's thistle
  Cirsium humboldtense Rydb. – not accepted – Humboldt County thistle
  Cirsium lactucinum Rydb. – not accepted
  Cirsium spathulifolium Rydb. – not accepted
  Cirsium subniveum Rydb. – not accepted – Jackson Hole thistle, gray thistle
  Claytonia bellidifolia Rydb. – not accepted
  Claytonia multiscapa Rydb. – accepted – lanceleaf springbeauty
  Claytonia multiscapa ssp. multiscapa Rydb. – accepted – lanceleaf springbeauty
  Claytonia rosea Rydb. – accepted – western springbeauty
  Cleomella cornuta Rydb. – not accepted
  Cnemidophacos knowlesianus Rydb. – not accepted
  Cnicus drummondii var. acaulescens Rydb. – not accepted
  Collinsia parvula Rydb. – not accepted
  Conimitella Rydb. – accepted
  Corallorhiza ochroleuca Rydb. – not accepted
  Corallorrhiza ochroleuca Rydb. – not accepted
  Coriospermum villosum Rydb. – not accepted
  Corispermum emarginatum Rydb. – not accepted
  Corispermum marginale Rydb. – not accepted
  Corispermum villosum Rydb. – accepted – hairy bugseed
  Cracca carpenteri Rydb. – not accepted
  Cracca mohrii Rydb. – not accepted
  Cracca texana Rydb. – not accepted
  Cracca thurberi Rydb. – not accepted
  Crepis glaucella Rydb. – not accepted
  Crepis perplexans Rydb. – not accepted
  Cryptantha grandiflora Rydb. – not accepted
  Cryptantha minima Rydb. – accepted – small cryptantha, little catseye, little cryptantha
  Cuscuta megalocarpa Rydb. – not accepted – big-fruit dodder, bigfruit dodder
  Daubentonia drummondii Rydb. – not accepted
  Delphinium albescens Rydb. – not accepted
  Delphinium alpestre Rydb. – accepted – Colorado larkspur
  Delphinium brownii Rydb. – not accepted
  Delphinium diversicolor Rydb. – not accepted
  Delphinium geraniifolium Rydb. – accepted – Clark Valley larkspur
  Delphinium glaucescens Rydb. – accepted – glaucus larkspur, smooth larkspur
  Delphinium glaucesens Rydb. – not accepted
  Delphinium ramosum Rydb. – accepted – mountain larkspur
  Delphinium robustum Rydb. – accepted – Wahatoya Creek larkspur
  Delphinium wootonii Rydb. – accepted – Organ Mountain larkspur
  Delphinium X diversicolor Rydb. – accepted
  Delphinium xylorrhizum Rydb. – not accepted – larkspur
  Deschampsia alpicola Rydb. – not accepted
  Deschampsia pungens Rydb. – not accepted
  Dicoria oblongifolia Rydb. – not accepted
  Distichlis dentata Rydb. – not accepted
  Dodecatheon cylindrocarpum Rydb. – not accepted
  Draba argyraea Rydb. – not accepted
  Draba argyrea Rydb. – accepted – silver draba
  Draba brachystylis Rydb. – accepted – shortstyle draba, Wasatch draba
  Draba cana Rydb. – accepted – cushion draba
  Draba crassa Rydb. – accepted – thickleaf draba
  Draba lonchocarpa Rydb. – accepted – lancepod draba
  Draba lonchocarpa var. lonchocarpa Rydb. – not accepted – lancepod draba
  Draba mccallae Rydb. – not accepted
  Draba parryi Rydb. – not accepted
  Draba sobolifera Rydb. – accepted – stolon draba, stolon whitlowgrass
  Drymocallis arizonica Rydb. – accepted – Arizona cinquefoil
  Drymocallis cuneifolia Rydb. – accepted
  Drymocallis cuneifolia var. cuneifolia Rydb. – accepted
  Drymocallis glabrata Rydb. – accepted – Idaho drymocallis
  Drymocallis micropetala Rydb. – accepted – smallpetal cinquefoil
  Dugaldia grandiflora Rydb. – not accepted
  Eatonia intermedia Rydb. – not accepted
  Echinocactus subglacus Rydb. – not accepted
  Echinocactus subglaucus Rydb. – not accepted
  Elatine rubella Rydb. – accepted – southwestern waterwort
  Eleocharis thermalis Rydb. – not accepted
  Elmera Rydb. – accepted – coralbells
  Elymus marginalis Rydb. – not accepted
  Elymus petersonii Rydb. – not accepted
  Elymus strigosus Rydb. – not accepted
  Elymus villiflorus Rydb. – not accepted
  Elymus vulpinus Rydb. – not accepted – Rydberg's wildrye
  Epilobium platyphyllum Rydb. – not accepted
  Erigeron conspicuus Rydb. – not accepted
  Erigeron evermannii Rydb. – accepted – Evermann's fleabane
  Erigeron flabellifolius Rydb. – accepted – fanleaf fleabane
  Erigeron gracilis Rydb. – accepted – quill fleabane
  Erigeron mancus Rydb. – accepted – depauperate fleabane
  Erigeron nematophyllus Rydb. – accepted – needleleaf fleabane
  Erigeron oblanceolatus Rydb. – not accepted
  Erigeron vetensis Rydb. – accepted – early bluetop fleabane
  Erigeron viscidus Rydb. – not accepted
  Erigeron wyomingia Rydb. – not accepted
  Erigeron yukonensis Rydb. – accepted – Yukon fleabane
  Eriogonum brandegeei Rydb. – accepted – Brandegee's buckwheat, Brandegee's wild buckwheat
  Eriogonum chrysops Rydb. – accepted – bitterroot buckwheat, golden buckwheat
  Eriogonum clutei Rydb. – not accepted
  Eriogonum lagopus Rydb. – not accepted – parasol buckwheat
  Eriogonum mancum Rydb. – accepted – imperfect buckwheat
  Eriogonum nebraskense Rydb. – not accepted
  Eriogonum spathuiforme Rydb. – not accepted
  Eriophyllum latilobum Rydb. – accepted – San Mateo woolly sunflower
  Erysimum angustatum Rydb. – not accepted – Contra Costa wallflower, Dawson wallflower
  Eupatorium holzingeri Rydb. – not accepted
  Euphorbia albicaulis Rydb. – not accepted
  Euthamia glutinosa Rydb. – not accepted
  Fagonia pachyacantha Rydb. – accepted – sticky fagonia, sticky fagonbush
  Festuca campestris Rydb. – accepted – rough fescue
  Festuca earlei Rydb. – accepted – Earle's fescue
  Festuca minutiflora Rydb. – accepted – smallflower fescue, small-flower fescue
  Festuca saximontana Rydb. – accepted – Rocky Mountain fescue, mountain fescue
  Festuca saximontana ssp. saximontana Rydb. – not accepted
  Festuca saximontana var. saximontana Rydb. – accepted – Rocky Mountain fescue
  Festuca vallicola Rydb. – not accepted
  Floerkea occidentalis Rydb. – not accepted
  Fragaria californica var. franciscana Rydb. – not accepted
  Fragaria crinita Rydb. – not accepted – Pacific strawberry
  Fragaria pauciflora Rydb. – not accepted
  Fragaria platypetala Rydb. – not accepted
  Fragaria sibbaldifolia Rydb. – not accepted
  Fragaria suksdorfii Rydb. – not accepted
  Fragaria truncata Rydb. – not accepted
  Fragaria virginiana var. australis Rydb. – not accepted
  Franseria linearis Rydb. – not accepted
  Franseria strigulosa Rydb. – not accepted
  Frasera speciosa var. angustifolia Rydb. – not accepted
  Frasera speciosa var. stenosepala Rydb. – not accepted
  Gaillardia flava Rydb. – accepted – yellow blanketflower
  Gaillardia mearnsii Rydb. – not accepted
  Gaillardia pringlei Rydb. – not accepted
  Gaillardia villosa Rydb. – not accepted
  Galium boreale var. linearifolium Rydb. – not accepted
  Galium columbianum Rydb. – not accepted
  Galium filipes Rydb. – not accepted – slenderstalk bedstraw
  Gayophytum helleri Rydb. – not accepted
  Gayophytum intermedium Rydb. – not accepted
  Geranium canum Rydb. – not accepted
  Geranium cowenii Rydb. – not accepted
  Geranium nervosum Rydb. – not accepted
  Geranium strigosum Rydb. – not accepted
  Geum camporum Rydb. – not accepted
  Geum decurrens Rydb. – not accepted
  Geum perincisum Rydb. – not accepted
  Geum turbinatum Rydb. – not accepted
  Gilia candida Rydb. – not accepted
  Gilia cephaloidea Rydb. – not accepted
  Gilia frutescens Rydb. – not accepted
  Gilia hutchinsifolia Rydb. – not accepted – desert pale gily-flower, Hutchin's gilia, desert pale gilia
  Gilia parvula Rydb. – not accepted
  Gilia polyantha Rydb. – not accepted
  Gilia roseata Rydb. – not accepted
  Gilia subacaulis Rydb. – not accepted – pinyon gilia
  Gilia tenuituba Rydb. – not accepted
  Gilia tridactyla Rydb. – not accepted
  Gilia tweedyi Rydb. – accepted – Tweedy's gilia
  Grindelia aphanactis Rydb. – not accepted
  Grindelia laciniata Rydb. – not accepted – cutleaf gumweed, cut-leaf gumweed
  Grindelia serrulata Rydb. – not accepted
  Gutierrezia linearis Rydb. – not accepted
  Gymnadeniopsis Rydb. – accepted
  Hedeoma campora Rydb. – not accepted
  Hedeoma longiflora Rydb. – not accepted
  Hedysarum cinerascens Rydb. – not accepted
  Hedysarum sulphurescens Rydb. – accepted – white sweetvetch
  Hedysarum utahense Rydb. – not accepted
  Helenium linifolium Rydb. – accepted – slimleaf sneezeweed
  Helenium macranthum Rydb. – not accepted
  Helianthus aridus Rydb. – not accepted
  Helianthus subrhomboideus Rydb. – not accepted
  Heliotropium spathulatum Rydb. – not accepted
  Heuchera abramsii Rydb. – accepted – San Gabriel alumroot
  Heuchera aceroides Rydb. – not accepted
  Heuchera alba Rydb. – accepted – white alumroot
  Heuchera arkansana Rydb. – not accepted
  Heuchera crinita Rydb. – not accepted
  Heuchera curtisii var. crenata Rydb. – not accepted
  Heuchera diversifolia Rydb. – not accepted
  Heuchera flabellifolia Rydb. – not accepted – montane alumroot, Bridger Mountain alumroot
  Heuchera flabellifolia var. flabellifolia Rydb. – not accepted – Bridger Mountain alumroot
  Heuchera grossulariifolia Rydb. – accepted – gooseberryleaf alumroot
  Heuchera grossulariifolia var. grossulariifolia Rydb. – not accepted – gooseberryleaf alumroot
  Heuchera lancipetala Rydb. – not accepted
  Heuchera longiflora Rydb. – accepted – longflower alumroot, goldeneye
  Heuchera parishii Rydb. – accepted – Mill Creek alumroot
  Heuchera pringlei Rydb. – not accepted
  Heuchera scabra Rydb. – not accepted
  Heuchera suksdorfii Rydb. – not accepted
  Heuchera wootonii Rydb. – accepted – White Mountain alumroot
  Hieracium columbianum Rydb. – not accepted
  Hoita Rydb. – accepted – leather-root
  Hoita hallii Rydb. – not accepted
  Hoita longiloba Rydb. – not accepted
  Hoita rhomboidea Rydb. – not accepted
  Holodiscus microphyllus Rydb. – accepted
  Holodiscus microphyllus var. microphyllus Rydb. – accepted – rock spiraea
  Horckelia scandularis Rydb. – not accepted
  Horkelia argyrocoma Rydb. – not accepted
  Horkelia bernardiana Rydb. – not accepted
  Horkelia brownii Rydb. – not accepted
  Horkelia congdonis Rydb. – not accepted
  Horkelia flavescens Rydb. – not accepted
  Horkelia gordonii var. megalopetala Rydb. – not accepted
  Horkelia hispidula Rydb. – accepted – White Mountain horkelia
  Horkelia puberula Rydb. – not accepted
  Horkelia sericoleuca Rydb. – not accepted
  Horkelia truncata Rydb. – accepted – Ramona horkelia
  Hulsea carnosa Rydb. – not accepted
  Hulsea mexicana Rydb. – accepted – Mexican alpinegold
  Hymenoclea pentalepis Rydb. – not accepted
  Hymenopappus cinereus Rydb. – not accepted
  Hymenoxys quinquesquamata Rydb. – accepted – rincon rubberweed
  Hypericum mitchellianum Rydb. – not accepted – Blue Ridge St. Johnswort
  Hypopitys latisquama Rydb. – not accepted
  Impatiens aurella Rydb. – accepted – paleyellow touch-me-not
  Impatiens nortonii Rydb. – not accepted
  Impatiens occidentalis Rydb. – not accepted
  Isopappus validus Rydb. – not accepted
  Ivesia tweedyi Rydb. – accepted – Tweedy's ivesia
  Juncus ater Rydb. – not accepted
  Juncus balticus var. vallicola Rydb. – not accepted – valley rush
  Juncus jonesii Rydb. – not accepted
  Juncus tracyi Rydb. – not accepted – Tracy rush, Tracy's rush
  Juncus tweedyi Rydb. – not accepted – Tweedy rush, Tweedy's rush
  Kallstroemia caribaea Rydb. – not accepted
  Kallstroemia intermedia Rydb. – not accepted
  Kelseya Rydb. – accepted
  Kneiffia latifolia Rydb. – not accepted
  Kuhnistera adenopoda Rydb. – not accepted
  Laphamia rotundata Rydb. – not accepted
  Lathyrus brachycalyx Rydb. – accepted – Bonneville pea, Bonneville vetchling, Bonneville peavine, Rydberg's peavine
  Lathyrus brachycalyx ssp. brachycalyx Rydb. – not accepted – Bonneville pea, Bonneville peavine
  Lathyrus brachycalyx var. brachycalyx Rydb. – accepted – Bonneville pea
  Lathyrus leucanthus Rydb. – not accepted
  Lathyrus schaffneri Rydb. – not accepted
  Lepidium elongatum Rydb. – not accepted
  Lepidium jonesii Rydb. – not accepted
  Lesquerella ovalifolia Rydb. – not accepted – ovalleaf bladderpod, roundleaf bladderpod
  Lesquerella ovalifolia ssp. ovalifolia Rydb. – not accepted – roundleaf bladderpod
  Lesquerella spathulata Rydb. – not accepted
  Lesquerella spatulata Rydb. – not accepted
  Lesquerella utahensis Rydb. – not accepted – Utah bladderpod
  Leuciva Rydb. – accepted
  Leucophysalis Rydb. – accepted
  Lewisia disepala Rydb. – accepted – Yosemite bitterroot, Yosemite lewisia
  Lewisia minor Rydb. – not accepted
  Liatris bebbiana Rydb. – not accepted
  Liatris glabrata Rydb. – not accepted
  Liatris hirsuta Rydb. – accepted – scaly blazing star
  Limnia utahensis Rydb. – not accepted
  Limnorchis ensifolia Rydb. – not accepted
  Limnorchis graminifolia Rydb. – not accepted
  Limnorchis media Rydb. – not accepted
  Limnorchis purpurascens Rydb. – not accepted
  Listera nephrophylla Rydb. – not accepted
  Lithophragma australe Rydb. – not accepted
  Lithophragma brevilobum Rydb. – not accepted
  Lithophragma bulbiferum Rydb. – not accepted
  Lobelia kalmii var. strictiflora Rydb. – not accepted
  Lotus longebracteatus Rydb. – not accepted
  Lupinus adscendens Rydb. – not accepted
  Lupinus argentinus Rydb. – not accepted
  Lupinus candicans Rydb. – not accepted
  Lupinus comatus Rydb. – not accepted
  Lupinus cyaneus Rydb. – not accepted
  Lupinus depressus Rydb. – accepted – depressed lupine
  Lupinus evermannii Rydb. – accepted – Evermann's lupine
  Lupinus flavescens Rydb. – not accepted
  Lupinus flavicaulis Rydb. – not accepted
  Lupinus jonesii Rydb. – accepted – Jones' lupine
  Lupinus laxispicatus Rydb. – not accepted
  Lupinus laxus Rydb. – not accepted
  Lupinus leucanthus Rydb. – not accepted
  Lupinus lupinus Rydb. – not accepted
  Lupinus macounii Rydb. – not accepted
  Lupinus macrostachys Rydb. – not accepted
  Lupinus maculatus Rydb. – accepted – spotted lupine
  Lupinus marianus Rydb. – not accepted
  Lupinus monticola Rydb. – accepted – mountain lupine
  Lupinus pulcherrimus Rydb. – not accepted
  Lupinus roseolus Rydb. – accepted – rosy lupine
  Lupinus rubens Rydb. – not accepted
  Lupinus scaposus Rydb. – not accepted
  Lupinus scheuberae Rydb. – not accepted
  Lupinus spathulatus Rydb. – not accepted
  Lupinus subulatus Rydb. – not accepted
  Lycopus velutinus Rydb. – not accepted
  Machaeranthera fremontii Rydb. – not accepted
  Machaeranthera leptophylla Rydb. – not accepted
  Machaeranthera rubricaulis Rydb. – not accepted
  Machaeranthera selbyi Rydb. – not accepted
  Macronema lineare Rydb. – not accepted
  Margaranthus purpurascens Rydb. – not accepted
  Meriolix oblanceolata Rydb. – not accepted
  Mertensia humilis Rydb. – accepted – Rocky Mountain bluebells
  Mertensia perplexa Rydb. – not accepted
  Mimulus eastwoodiae Rydb. – accepted – Eastwood's monkey-flower, crimson monkeyflower, Eastwood's monkeyflower
  Mimulus gratioloides Rydb. – not accepted
  Mitella oppositifolia Rydb. – not accepted
  Mitella violacea Rydb. – not accepted
  Montia funstonii Rydb. – not accepted
  Muhlenbergia aristulata Rydb. – not accepted
  Musineon vaginatum Rydb. – accepted – sheathed wildparsley
  Myzorrhiza corymbosa Rydb. – not accepted
  Oenothera longissima Rydb. – accepted – longstem evening-primrose, longstem eveningprimrose, longstem evening primrose
  Oenothera longissima var. longissima Rydb. – not accepted
  Oligoneuron canescens Rydb. – not accepted
  Opulaster alabamensis Rydb. – not accepted
  Opulaster australis Rydb. – not accepted
  Opulaster intermedius Rydb. – not accepted
  Opulaster stellatus Rydb. – not accepted
  Oreobatus Rydb. – not accepted
  Oreocarya pustulosa Rydb. – not accepted
  Oreochrysum Rydb. – accepted – goldenrod
  Oxalis coloradensis Rydb. – not accepted
  Panicum capillare var. occidentale Rydb. – not accepted
  Papaver pygmaeum Rydb. – accepted – alpine poppy
  Parietaria occidentalis Rydb. – not accepted
  Parnassia floridana Rydb. – not accepted
  Parnassia intermedia Rydb. – not accepted
  Paronychia wardii Rydb. – not accepted
  Parosela carnescens Rydb. – not accepted
  Parosela floridana Rydb. – not accepted
  Parosela longipila Rydb. – not accepted
  Parosela mollissima Rydb. – not accepted
  Parrya platycarpa Rydb. – not accepted
  Pectis multisetosa Rydb. – not accepted
  Pedicularis ctenophora Rydb. – not accepted
  Pedicularis cystopteridifolia Rydb. – accepted – fernleaved pedicularis
  Pedicularis hallii Rydb. – not accepted
  Pedicularis lunata Rydb. – not accepted
  Pedicularis montanensis Rydb. – not accepted
  Pedicularis siifolia Rydb. – not accepted
  Pediomelum Rydb. – accepted – Indian breadroot, breadroot, scurfpea
  Pediomelum brachypus Rydb. – not accepted
  Pediomelum humile Rydb. – accepted – Rydberg's Indian breadroot, Rydberg's scurpea
  Pediomelum trinervatum Rydb. – not accepted
  Penstemon aridus Rydb. – accepted – stiffleaf penstemon
  Penstemon cyathophorus Rydb. – accepted – Northpark penstemon, sagebrush beardtongue
  Penstemon diphyllus Rydb. – accepted – twoleaf beardtongue
  Penstemon leonardii Rydb. – accepted – Leonard's penstemon, Leonard's beardtongue
  Penstemon leonardii var. leonardii Rydb. – accepted – Leonard's beardtongue
  Penstemon platyphyllus Rydb. – accepted – broadleaf penstemon, broadleaf beardtongue
  Penstemon puberulentus Rydb. – not accepted
  Penstemon strictiformis Rydb. – accepted – stiff penstemon, Mancos penstemon
  Penstemon subglaber Rydb. – accepted – smooth penstemon
  Penstemon suffrutescens Rydb. – not accepted
  Penstemon unilateralis Rydb. – not accepted – oneside penstemon
  Penstemon wilcoxii Rydb. – accepted – Wilcox's penstemon
  Petalostemon mollis Rydb. – not accepted
  Petalostemon pilosulus Rydb. – not accepted
  Petasites alaskanus Rydb. – not accepted
  Petasites hyperboreus Rydb. – not accepted
  Petrophyton Rydb. – not accepted – rock spirea, rockmat, rockspirea
  Petrophyton acuminatum Rydb. – not accepted – big arroyo rockmat
  Petrophytum acuminatum Rydb. – not accepted – big arroyo rockmat
  Phacelia alba Rydb. – accepted – white scorpion-weed, white scorpionweed, white phacelia
  Phacelia alpina Rydb. – not accepted
  Phacelia leptosepala Rydb. – accepted – narrowsepal phacelia
  Phacelia sericea var. ciliosa Rydb. – not accepted
  Philadelphus argenteus Rydb. – not accepted – silver mockorange, silver mock orange
  Philadelphus palmeri Rydb. – accepted – Palmer's mockorange, Palmer's mock orange
  Philadelphus pumilus Rydb. – not accepted – dwarf mock orange
  Philadelphus pumilus var. pumilus Rydb. – not accepted – dwarf mock orange
  Philadelphus stramineus Rydb. – not accepted
  Philotria linearis Rydb. – not accepted
  Phlox scleranthifolia Rydb. – not accepted
  Physalis ciliosa Rydb. – not accepted
  Physalis comata Rydb. – not accepted
  Physalis floridana Rydb. – not accepted
  Physalis intermedia Rydb. – not accepted
  Physalis macrophysa Rydb. – not accepted
  Physalis mollis var. parvifolia Rydb. – not accepted
  Physalis neomexicana Rydb. – accepted
  Physalis pendula Rydb. – not accepted
  Physalis rotundata Rydb. – not accepted
  Physalis sinuata Rydb. – not accepted
  Physalis subulata Rydb. – accepted – Chihuahuan groundcherry
  Physalis subulata var. subulata Rydb. – accepted – Chihuahuan groundcherry
  Physalis versicolor Rydb. – not accepted
  Physaria acutifolia Rydb. – accepted – sharpleaf twinpod
  Physaria acutifolia var. acutifolia Rydb. – not accepted – southern twinpod, sharpleaf twinpod
  Physaria brassicoides Rydb. – accepted – double twinpod
  Physaria floribunda Rydb. – accepted – pointtip twinpod
  Physaria floribunda ssp. floribunda Rydb. – accepted – pointtip twinpod
  Physaria floribunda var. floribunda Rydb. – not accepted – pointtip twinpod
  Physaria vitulifera Rydb. – accepted – roundtip twinpod
  Picradenia helenioides Rydb. – not accepted
  Pilosella novae-angliae Rydb. – not accepted
  Pilosella richardsonii Rydb. – not accepted
  Piperia Rydb. – not accepted – rein orchid
  Piperia elongata Rydb. – not accepted – denseflower rein orchid
  Piperia elongata ssp. elongata Rydb. – not accepted – denseflower rein orchid
  Piperia lancifolia Rydb. – not accepted
  Piperia leptopetala Rydb. – not accepted – narrow-petal rein orchid
  Piperia maritima Rydb. – not accepted
  Piperia multiflora Rydb. – not accepted
  Platyschkuhria Rydb. – accepted – basindaisy, platyschkuhria
  Pleiacanthus Rydb. – accepted
  Poa callichroa Rydb. – not accepted
  Poa callida Rydb. – not accepted
  Poa confusa Rydb. – not accepted
  Poa curta Rydb. – not accepted – Wasatch bluegrass
  Poa helleri Rydb. – not accepted
  Poa interior Rydb. – accepted – inland bluegrass
  Poa macroclada Rydb. – not accepted – largesprout bluegrass
  Poa nematophylla Rydb. – not accepted
  Poa overi Rydb. – not accepted
  Poa phoenicea Rydb. – not accepted
  Poa plattensis Rydb. – not accepted
  Poa pratensiformis Rydb. – not accepted
  Poa pudica Rydb. – not accepted
  Poa scaberrima Rydb. – not accepted
  Poa subpurpurea Rydb. – not accepted
  Poa subreflexa Rydb. – not accepted
  Poa subtrivialis Rydb. – not accepted
  Poa tricholepis Rydb. – not accepted
  Poa truncata Rydb. – not accepted
  Polemonium columbianum Rydb. – not accepted
  Polemonium delicatum Rydb. – not accepted
  Polemonium grayanum Rydb. – not accepted
  Populus deltoides var. occidentalis Rydb. – not accepted
  Potamogeton interior Rydb. – not accepted
  Potentilla alaskana Rydb. – not accepted
  Potentilla angustata Rydb. – not accepted
  Potentilla argyrea Rydb. – not accepted
  Potentilla atrorubens Rydb. – not accepted
  Potentilla atrovirens Rydb. – not accepted
  Potentilla bakeri Rydb. – not accepted
  Potentilla bicrenata Rydb. – accepted
  Potentilla bruceae Rydb. – accepted – Bruce's cinquefoil
  Potentilla brunnescens Rydb. – not accepted
  Potentilla camporum Rydb. – not accepted
  Potentilla concinna var. divisa Rydb. – accepted
  Potentilla convallaria Rydb. – not accepted
  Potentilla elmeri Rydb. – not accepted
  Potentilla etomentosa Rydb. – not accepted
  Potentilla flabelliformis var. ctenophora Rydb. – not accepted
  Potentilla glabella Rydb. – not accepted
  Potentilla glabrella Rydb. – not accepted
  Potentilla klamathensis Rydb. – not accepted
  Potentilla langeana Rydb. – not accepted
  Potentilla lasiodonta Rydb. – accepted – Sandhills cinquefoil
  Potentilla leucocarpa Rydb. – not accepted
  Potentilla litoralis Rydb. – accepted – Pennsylvania cinquefoil
  Potentilla longipedunculata Rydb. – not accepted
  Potentilla macounii Rydb. – accepted – Macoun's cinquefoil
  Potentilla macropetala Rydb. – not accepted
  Potentilla millefolia Rydb. – accepted – cutleaf cinquefoil, manyleaf cinquefoil
  Potentilla millefolia var. millefolia Rydb. – not accepted – cutleaf cinquefoil
  Potentilla minutifolia Rydb. – not accepted
  Potentilla modesta Rydb. – accepted – Uintah cinquefoil
  Potentilla nelsoniana Rydb. – not accepted
  Potentilla nipharga Rydb. – not accepted
  Potentilla oblanceolata Rydb. – accepted – New Mexico cinquefoil
  Potentilla paucijuga Rydb. – accepted – La Sal cinquefoil
  Potentilla pectinisecta Rydb. – not accepted – comb-leaf cinquefoil, coilleaf cinquefoil, combleaf cinquefoil
  Potentilla perdissecta Rydb. – not accepted
  Potentilla permollis Rydb. – not accepted
  Potentilla platyloba Rydb. – not accepted
  Potentilla proxima Rydb. – not accepted
  Potentilla pseudorupestris Rydb. – not accepted
  Potentilla pseudosericea Rydb. – accepted – silky cinquefoil
  Potentilla ramulosa Rydb. – not accepted
  Potentilla rectiformis Rydb. – not accepted
  Potentilla rhomboidea Rydb. – not accepted
  Potentilla rubricaulis var. pedersenii Rydb. – not accepted
  Potentilla rubripes Rydb. – not accepted
  Potentilla sanguinea Rydb. – accepted – scarlet cinquefoil
  Potentilla saximontana Rydb. – accepted
  Potentilla subjuga Rydb. – accepted – Colorado cinquefoil
  Potentilla subvillosa Rydb. – not accepted
  Potentilla townsendii Rydb. – accepted – Townsend's cinquefoil
  Potentilla versicolor Rydb. – accepted – Steens Mountain cinquefoil
  Potentilla viridescens Rydb. – not accepted
  Poteridium occidentale Rydb. – accepted
  Prenanthella Rydb. – accepted – prenanthella
  Primula specuicola Rydb. – accepted – cave-dwelling primrose
  Prunus corymbulosa Rydb. – not accepted
  Psathyrotopsis Rydb. – accepted
  Pseudobahia Rydb. – accepted – sunburst
  Pseudoclappia Rydb. – accepted – false clapdaisy, pseudoclappia
  Pseudoclappia arenaria Rydb. – accepted – Trans-Pecos false clapdaisy
  Psilostrophe villosa Rydb. – accepted – woolly paperflower
  Psoralea collina Rydb. – not accepted
  Psoralea stenostachys Rydb. – not accepted
  Psoralidium Rydb. – accepted – scurfpea, breadroot
  Psoralidium batesii Rydb. – not accepted
  Psorothamnus Rydb. – accepted – smokebush
  Ptiloria ramosa Rydb. – not accepted
  Pyrola borealis Rydb. – not accepted
  Pyrola gormanii Rydb. – not accepted
  Pyrola grandiflora var. gormanii Rydb. – not accepted
  Pyrrocoma clementis Rydb. – accepted – tranquil goldenweed
  Pyrrocoma clementis var. clementis Rydb. – accepted – tranquil goldenweed
  Pyrrocoma villosa Rydb. – not accepted
  Quercus eastwoodiae Rydb. – not accepted
  Quercus harvardii Rydb. – not accepted – Harvard oak
  Quercus harvardii var. harvardii Rydb. – not accepted
  Quercus havardii Rydb. – accepted – Havard's oak, sand shinnery oak, sand shinoak, Havard's shinnery oak
  Quercus havardii var. havardii Rydb. – not accepted – Havard oak
  Quercus leptophylla Rydb. – not accepted
  Quercus mandanensis Rydb. – not accepted
  Quercus nitescens Rydb. – not accepted
  Quercus submollis Rydb. – not accepted
  Quercus vreelandii Rydb. – not accepted
  Quercus wilcoxii Rydb. – not accepted
  Raillardella minima Rydb. – not accepted
  Raillardiopsis Rydb. – not accepted – raillardiopsis
  Ribes huronense Rydb. – not accepted
  Ribes inerme Rydb. – accepted – whitestem gooseberries, whitestem gooseberry
  Ribes inerme var. inerme Rydb. – accepted – whitestem gooseberry
  Robinia breviloba Rydb. – not accepted
  Rosa arizonica Rydb. – not accepted
  Rosa aucuparia Rydb. – not accepted
  Rosa bushii Rydb. – not accepted
  Rosa butleri Rydb. – not accepted
  Rosa collaris Rydb. – not accepted
  Rosa conjuncta Rydb. – not accepted
  Rosa floridana Rydb. – not accepted
  Rosa granulifera Rydb. – not accepted
  Rosa nanella Rydb. – not accepted
  Rosa obtusiuscula Rydb. – not accepted – Appalachian Valley rose
  Rosa oreophila Rydb. – not accepted
  Rosa palmeri Rydb. – not accepted
  Rosa petiolata Rydb. – not accepted
  Rosa puberulenta Rydb. – not accepted
  Rosa standleyi Rydb. – not accepted
  Rosa subblanda Rydb. – not accepted
  Rosa subglauca Rydb. – not accepted
  Rosa subserrulata Rydb. – not accepted
  Rosa texarkana Rydb. – not accepted
  Rosa treleasei Rydb. – not accepted
  Rosa underwoodii Rydb. – not accepted
  Rubacer Rydb. – not accepted
  Rubacer tomentosum Rydb. – not accepted
  Rubus aboriginum Rydb. – not accepted – garden dewberry
  Rubus brainerdii Rydb. – not accepted
  Rubus carolinianus Rydb. – not accepted
  Rubus carpinifolius Rydb. – not accepted
  Rubus eastwoodianus Rydb. – not accepted
  Rubus franciscanus Rydb. – not accepted
  Rubus lucidus Rydb. – not accepted – shiny dewberry, manatee dewberry
  Rubus nigricans Rydb. – not accepted
  Rubus ostryifolius Rydb. – not accepted – highbush blackberry
  Rubus persistens Rydb. – not accepted – persistent blackberry
  Rubus rhodophyllus Rydb. – not accepted
  Rubus rubrisetus Rydb. – not accepted
  Rubus subuniflorus Rydb. – not accepted
  Rumex praecox Rydb. – accepted – early dock
  Ruppia pectinata Rydb. – not accepted
  Salix acutidens Rydb. – not accepted
  Salix atra Rydb. – not accepted
  Salix cyclophylla Rydb. – not accepted
  Salix dodgeana Rydb. – not accepted
  Salix flava Rydb. – not accepted
  Salix labradorica Rydb. – not accepted
  Salix linearifolia Rydb. – not accepted
  Salix longistylis Rydb. – not accepted
  Salix luteosericea Rydb. – not accepted
  Salix macounii Rydb. – not accepted
  Salix niphoclada Rydb. – accepted – barrenground willow
  Salix nudescens Rydb. – not accepted
  Salix pachnophora Rydb. – not accepted
  Salix padifolia Rydb. – not accepted
  Salix padophylla Rydb. – not accepted
  Salix paleoneura Rydb. – not accepted
  Salix perrostrata Rydb. – not accepted
  Salix petrophila Rydb. – accepted – alpine willow
  Salix sandbergii Rydb. – not accepted
  Salix saximontana Rydb. – not accepted
  Salix seemanii Rydb. – not accepted
  Salix squamata Rydb. – not accepted
  Salix stenophylla Rydb. – not accepted
  Salix vacciniformis Rydb. – not accepted
  Salix waghornei Rydb. – not accepted
  Salix wyomingensis Rydb. – not accepted
  Sambucus microbotrys Rydb. – not accepted
  Sanguisorba menziesii Rydb. – accepted – Menzies' burnet
  Sartwellia puberula Rydb. – not accepted
  Scutellaria veronicifolia Rydb. – not accepted
  Selaginella densa Rydb. – accepted – small clubmoss, dense clubmoss, lesser spikemoss
  Selaginella densa var. densa Rydb. – not accepted – dense spikemoss, lesser spikemoss
  Senecio acutidens Rydb. – not accepted
  Senecio ambrosioides Rydb. – not accepted
  Senecio crocatus Rydb. – not accepted – saffron ragwort
  Senecio fedifolius Rydb. – not accepted
  Senecio fulgens Rydb. – not accepted
  Senecio glaucifolius Rydb. – not accepted
  Senecio greggii Rydb. – not accepted
  Senecio harbourii Rydb. – not accepted
  Senecio hydrophiloides Rydb. – accepted – tall groundsel
  Senecio jonesii Rydb. – not accepted
  Senecio kingii Rydb. – not accepted
  Senecio leonardii Rydb. – not accepted
  Senecio longipetiolatus Rydb. – not accepted
  Senecio millelobatus Rydb. – not accepted – Uinta ragwort
  Senecio oodes Rydb. – not accepted
  Senecio pereziifolius Rydb. – not accepted
  Senecio platylobus Rydb. – not accepted
  Senecio pseudaureus Rydb. – not accepted – falsegold groundsel
  Senecio pseudaureus var. pseudaureus Rydb. – not accepted – falsegold groundsel
  Senecio sanguisorboides Rydb. – not accepted – burnet ragwort
  Senecio scribneri Rydb. – not accepted
  Senecio subcuneatus Rydb. – not accepted
  Senecio tridenticulatus Rydb. – not accepted – threetooth ragwort
  Senecio tweedyi Rydb. – not accepted
  Sericotheca franciscana Rydb. – not accepted
  Sericotheca obovata Rydb. – not accepted
  Sericotheca pachydisca Rydb. – not accepted
  Sericotheca schaffneri Rydb. – not accepted
  Sibbaldiopsis Rydb. – accepted
  Sideranthus annuus Rydb. – not accepted
  Sideranthus glaberrimus Rydb. – not accepted
  Sideranthus puberulus Rydb. – not accepted
  Sideranthus turbinellus Rydb. – not accepted
  Silene antirrhina var. depauperata Rydb. – not accepted
  Silene antirrhina var. vaccarifolia Rydb. – not accepted
  Smelowskia americana Rydb. – accepted – American false candytuft
  Solanum agrimoniifolium Rydb. – accepted
  Solanum canense Rydb. – accepted
  Solanum interius Rydb. – accepted – deadly nightshade
  Solanum subvelutinum Rydb. – accepted
  Solanum X sambucinum Rydb. – accepted
  Solidago canadensis var. gilvocanescens Rydb. – not accepted – shorthair goldenrod, Canadian goldenrod
  Solidago lunellii Rydb. – not accepted
  Solidago oreophila Rydb. – not accepted
  Sophia intermedia Rydb. – not accepted
  Sophia millefolia Rydb. – not accepted
  Sophia nelsonii Rydb. – not accepted
  Sophia viscosa Rydb. – not accepted
  Sorbus angustifolia Rydb. – not accepted
  Sparganium chlorocarpum Rydb. – not accepted
  Sphaeralcea crandallii Rydb. – not accepted
  Sphaeralcea grandiflora Rydb. – not accepted
  Sphaeralcea subrhomboidea Rydb. – not accepted
  Spiraea subvillosa Rydb. – not accepted
  Spiraea tomentulosa Rydb. – not accepted
  Sporobolus aristatus Rydb. – not accepted
  Stachys asperrima Rydb. – not accepted
  Stachys borealis Rydb. – not accepted
  Stachys subcordata Rydb. – not accepted
  Stachys teucriifolia Rydb. – not accepted
  Stachys teucriiformis Rydb. – not accepted
  Stenotus andersonii Rydb. – not accepted
  Stenotus borealis Rydb. – accepted – northern mock goldenweed
  Stipa porteri Rydb. – not accepted
  Streptanthella Rydb. – accepted
  Symphoricarpos parishii Rydb. – not accepted
  Symphoricarpos utahensis Rydb. – not accepted
  Symphoricarpos vaccinioides Rydb. – not accepted
  Synthyris dissecta Rydb. – accepted – cut-leaf kittentails
  Tagetes alamensis Rydb. – not accepted
  Taraxacum alaskanum Rydb. – accepted
  Taraxacum eriophorum Rydb. – not accepted – woolbearing dandelion
  Taraxacum ovinum Rydb. – not accepted
  Tetraneuris stenophylla Rydb. – not accepted
  Thalictrum hypoglaucum Rydb. – not accepted
  Thelesperma intermedium Rydb. – not accepted
  Thelesperma marginatum Rydb. – not accepted
  Thelypodiopsis Rydb. – accepted – tumble-mustard, tumblemustard
  Thelypodium utahense Rydb. – not accepted
  Therofon turbinatum Rydb. – not accepted
  Townsendia intermedia Rydb. – not accepted
  Townsendia vreelandii Rydb. – not accepted
  Toxicoscordion Rydb. – accepted – deathcamas
  Trifolium aitonii Rydb. – not accepted
  Trifolium bracteolatum Rydb. – not accepted
  Trifolium inaequale Rydb. – not accepted
  Trifolium lilacinum Rydb. – not accepted
  Trifolium lividum Rydb. – not accepted
  Trifolium montanense Rydb. – not accepted
  Trifolium pedunculatum Rydb. – not accepted
  Trifolium stenolobum Rydb. – not accepted
  Trifolium uintense Rydb. – not accepted
  Urtica cardiophylla Rydb. – not accepted
  Urtica strigosissima Rydb. – not accepted
  Urtica viridis Rydb. – not accepted
  Vaccinium globulare Rydb. – not accepted
  Vaccinium oreophilum Rydb. – not accepted
  Vagnera australis Rydb. – not accepted
  Valeriana acutiloba Rydb. – accepted – cordilleran valerian, sharpleaf valerian
  Valeriana acutiloba var. acutiloba Rydb. – accepted – sharpleaf valerian
  Valeriana ovata Rydb. – not accepted
  Valeriana puberulenta Rydb. – not accepted
  Valeriana pubicarpa Rydb. – not accepted
  Valeriana scouleri Rydb. – not accepted – Scouler's valerian
  Valeriana septentrionalis Rydb. – not accepted
  Vanquelinia angustifolia Rydb. – not accepted
  Vauquelinia angustifolia Rydb. – not accepted
  Veratrum speciosum Rydb. – not accepted
  Verbena pumila Rydb. – not accepted
  Vesicarpa Rydb. – accepted
  Vicia producta Rydb. – not accepted
  Vicia trifida Rydb. – not accepted
  Viola montanensis Rydb. – not accepted
  Xylorhiza lanceolata Rydb. – not accepted
  Zigadenus gramineus Rydb. – not accepted
  Zigadenus intermedius Rydb. – not accepted
  Poa pratericola Rydb. & Nash – not accepted
  Paneion pratericola (Rydb. & Nash) Lunell – not accepted
  Vaccinium myrtillus ssp. oreophilum (Rydb.) A. Löve & D. Löve & Kapoor – not accepted
  Antennaria parvifolia var. bracteosa (Rydb.) A. Nelson – not accepted
  Arenaria macrantha (Rydb.) A. Nelson – not accepted
  Crepis alpicola (Rydb.) A. Nelson – not accepted
  Gentiana strictiflora (Rydb.) A. Nelson – not accepted
  Hieracium scouleri var. griseum (Rydb.) A. Nelson – not accepted
  Oxytropis patens (Rydb.) A. Nelson – not accepted
  Petalostemon purpureus var. mollis (Rydb.) A. Nelson – not accepted
  Sideranthus spinulosus var. glaberrimus (Rydb.) A. Nelson – not accepted
  Spiranthes stricta (Rydb.) A. Nelson – not accepted
  Symphoricarpos oreophilus var. utahensis (Rydb.) A. Nelson – accepted – Utah snowberry
  Valeriana acutiloba var. ovata (Rydb.) A. Nelson – not accepted
  Mentzelia laevicaulis var. acuminata (Rydb.) A. Nelson & J.F. Macbr. – not accepted
  Pedicularis contorta var. ctenophora (Rydb.) A. Nelson & J.F. Macbr. – accepted – coiled lousewort
  Pedicularis contorta var. tenophora (Rydb.) A. Nelson & J.F. Macbr. – not accepted
  Cercocarpus betuloides ssp. macrourus (Rydb.) A.E. Murray – not accepted
  Holodiscus discolor ssp. microphyllus (Rydb.) A.E. Murray – not accepted
  Salix rotundifolia var. dodgeana (Rydb.) A.E. Murray – accepted – timberline willow
  Astragalus collieri (Rydb.) A.E. Porsild – not accepted
  Astragalus linearis (Rydb.) A.E. Porsild – not accepted
  Ipomopsis congesta ssp. frutescens (Rydb.) A.G. Day – accepted – ballhead gilia, ballhead ipomopsis
  Aster ciliolatus var. maccallae (Rydb.) A.G. Jones – not accepted – MacCall's aster
  Aster ciliolatus var. maccallii (Rydb.) A.G. Jones – not accepted
  Aster ciliolatus var. wilsonii (Rydb.) A.G. Jones – not accepted – Wilson's aster
  Lewisia rediviva ssp. minor (Rydb.) A.H. Holmgren – not accepted
  Astragalus incurvus (Rydb.) Abrams – not accepted
  Astragalus parishii ssp. perstrictus (Rydb.) Abrams – not accepted
  Astragalus whitneyi ssp. siskiyouensis (Rydb.) Abrams – not accepted
  Horkelia purpurascens ssp. congdonis (Rydb.) Abrams – not accepted
  Potentilla etomentosa var. hallii (Rydb.) Abrams – not accepted
  Thelypodium sagittatum ssp. ovalifolium (Rydb.) Al-Shehbaz – accepted – arrowleaf thelypody, arrow thelypody
  Descurainia nelsonii (Rydb.) Al-Shehbaz & Goodson – accepted – Nelson's tansymustard
  Habenaria behringiana (Rydb.) Ames – not accepted
  Spiranthes cernua var. ochroleuca (Rydb.) Ames – not accepted
  Salix brachycarpa ssp. niphoclada (Rydb.) Argus – not accepted – barrenground willow
  Salix rotundifolia ssp. dodgeana (Rydb.) Argus – not accepted – timberline willow
  Cirsium flodmanii (Rydb.) Arthur – accepted – Flodman's thistle
  Antennaria howellii var. campestris (Rydb.) B. Boivin – not accepted
  Artemisia tridentata var. vaseyana (Rydb.) B. Boivin – not accepted
  Astragalus eucosmus var. fernaldii (Rydb.) B. Boivin – not accepted
  Chrysosplenium alternifolium var. iowense (Rydb.) B. Boivin – not accepted
  Corispermum hyssopifolium var. emarginatum (Rydb.) B. Boivin – not accepted
  Cornus alba var. interior (Rydb.) B. Boivin – not accepted
  Deschampsia cespitosa var. pungens (Rydb.) B. Boivin – not accepted
  Erigeron glabellus var. viscidus (Rydb.) B. Boivin – not accepted
  Erysimum asperum var. angustatum (Rydb.) B. Boivin – not accepted
  Oxytropis leucantha var. depressa (Rydb.) B. Boivin – not accepted
  Oxytropis leucantha var. depressus (Rydb.) B. Boivin – not accepted
  Potentilla gracilis var. ctenophora (Rydb.) B. Boivin – not accepted
  Potentilla gracilis var. filipes (Rydb.) B. Boivin – not accepted
  Potentilla hippiana var. argyrea (Rydb.) B. Boivin – not accepted – woolly cinquefoil
  Potentilla pensylvanica var. litoralis (Rydb.) B. Boivin – not accepted – Pennsylvania cinquefoil
  Salix glauca var. macounii (Rydb.) B. Boivin – not accepted
  Thalictrum confine var. columbianum (Rydb.) B. Boivin – not accepted
  Thalictrum dasycarpum var. hypoglaucum (Rydb.) B. Boivin – not accepted
  Tofieldia glutinosa var. intermedia (Rydb.) B. Boivin – not accepted
  Physocarpus opulifolius var. intermedius (Rydb.) B.L. Rob. – not accepted – Atlantic ninebark
  Hymenopappus filifolius var. nanus (Rydb.) B.L. Turner – accepted – fineleaf hymenopappus
  Hymenopappus filifolius var. tomentosus (Rydb.) B.L. Turner – accepted – finehair hymenopappus
  Iva ambrosiifolia var. lobata (Rydb.) B.L. Turner – not accepted
  Palafoxia rosea var. macrolepis (Rydb.) B.L. Turner & Morris – not accepted – rosy palafox
  Machaeranthera pinnatifida ssp. pinnatifida var. glaberrima (Rydb.) B.L. Turner & R.L. Hartm. – not accepted – lacy tansyaster
  Machaeranthera pinnatifida var. glaberrima (Rydb.) B.L. Turner & R.L. Hartm. – not accepted – lacy tansyaster
  Crepis occidentalis ssp. pumila (Rydb.) Babc. & Stebbins – accepted – largeflower hawksbeard
  Crepis occidentalis var. pumila (Rydb.) Babc. & Stebbins – not accepted
  Telesonix jamesii var. heucheriformis (Rydb.) Bacig. – not accepted
  Ptilagrostis mongholica ssp. porteri (Rydb.) Barkworth – not accepted – Porter's false needlegrass
  Pascopyrum smithii (Rydb.) Barkworth & D.R. Dewey – accepted
  Astragalus calycosus var. mancus (Rydb.) Barneby – accepted – defective milkvetch
  Astragalus calycosus var. monophyllidius (Rydb.) Barneby – accepted – Torrey's milkvetch, one-leaf milkvetch
  Astragalus canovirens (Rydb.) Barneby – not accepted
  Astragalus collinus var. laurentii (Rydb.) Barneby – accepted – Laurent's milkvetch
  Astragalus curvicarpus var. subglaber (Rydb.) Barneby – accepted – smooth loco milkvetch
  Astragalus deanei (Rydb.) Barneby – accepted – Deane's milk-vetch
  Astragalus flexuosus var. sierrae-blancae (Rydb.) Barneby – not accepted
  Astragalus flexuosus var. sierraeblancae (Rydb.) Barneby – not accepted
  Astragalus humistratus var. humivagans (Rydb.) Barneby – accepted – groundcover milkvetch
  Astragalus iodopetalus (Rydb.) Barneby – accepted – violet milkvetch
  Astragalus lentiginosus var. kennedyi (Rydb.) Barneby – accepted – Kennedy's milkvetch
  Astragalus lentiginosus var. macrolobus (Rydb.) Barneby – accepted – West Humboldt milkvetch
  Astragalus lentiginosus var. sesquimetralis (Rydb.) Barneby – accepted – Sodaville milk-vetch, Sodaville milkvetch, Mono locoweed
  Astragalus lentiginosus var. stramineus (Rydb.) Barneby – accepted – freckled milkvetch, straw milkvetch
  Astragalus magdalenae var. niveus (Rydb.) Barneby – accepted
  Astragalus marianus (Rydb.) Barneby – not accepted
  Astragalus miser var. hylophilus (Rydb.) Barneby – accepted – woody milkvetch
  Astragalus nuttallianus var. imperfectus (Rydb.) Barneby – accepted – turkeypeas, imperfect milkvetch, turkey peas
  Astragalus pardalinus (Rydb.) Barneby – accepted – panther milkvetch
  Astragalus paysonii (Rydb.) Barneby – accepted – Payson's milkvetch
  Astragalus purshii var. lagopinus (Rydb.) Barneby – accepted – woollypod milkvetch, hare's-foot milkvetch
  Astragalus reventiformis (Rydb.) Barneby – accepted – Yakima milkvetch
  Astragalus robbinsii var. fernaldii (Rydb.) Barneby – accepted – Fernald's milkvetch, Fernald's milk-vetch, astragale de Robbins variété de Fernald
  Astragalus robbinsii var. harringtonii (Rydb.) Barneby – accepted – Harold's milkvetch
  Astragalus sheldonii (Rydb.) Barneby – accepted – Sheldon's milkvetch
  Astragalus spatulatus var. uniflorus (Rydb.) Barneby – not accepted
  Astragalus tetrapterus var. cinerascens (Rydb.) Barneby – not accepted
  Astragalus whitneyi var. lenophyllus (Rydb.) Barneby – accepted – balloonpod milkvetch, balloon pod milkvetch
  Astragalus whitneyi var. siskiyouensis (Rydb.) Barneby – accepted – Siskiyou milkvetch
  Dalea carthagenensis var. floridana (Rydb.) Barneby – accepted – Florida prairie-clover
  Dalea carthaginensis var. floridana (Rydb.) Barneby – not accepted
  Dalea neomexicana var. longipila (Rydb.) Barneby – accepted – downy prairie clover, downy prairieclover
  Dalea pinnata var. adenopoda (Rydb.) Barneby – accepted – Tampa prairie clover
  Dalea versicolor var. glabrescens (Rydb.) Barneby – accepted
  Lupinus argenteus var. argentatus (Rydb.) Barneby – not accepted
  Oxytropis besseyi var. argophylla (Rydb.) Barneby – accepted – Montana locoweed
  Oxytropis campestris var. varians (Rydb.) Barneby – accepted – field locoweed
  Oxytropis lagopus var. atropurpurea (Rydb.) Barneby – accepted – haresfoot locoweed
  Astragalus praelongus var. ellisiae (Rydb.) Barneby ex B.L. Turner – accepted – Ellis' stinking milkvetch
  Astragalus robbinsii var. alpiniformis (Rydb.) Barneby ex C.L. Hitchc. – accepted – Robbins' milkvetch, Robbins milk-vetch
  Artemisia tridentata ssp. vaseyana (Rydb.) Beetle – accepted – big sagebrush, mountain big sagebrush
  Gaillardia pinnatifida var. linearis (Rydb.) Biddulph – not accepted – red dome blanketflower, reddome blanketflower
  Oxytropis besseyi (Rydb.) Blank. – accepted – Bessey's locoweed, red crazyweed
  Oxytropis besseyi var. besseyi (Rydb.) Blank. – accepted – Bessey's locoweed
  Sisymbrium viscosum (Rydb.) Blank. – not accepted
  Silene drummondii var. striata (Rydb.) Bocquet – not accepted – Drummond's campion
  Agropyron pseudorepens var. vulpinum (Rydb.) Boivin – not accepted
  Phacelia neomexicana var. alba (Rydb.) Brand – not accepted
  Polemonium foliosissimum ssp. robustum (Rydb.) Brand – not accepted
  Polemonium pulcherrimum ssp. delicatum (Rydb.) Brand – accepted – beautiful Jacob's-ladder, skunkweed Jacob's-ladder
  Toxicoscordion venenosum var. gramineum (Rydb.) Brasher – accepted – grassy deathcamas
  Erigeron speciosus var. conspicuus (Rydb.) Breitung – not accepted
  Potentilla glandulosa var. pseudorupestris (Rydb.) Breitung – not accepted
  Arabidopsis novae-angliae (Rydb.) Britton – not accepted
  Populus occidentalis (Rydb.) Britton ex Rydb. – not accepted
  Lonicera dioica var. glaucescens (Rydb.) Butters – not accepted – limber honeysuckle
  Poa nemoralis var. interior (Rydb.) Butters & Abbe – not accepted
  Tephrosia thurberi (Rydb.) C.E. Wood – accepted – Thurber's hoarypea, Thurber's hoary-pea
  Physocarpus intermedius (Rydb.) C.K. Schneid. – accepted – Atlantic ninebark
  Salix alaxensis var. longistylis (Rydb.) C.K. Schneid. – accepted – feltleaf willow
  Salix bebbiana var. perrostrata (Rydb.) C.K. Schneid. – not accepted
  Salix cordifolia var. macounii (Rydb.) C.K. Schneid. – not accepted
  Salix exigua var. luteosericea (Rydb.) C.K. Schneid. – not accepted
  Salix exigua var. stenophylla (Rydb.) C.K. Schneid. – not accepted
  Salix interior var. luteosericea (Rydb.) C.K. Schneid. – not accepted
  Salix nivalis var. saximontana (Rydb.) C.K. Schneid. – not accepted
  Anemone drummondii var. lithophila (Rydb.) C.L. Hitchc. – accepted – Little Belt Mountain thimbleweed
  Astragalus reventus var. sheldonii (Rydb.) C.L. Hitchc. – not accepted
  Claytonia lanceolata var. multiscapa (Rydb.) C.L. Hitchc. – not accepted – lanceleaf springbeauty
  Claytonia megarhiza var. bellidiflora (Rydb.) C.L. Hitchc. – not accepted
  Claytonia megarhiza var. bellidifolia (Rydb.) C.L. Hitchc. – not accepted – alpine springbeauty
  Corydalis caseana var. hastata (Rydb.) C.L. Hitchc. – not accepted
  Descurainia pinnata var. intermedia (Rydb.) C.L. Hitchc. – not accepted
  Distichlis stricta var. dentata (Rydb.) C.L. Hitchc. – not accepted
  Draba grayana (Rydb.) C.L. Hitchc. – accepted – Gray's draba
  Fragaria vesca var. crinita (Rydb.) C.L. Hitchc. – not accepted
  Gentiana calycosa var. obtusiloba (Rydb.) C.L. Hitchc. – not accepted
  Geranium viscosissimum var. nervosum (Rydb.) C.L. Hitchc. – not accepted – sticky purple geranium
  Geum rossii var. turbinatum (Rydb.) C.L. Hitchc. – not accepted – Ross' avens
  Lepidium lasiocarpum var. georginum (Rydb.) C.L. Hitchc. – not accepted
  Lepidium montanum var. jonesii (Rydb.) C.L. Hitchc. – not accepted – Jones' pepperweed, Jones pepperweed
  Lupinus argenteus var. depressus (Rydb.) C.L. Hitchc. – not accepted
  Parnassia fimbriata var. intermedia (Rydb.) C.L. Hitchc. – not accepted – fringed grass of Parnassus, intermediate parnassia
  Philadelphus microphyllus ssp. argenteus (Rydb.) C.L. Hitchc. – not accepted
  Philadelphus microphyllus ssp. pumilus (Rydb.) C.L. Hitchc. – not accepted
  Philadelphus microphyllus ssp. stramineus (Rydb.) C.L. Hitchc. – not accepted
  Potentilla concinna var. macounii (Rydb.) C.L. Hitchc. – not accepted
  Potentilla concinna var. rubripes (Rydb.) C.L. Hitchc. – not accepted
  Potentilla diversifolia var. perdissecta (Rydb.) C.L. Hitchc. – not accepted – mountain-meadow cinquefoil, mountainmeadow cinquefoil
  Potentilla glandulosa var. intermedia (Rydb.) C.L. Hitchc. – not accepted
  Potentilla gracilis var. brunnescens (Rydb.) C.L. Hitchc. – not accepted – slender cinquefoil, sagebrush cinquefoil
  Potentilla gracilis var. permollis (Rydb.) C.L. Hitchc. – not accepted
  Spiraea douglasii var. roseata (Rydb.) C.L. Hitchc. – not accepted
  Trifolium longipes var. pedunculatum (Rydb.) C.L. Hitchc. – not accepted
  Lupinus laxiflorus var. pseudoparviflorus (Rydb.) C.P. Sm. & H. St. John – not accepted
  Salix lasiolepis var. sandbergii (Rydb.) C.R. Ball – not accepted
  Salix ovalifolia var. cyclophylla (Rydb.) C.R. Ball – accepted – oval-leaf willow
  Salix pseudomonticola var. padophylla (Rydb.) C.R. Ball – not accepted
  Astragalus tidestromii (Rydb.) Clokey – accepted – Tidestrom's milkvetch
  Cirsium coloradense (Rydb.) Cockerell – not accepted
  Hymenoxys helenioides (Rydb.) Cockerell – accepted – Intermountain rubberweed, Intermountain bitterweed, Intermountain hymenoxys
  Cirsium plattense (Rydb.) Cockerell ex Daniels – not accepted
  Oxytropis campestris ssp. varians (Rydb.) Cody – not accepted
  Gilia spicata var. cephaloidea (Rydb.) Constance & Rollins – not accepted
  Gilia spicata var. tridactyla (Rydb.) Constance & Rollins – not accepted
  Habenaria sparsiflora var. laxiflora (Rydb.) Correll – not accepted
  Astragalus emoryanus (Rydb.) Cory – accepted – Emory's milkvetch
  Astragalus emoryanus var. emoryanus (Rydb.) Cory – accepted – Emory's milkvetch
  Dalea longipila (Rydb.) Cory – not accepted
  Delphinium virescens var. macroceratilis (Rydb.) Cory – not accepted
  Haplopappus annuus (Rydb.) Cory – not accepted
  Haplopappus validus (Rydb.) Cory – not accepted
  Palafoxia macrolepis (Rydb.) Cory – not accepted
  Sesbania drummondii (Rydb.) Cory – accepted – poisonbean
  Tephrosia texana (Rydb.) Cory – not accepted
  Grossularia inermis (Rydb.) Coville & Britton – not accepted
  Astragalus harringtonii (Rydb.) Coville & Standl. ex Hultén – not accepted
  Agoseris glauca var. asper (Rydb.) Cronquist – not accepted
  Arnica discoidea var. alata (Rydb.) Cronquist – not accepted
  Arnica latifolia var. gracilis (Rydb.) Cronquist – not accepted
  Aster falcatus var. crassulus (Rydb.) Cronquist – not accepted – rough white prairie aster
  Astragalus decumbens var. oblongifolius (Rydb.) Cronquist – not accepted
  Astragalus miser var. oblongifolius (Rydb.) Cronquist – accepted – timber milkvetch
  Carex scirpoidea var. pseudoscirpoidea (Rydb.) Cronquist – not accepted
  Chrysopsis villosa var. angustifolia (Rydb.) Cronquist – not accepted
  Cryptantha intermedia var. grandiflora (Rydb.) Cronquist – not accepted
  Dicoria canescens var. hispidula (Rydb.) Cronquist – not accepted
  Eleocharis flavescens var. thermalis (Rydb.) Cronquist – not accepted – yellow spikerush
  Erigeron formosissimus var. viscidus (Rydb.) Cronquist – not accepted – beautiful fleabane
  Erigeron pulcherrimus var. wyomingia (Rydb.) Cronquist – not accepted
  Erigeron subtrinervis ssp. conspicuus (Rydb.) Cronquist – not accepted
  Erigeron subtrinervis var. conspicuus (Rydb.) Cronquist – not accepted – threenerve fleabane
  Eritrichium nanum var. elongatum (Rydb.) Cronquist – accepted – arctic alpine forget-me-not
  Gilia aggregata var. candida (Rydb.) Cronquist – not accepted
  Gilia congesta var. frutescens (Rydb.) Cronquist – not accepted
  Gilia inconspicua var. tweedyi (Rydb.) Cronquist – not accepted
  Gilia sinuata var. tweedyi (Rydb.) Cronquist – not accepted
  Haplopappus lanuginosus var. andersonii (Rydb.) Cronquist – not accepted
  Helianthus pauciflorus var. subrhomboideus (Rydb.) Cronquist – not accepted
  Helianthus rigidus var. subrhomboideus (Rydb.) Cronquist – not accepted
  Juncus ensifolius var. brunnescens (Rydb.) Cronquist – not accepted
  Oenothera caespitosa var. macroglottis (Rydb.) Cronquist – not accepted
  Oenothera cespitosa var. macroglottis (Rydb.) Cronquist – not accepted
  Pedicularis bracteosa var. siifolia (Rydb.) Cronquist – accepted – smoothflower lousewort
  Penstemon attenuatus var. pseudoprocerus (Rydb.) Cronquist – accepted – small penstemon
  Phacelia hastata var. alpina (Rydb.) Cronquist – not accepted
  Phacelia hastata var. leptosepala (Rydb.) Cronquist – not accepted
  Polemonium pulcherrimum var. delicatum (Rydb.) Cronquist – not accepted
  Symphoricarpos oreophilus var. parishii (Rydb.) Cronquist – not accepted
  Valeriana acutiloba var. pubicarpa (Rydb.) Cronquist – accepted – hairyfruit valerian, hairyfruit valeriana
  Deschampsia cespitosa var. alpicola (Rydb.) D. Löve & B.M. Kapoor – not accepted
  Lupinus arbustus ssp. pseudoparviflorus (Rydb.) D.B. Dunn – accepted – longspur lupine, false lupine
  Lupinus pusillus ssp. rubens (Rydb.) D.B. Dunn – accepted – rusty lupine
  Achillea lanulosa ssp. alpicola (Rydb.) D.D. Keck – not accepted
  Artemisia ludoviciana ssp. candicans (Rydb.) D.D. Keck – accepted – gray sagewort, white sagebrush
  Artemisia ludoviciana ssp. sulcata (Rydb.) D.D. Keck – accepted – white sagebrush, green sagewort
  Dicoria canescens ssp. hispidula (Rydb.) D.D. Keck – not accepted – desert twinbugs
  Horkelia cuneata ssp. puberula (Rydb.) D.D. Keck – not accepted – wedgeleaf horkelia
  Horkelia tridentata ssp. flavescens (Rydb.) D.D. Keck – not accepted – threetooth honeydew, threetooth horkelia
  Ivesia lycopodioides ssp. megalopetala (Rydb.) D.D. Keck – not accepted – clubmoss mousetail
  Ivesia lycopodioides ssp. scandularis (Rydb.) D.D. Keck – not accepted – clubmoss mousetail
  Ivesia purpurascens ssp. congdonis (Rydb.) D.D. Keck – not accepted
  Penstemon attenuatus ssp. pseudoprocerus (Rydb.) D.D. Keck – not accepted
  Penstemon strictus ssp. strictiformis (Rydb.) D.D. Keck – not accepted
  Penstemon triphyllus ssp. diphyllus (Rydb.) D.D. Keck – not accepted
  Potentilla arguta ssp. convallaria (Rydb.) D.D. Keck – not accepted – cream cinquefoil
  Potentilla drummondii ssp. bruceae (Rydb.) D.D. Keck – not accepted – Drummond's cinquefoil
  Potentilla glandulosa ssp. arizonica (Rydb.) D.D. Keck – not accepted – Arizona cinquefoil
  Potentilla glandulosa ssp. glabrata (Rydb.) D.D. Keck – not accepted – sticky cinquefoil
  Potentilla glandulosa ssp. micropetala (Rydb.) D.D. Keck – not accepted – smallpetal cinquefoil
  Potentilla glandulosa ssp. pseudorupestris (Rydb.) D.D. Keck – not accepted – sticky cinquefoil
  Cirsium clavatum var. osterhoutii (Rydb.) D.J. Keil – accepted – Osterhout's thistle, jeweled thistle
  Cirsium cymosum var. canovirens (Rydb.) D.J. Keil – accepted – graygreen thistle
  Cirsium scariosum var. coloradense (Rydb.) D.J. Keil – accepted – Colorado thistle, summer thistle, glory thistle
  Descurainia intermedia (Rydb.) Daniels – not accepted
  Nuttallia sinuata (Rydb.) Daniels – not accepted
  Lewisia glandulosa (Rydb.) Dempster – not accepted – Sierra lewisia
  Symphoricarpos rotundifolius var. parishii (Rydb.) Dempster – accepted – Parish's snowberry
  Descurainia pinnata ssp. intermedia (Rydb.) Detling – not accepted – western tansymustard
  Descurainia pinnata ssp. nelsonii (Rydb.) Detling – not accepted – Nelson's tansymustard
  Descurainia richardsonii ssp. viscosa (Rydb.) Detling – not accepted
  Cirsium tioganum var. coloradense (Rydb.) Dorn – not accepted – Colorado thistle, stemless thistle
  Descurainia incana var. viscosa (Rydb.) Dorn – not accepted
  Eremogone congesta var. lithophila (Rydb.) Dorn – accepted – rock-loving sandwort
  Geranium atropurpureum var. cowenii (Rydb.) Dorn – not accepted – western purple cranesbill
  Haplopappus macronema var. linearis (Rydb.) Dorn – not accepted
  Heterotheca depressa (Rydb.) Dorn – not accepted
  Heuchera cylindrica var. suksdorfii (Rydb.) Dorn – not accepted
  Ipomopsis aggregata var. tenuilobus (Rydb.) Dorn – not accepted
  Ipomopsis aggregata var. tenuituba (Rydb.) Dorn – not accepted
  Lathyrus lanszwertii var. leucanthus (Rydb.) Dorn – accepted – Nevada pea, aspen peavine, Arizona peavine
  Oenothera villosa var. strigosa (Rydb.) Dorn – not accepted
  Vaccinium myrtillus var. oreophilum (Rydb.) Dorn – not accepted – whortleberry
  Phacelia leucophylla var. alpina (Rydb.) Dundas – not accepted
  Carex scirpoidea ssp. pseudoscirpoidea (Rydb.) Dunlop – accepted – western singlespike sedge
  Eupatorium purpureum var. holzingeri (Rydb.) E. Lamont – not accepted – Holzinger's eupatorium
  Croptilon hookerianum var. validum (Rydb.) E.B. Sm. – accepted – Hooker's scratchdaisy
  Heuchera villosa var. arkansana (Rydb.) E.B. Sm. – accepted – Arkansas alumroot
  Eutrochium purpureum var. holzingeri (Rydb.) E.E. Lamont – accepted – Holzinger's eupatorium
  Antennaria arida var. humilis (Rydb.) E.E. Nelson – not accepted
  Antennaria rosea var. angustifolia (Rydb.) E.E. Nelson – not accepted
  Amorpha occidentalis var. arizonica (Rydb.) E.J. Palmer – not accepted
  Clematis virginiana var. missouriensis (Rydb.) E.J. Palmer & Steyerm. – not accepted
  Scrophularia occidentalis (Rydb.) E.P. Bicknell – not accepted
  Arnica spathulata var. eastwoodiae (Rydb.) Ediger & T.M. Barkley – not accepted
  Boykinia jamesii var. heucheriformis (Rydb.) Engl. – not accepted
  Salvia carnosa ssp. argentea (Rydb.) Epling – not accepted
  Horkelia cuneata var. puberula (Rydb.) Ertter & Reveal – accepted – wedgeleaf horkelia
  Horkelia fusca var. brownii (Rydb.) Ertter & Reveal – accepted – bighead horkelia
  Horkelia tridentata var. flavescens (Rydb.) Ertter & Reveal – accepted – threetooth horkelia
  Ivesia lycopodioides var. megalopetala (Rydb.) Ertter & Reveal – accepted – clubmoss mousetail
  Ivesia lycopodioides var. scandularis (Rydb.) Ertter & Reveal – accepted – clubmoss mousetail
  Delphinium virescens ssp. wootonii (Rydb.) Ewan – not accepted
  Picradeniopsis Rydb. ex Britton – accepted – bahia
  Lesquerella engelmannii ssp. ovalifolia (Rydb. ex Britton) C. Clark – not accepted
  Geranium marginale Rydb. ex Hanks & Small – not accepted – western geranium
  Horkelia caruifolia Rydb. ex Howell – not accepted
  Horkelia pseudocapitata Rydb. ex Howell – not accepted
  Potentilla caruifolia (Rydb. ex Howell) Crum – not accepted
  Horkelia fusca ssp. pseudocapitata (Rydb. ex Howell) D.D. Keck – not accepted – littlehead horkelia
  Horkelia daucifolia var. caruifolia (Rydb. ex Howell) Ertter & Reveal – accepted – carrotleaf horkelia
  Ivesia gordonii var. alpicola (Rydb. ex Howell) Ertter & Reveal – accepted – Gordon's ivesia
  Potentilla douglasii var. pseudocapitata (Rydb. ex Howell) Jeps. – not accepted – pinewoods horkelia
  Horkelia fusca var. pseudocapitata (Rydb. ex Howell) M. Peck – accepted
  Horkelia gordonii var. alpicola (Rydb. ex Howell) Rydb. – not accepted
  Salix rotundata Rydb. ex Macoun – not accepted
  Erigeron subtrinervis Rydb. ex Porter & Britton – accepted – threenerve fleabane, three-nerve fleabane, threeveined fleabane
  Erigeron subtrinervis var. subtrinervis Rydb. ex Porter & Britton – not accepted – threenerve fleabane
  Meriolix intermedia Rydb. ex Small – not accepted
  Meriolix melanoglottis Rydb. ex Small – not accepted
  Parietaria obtusa Rydb. ex Small – not accepted
  Verbena ambrosiifolia Rydb. ex Small – not accepted
  Parietaria pensylvanica var. obtusa (Rydb. ex Small) Shinners – not accepted – Pennsylvania pellitory
  Valeriana capitata ssp. acutiloba (Rydb.) F.G. Mey. – not accepted
  Valeriana capitata ssp. pubicarpa (Rydb.) F.G. Mey. – not accepted
  Valeriana sitchensis ssp. scouleri (Rydb.) F.G. Mey. – accepted
  Astragalus tenellus var. strigulosus (Rydb.) F.J. Herm. – not accepted
  Cercocarpus montanus var. argenteus (Rydb.) F.L. Martin – not accepted – silver birchleaf mountain-mahogany, silver mountain-mahogany
  Cercocarpus montanus var. macrourus (Rydb.) F.L. Martin – not accepted – Klamath mountain-mahogany
  Trisetum spicatum var. majus (Rydb.) Farw. – not accepted
  Elatine californica var. williamsii (Rydb.) Fassett – not accepted
  Boykinia turbinata (Rydb.) Fedde – not accepted
  Boykinia vancouverensis (Rydb.) Fedde – not accepted
  Dicentra occidentalis (Rydb.) Fedde – not accepted
  Arenaria obtusiloba (Rydb.) Fernald – not accepted
  Artemisia ludoviciana var. brittonii (Rydb.) Fernald – not accepted
  Aruncus allegheniensis var. pubescens (Rydb.) Fernald – not accepted
  Aruncus dioicus var. pubescens (Rydb.) Fernald – accepted – bride's feathers
  Braya humilis var. novae-angliae (Rydb.) Fernald – not accepted
  Braya richardsonii (Rydb.) Fernald – not accepted
  Carex aquatilis var. altior (Rydb.) Fernald – not accepted
  Helianthus laetiflorus var. subrhomboideus (Rydb.) Fernald – not accepted
  Oenothera tetragona var. latifolia (Rydb.) Fernald – not accepted
  Rosa virginiana var. lamprophylla (Rydb.) Fernald – not accepted – Virginia rose
  Salix rostrata var. perrostrata (Rydb.) Fernald – not accepted
  Solidago decumbens var. oreophila (Rydb.) Fernald – not accepted
  Geum canadense var. camporum (Rydb.) Fernald & Weath. – not accepted – white avens
  Fragaria virginiana var. terrae-novae (Rydb.) Fernald & Wiegand – not accepted
  Chaenactis douglasii var. rubricaulis (Rydb.) Ferris – not accepted
  Lewisia columbiana ssp. congdonii (Rydb.) Ferris – not accepted
  Lewisia pygmaea ssp. glandulosa (Rydb.) Ferris – not accepted
  Orobanche corymbosa (Rydb.) Ferris – accepted – Rydberg's broomrape, flat-top broomrape
  Orobanche corymbosa ssp. corymbosa (Rydb.) Ferris – accepted – flattop broomrape, flat-top broomrape
  Lupinus sericeus ssp. marianus (Rydb.) Fleak & D.B. Dunn – accepted – silky lupine
  Chenopodium fremontii var. atrovirens (Rydb.) Fosberg – not accepted
  Solidago canescens (Rydb.) Friesner – not accepted
  Descurainia incisa var. viscosa (Rydb.) G.A. Mulligan – not accepted
  Argemone munita ssp. rotundata (Rydb.) G.B. Ownbey – accepted – flatbud pricklypoppy, flatbud prickly poppy
  Corydalis caseana ssp. brachycarpa (Rydb.) G.B. Ownbey – accepted – Sierra fumewort
  Corydalis caseana ssp. hastata (Rydb.) G.B. Ownbey – accepted – Sierra fumewort
  Ericameria discoidea var. linearis (Rydb.) G.L. Nesom – not accepted – whitestem goldenbush
  Ericameria obovata (Rydb.) G.L. Nesom – accepted – Rydberg's goldenbush
  Grindelia nuda var. aphanactis (Rydb.) G.L. Nesom – not accepted – curlytop gumweed, rayless gumweed
  Symphyotrichum ciliolatum var. maccallae (Rydb.) G.L. Nesom – not accepted
  Symphyotrichum ciliolatum var. wilsonii (Rydb.) G.L. Nesom – not accepted
  Symphyotrichum falcatum var. crassulum (Rydb.) G.L. Nesom – not accepted – white prairie aster
  Symphyotrichum molle (Rydb.) G.L. Nesom – accepted – soft aster
  Symphyotrichum X batesii (Rydb.) G.L. Nesom – accepted
  Symphyotrichum X woldenii (Rydb.) G.L. Nesom – accepted
  Ericameria nauseosa ssp. nauseosa var. salicifolia (Rydb.) G.L. Nesom & Baird – not accepted
  Ericameria nauseosa var. salicifolia (Rydb.) G.L. Nesom & Baird – accepted – rubber rabbitbrush
  Symphyotrichum X finkii (Rydb.) G.L. Nesom (pro sp.) – accepted
  Achillea millefolium var. fusca (Rydb.) G.N. Jones – not accepted
  Achillea millefolium var. pacifica (Rydb.) G.N. Jones – not accepted – Pacific yarrow
  Androsace septentrionalis ssp. puberulenta (Rydb.) G.T. Robbins – not accepted – pygmyflower rockjasmine, pygmy-flower rock-jasmine
  Antennaria pulcherrima var. anaphaloides (Rydb.) G.W. Douglas – not accepted
  Senecio eremophilus ssp. kingii (Rydb.) G.W. Douglas & G. Ruyle-Douglas – not accepted
  Phacelia sericea ssp. ciliosa (Rydb.) G.W. Gillett – accepted – purplefringe, silky phacelia
  Liatris squarrosa var. glabrata (Rydb.) Gaiser – accepted – scaly blazing star, scaly gayfeather
  Liatris squarrosa var. hirsuta (Rydb.) Gaiser – not accepted – scaly blazing star, scaly gayfeather
  Achillea millefolium var. alpicola (Rydb.) Garrett – not accepted – common yarrow
  Heuchera parvifolia var. utahensis (Rydb.) Garrett – not accepted – Utah alumroot
  Dalea exserta (Rydb.) Gentry – accepted – Mexican prairie clover, Mexican prairie-clover
  Campanula aparinoides var. uliginosa (Rydb.) Gleason – not accepted
  Festuca ovina var. saximontana (Rydb.) Gleason – not accepted
  Elymus smithii (Rydb.) Gould – not accepted
  Physaria spatulata (Rydb.) Grady & O'Kane – accepted – alpine bladderpod
  Amarella strictiflora (Rydb.) Greene – not accepted
  Senecio eremophilus var. kingii (Rydb.) Greenm. – accepted – King's ragwort, King's groundsel, ragwort groundsel
  Aruncus dioicus var. acuminatus (Rydb.) H. Hara – accepted – bride's feathers
  Androsace occidentalis var. simplex (Rydb.) H. St. John – not accepted
  Cornus sericea var. interior (Rydb.) H. St. John – not accepted
  Cornus stolonifera var. interior (Rydb.) H. St. John – not accepted
  Elodea linearis (Rydb.) H. St. John – not accepted – Nashville waterweed
  Haplopappus carthamoides var. erythropappus (Rydb.) H. St. John – not accepted
  Mentzelia albicaulis var. ctenophora (Rydb.) H. St. John – not accepted
  Mentzelia albicaulis var. tenerrima (Rydb.) H. St. John – not accepted
  Arenaria fendleri var. eastwoodiae (Rydb.) H.D. Harr. – not accepted
  Cryptantha jamesii var. pustulosa (Rydb.) H.D. Harr. – not accepted
  Geranium fremontii var. cowenii (Rydb.) H.D. Harr. – not accepted
  Luzula subcapitata (Rydb.) H.D. Harr. – accepted – Colorado woodrush
  Astragalus fernaldii (Rydb.) H.F. Lewis – not accepted
  Mentzelia gracilis (Rydb.) H.J. Thomps. & F.H. Lewis – not accepted
  Chrysothamnus nauseosus var. salicifolius (Rydb.) H.M. Hall – not accepted
  Fragaria virginiana var. platypetala (Rydb.) H.M. Hall – not accepted
  Haplopappus carthamoides ssp. rigidus (Rydb.) H.M. Hall – not accepted
  Haplopappus lanuginosus ssp. andersonii (Rydb.) H.M. Hall – not accepted
  Haplopappus phyllocephalus ssp. annuus (Rydb.) H.M. Hall – not accepted
  Haplopappus spinulosus ssp. glaberrimus (Rydb.) H.M. Hall – not accepted
  Stenotus lanuginosus var. andersonii (Rydb.) H.M. Hall – accepted – Anderson's mock goldenweed, Anderson's goldenweed
  Atriplex canescens ssp. garrettii (Rydb.) H.M. Hall & Clem. – not accepted
  Atriplex nuttallii ssp. buxifolia (Rydb.) H.M. Hall & Clem. – not accepted
  Chrysothamnus greenei ssp. filifolius (Rydb.) H.M. Hall & Clem. – not accepted
  Chrysothamnus nauseosus ssp. salicifolius (Rydb.) H.M. Hall & Clem. – not accepted
  Helianthus rigidus ssp. laetiflorus (Rydb.) Heiser – not accepted
  Helianthus rigidus ssp. subrhomboideus (Rydb.) Heiser – not accepted
  Psilostrophe tagetina var. grandiflora (Rydb.) Heiser – not accepted
  Philadelphus microphyllus var. stramineus (Rydb.) Henrickson – accepted – littleleaf mock orange
  Cryptantha cinerea var. pustulosa (Rydb.) Higgins – accepted – James' cryptantha, James' catseye
  Agropyron vulpinum (Rydb.) Hitchc. – not accepted
  Elymus ambiguus var. strigosus (Rydb.) Hitchc. – not accepted
  Noccaea coloradensis (Rydb.) Holub – not accepted
  Potentilla kelloggii var. puberula (Rydb.) Hoover – not accepted
  Ibidium strictum (Rydb.) House – not accepted
  Minuartia macrantha (Rydb.) House – accepted – House's stitchwort
  Minuartia obtusiloba (Rydb.) House – accepted – alpine sandwort, twinflower sandwort
  Artemisia arctica ssp. comata (Rydb.) Hultén – not accepted – boreal sagebrush
  Artemisia arctica ssp. saxicola (Rydb.) Hultén – not accepted – arctic wormwood
  Artemisia tilesii ssp. gormanii (Rydb.) Hultén – not accepted – Tilesius' wormwood
  Astragalus robbinsii ssp. harringtonii (Rydb.) Hultén – not accepted
  Braya humilis ssp. richardsonii (Rydb.) Hultén – not accepted
  Carex aquatilis ssp. altior (Rydb.) Hultén – not accepted
  Cerastium beeringianum ssp. earlei (Rydb.) Hultén – not accepted – Bering chickweed
  Chimaphila umbellata ssp. acuta (Rydb.) Hultén – accepted – pipsissewa
  Chimaphila umbellata ssp. occidentalis (Rydb.) Hultén – accepted – pipsissewa
  Chrysosplenium alternifolium ssp. iowense (Rydb.) Hultén – not accepted
  Draba nivalis ssp. lonchocarpa (Rydb.) Hultén – not accepted
  Erigeron glabellus var. yukonensis (Rydb.) Hultén – not accepted
  Festuca brachyphylla ssp. saximontana (Rydb.) Hultén – not accepted
  Galium trifidum ssp. columbianum (Rydb.) Hultén – accepted – threepetal bedstraw
  Geum macrophyllum ssp. perincisum (Rydb.) Hultén – not accepted
  Habenaria dilatata var. media (Rydb.) Hultén – not accepted
  Juncus arcticus ssp. ater (Rydb.) Hultén – not accepted
  Listera cordata var. nephrophylla (Rydb.) Hultén – not accepted – heartleaf twayblade
  Monotropa latisquama (Rydb.) Hultén – not accepted
  Platanthera tipuloides var. behringiana (Rydb.) Hultén – accepted – Aleutian bog orchid
  Salix alaxensis ssp. longistylis (Rydb.) Hultén – not accepted
  Sedum rosea var. frigidum (Rydb.) Hultén – not accepted
  Sedum roseum var. frigidum (Rydb.) Hultén – not accepted
  Hackelia diffusa var. caerulescens (Rydb.) I.M. Johnst. – not accepted
  Hackelia leptophylla (Rydb.) I.M. Johnst. – not accepted
  Hymenopappus filifolius var. cinereus (Rydb.) I.M. Johnst. – accepted – fineleaf hymenopappus, fine-leaf woollywhite
  Mertensia arizonica var. leonardii (Rydb.) I.M. Johnst. – not accepted
  Eremogone eastwoodiae (Rydb.) Ikonn. – accepted – Eastwood's sandwort
  Eremogone eastwoodiae var. eastwoodiae (Rydb.) Ikonn. – accepted – Eastwood's sandwort
  Amorpha herbacea var. crenulata (Rydb.) Isely – accepted – clusterspike false indigo, crenulate lead-plant
  Dalea adenopoda (Rydb.) Isely – not accepted – Tampa prairie clover
  Oxytropis nana var. argophylla (Rydb.) Isely – not accepted – Montana crazyweed
  Oxytropis nana var. besseyi (Rydb.) Isely – not accepted – Bessey's pointvetch
  Trifolium longipes var. pedunculatum (Rydb.) Isely – not accepted
  Trifolium parryi var. montanense (Rydb.) Isely – not accepted
  Mentzelia albicaulis var. gracilis (Rydb.) J. Darl. – not accepted
  Mentzelia laciniata (Rydb.) J. Darl. – accepted – cutleaf blazingstar
  Senecio streptanthifolius var. oodes (Rydb.) J.F. Bain – not accepted – Rocky Mountain groundsel
  Allium cernuum var. neomexicanum (Rydb.) J.F. Macbr. – not accepted – New Mexican nodding onion
  Cirsium drummondii var. acaulescens (Rydb.) J.F. Macbr. – not accepted
  Corispermum orientale var. emarginatum (Rydb.) J.F. Macbr. – not accepted
  Mentzelia dispersa var. latifolia (Rydb.) J.F. Macbr. – accepted – bushy blazingstar
  Psoralea humilis (Rydb.) J.F. Macbr. – not accepted
  Psoralea macrostachya var. longiloba (Rydb.) J.F. Macbr. – not accepted
  Psoralea tenuiflora var. bigelovii (Rydb.) J.F. Macbr. – not accepted
  Zigadenus vaginatus (Rydb.) J.F. Macbr. – not accepted – sheathed deathcamas
  Erigeron compositus var. multifidus (Rydb.) J.F. Macbr. & Payson – not accepted
  Mertensia ciliata var. subpubescens (Rydb.) J.F. Macbr. & Payson – not accepted
  Silene drummondii ssp. striata (Rydb.) J.K. Morton – accepted – Drummond's campion
  Hackelia besseyi (Rydb.) J.L. Gentry – accepted – Bessey's stickseed
  Trifolium dasyphyllum ssp. uintense (Rydb.) J.M. Gillett – accepted – Uinta clover
  Trifolium longipes ssp. pedunculatum (Rydb.) J.M. Gillett – accepted – longstalk clover
  Trifolium parryi ssp. montanense (Rydb.) J.M. Gillett – accepted – Parry's clover
  Aliciella haydenii ssp. crandallii (Rydb.) J.M. Porter – not accepted
  Aliciella hutchinsifolia (Rydb.) J.M. Porter – accepted – desert pale gilia
  Aliciella subacaulis (Rydb.) J.M. Porter & L.A. Johnson – accepted – pinyon gilia
  Trifolium dasyphyllum var. uintense (Rydb.) J.S. Martin ex Isely – not accepted
  Clematis occidentalis var. grosseserrata (Rydb.) J.S. Pringle – accepted – western blue virginsbower
  Ceratoides lanata var. subspinosa (Rydb.) J.T. Howell – not accepted
  Festuca ovina var. minutiflora (Rydb.) J.T. Howell – not accepted
  Potentilla lindleyi var. puberula (Rydb.) J.T. Howell – not accepted
  Potentilla lycopodioides var. megalopetala (Rydb.) J.T. Howell – not accepted
  Potentilla lycopodioides var. scandularis (Rydb.) J.T. Howell – not accepted
  Potentilla sericoleuca (Rydb.) J.T. Howell – not accepted
  Potentilla tilingii var. flavescens (Rydb.) J.T. Howell – not accepted
  Potentilla tweedyi (Rydb.) J.T. Howell – not accepted
  Rubus spectabilis var. franciscanus (Rydb.) J.T. Howell – not accepted – salmonberry
  Rubus ursinus var. eastwoodianus (Rydb.) J.T. Howell – not accepted
  Pediomelum megalanthum var. retrorsum (Rydb.) J.W. Grimes – accepted – Intermountain Indian breadroot
  Rupertia hallii (Rydb.) J.W. Grimes – accepted – Hall's California tea
  Aruncus sylvester ssp. acuminatus (Rydb.) Jeps. – not accepted
  Astragalus didymocarpus var. milesianus (Rydb.) Jeps. – accepted – dwarf white milkvetch, Miles milkvetch
  Astragalus didymocarpus var. obispensis (Rydb.) Jeps. – accepted – San Obispo milkvetch
  Astragalus didymocarpus var. obispoensis (Rydb.) Jeps. – not accepted
  Astragalus minthorniae (Rydb.) Jeps. – accepted – Minthorn's milkvetch
  Astragalus minthorniae var. minthorniae (Rydb.) Jeps. – accepted – Minthorn's milkvetch
  Cercocarpus betuloides var. macrourus (Rydb.) Jeps. – accepted – Klamath mountain-mahogany
  Eriophyllum lanatum var. monoense (Rydb.) Jeps. – not accepted
  Fragaria platypetala var. sibbaldifolia (Rydb.) Jeps. – not accepted
  Holodiscus discolor var. franciscanus (Rydb.) Jeps. – not accepted
  Holodiscus discolor var. microphyllus (Rydb.) Jeps. – not accepted
  Lithophragma glabrum var. bulbiferum (Rydb.) Jeps. – not accepted
  Lupinus odoratus var. rubens (Rydb.) Jeps. – not accepted
  Potentilla argyrocoma (Rydb.) Jeps. – not accepted
  Potentilla gordonii var. chaetophora (Rydb.) Jeps. – not accepted
  Potentilla gracilis var. elmeri (Rydb.) Jeps. – accepted
  Potentilla hispidula (Rydb.) Jeps. – not accepted
  Potentilla millefolia var. klamathensis (Rydb.) Jeps. – not accepted – Klamath cinquefoil
  Potentilla plattensis var. klamathensis (Rydb.) Jeps. – not accepted
  Potentilla plattensis var. millefolia (Rydb.) Jeps. – not accepted
  Potentilla purpurascens var. congdonis (Rydb.) Jeps. – not accepted
  Potentilla truncata (Rydb.) Jeps. – not accepted
  Psoralea hallii (Rydb.) Jeps. – not accepted
  Thelypodium lasiophyllum var. utahense (Rydb.) Jeps. – not accepted
  Claytonia parviflora ssp. utahensis (Rydb.) John M. Mill. & K.L. Chambers – accepted – streambank springbeauty
  Claytonia perfoliata ssp. mexicana (Rydb.) John M. Mill. & K.L. Chambers – accepted – miner's lettuce
  Cirsium acaulescens (Rydb.) K. Schum. – not accepted
  Cirsium centaureae (Rydb.) K. Schum. – not accepted
  Cirsium erosum (Rydb.) K. Schum. – not accepted
  Cirsium griseum (Rydb.) K. Schum. – not accepted – gray thistle
  Cirsium oblanceolatum (Rydb.) K. Schum. – not accepted
  Cirsium oreophilum (Rydb.) K. Schum. – not accepted – crow thistle
  Cirsium pulcherrimum (Rydb.) K. Schum. – accepted – Wyoming thistle
  Cirsium pulcherrimum var. pulcherrimum (Rydb.) K. Schum. – accepted – Wyoming thistle
  Oxytropis varians (Rydb.) K. Schum. – not accepted
  Oxytropis villosa (Rydb.) K. Schum. – not accepted
  Cirsium X erosum (Rydb.) K. Schum. (pro sp.) – not accepted – glory thistle
  Delphinium geyeri var. wootonii (Rydb.) K.C. Davis – not accepted
  Descurainia incana ssp. viscosa (Rydb.) Kartesz & Gandhi – not accepted – mountain tansy mustard, mountain tansymustard
  Sphaeralcea munroana ssp. subrhomboidea (Rydb.) Kearney – not accepted – whitestem globemallow
  Sphaeralcea munroana var. subrhomboidea (Rydb.) Kearney – not accepted
  Astragalus egglestonii (Rydb.) Kearney & Peebles – accepted – Eggleston's milkvetch
  Cercocarpus montanus var. flabellifolius (Rydb.) Kearney & Peebles – not accepted
  Dalea nana var. carnescens (Rydb.) Kearney & Peebles – accepted – dwarf prairie clover, dwarf prairieclover
  Dalea wislizeni var. sanctae-crucis (Rydb.) Kearney & Peebles – not accepted
  Eurotia lanata var. subspinosa (Rydb.) Kearney & Peebles – not accepted
  Geum strictum var. decurrens (Rydb.) Kearney & Peebles – not accepted
  Monotropa hypopithys var. latisquama (Rydb.) Kearney & Peebles – not accepted
  Monotropa hypopitys var. latisquama (Rydb.) Kearney & Peebles – not accepted
  Philadelphus microphyllus var. argenteus (Rydb.) Kearney & Peebles – not accepted
  Potentilla subviscosa var. ramulosa (Rydb.) Kearney & Peebles – accepted – Navajo cinquefoil
  Potentilla thurberi var. atrorubens (Rydb.) Kearney & Peebles – accepted – scarlet cinquefoil
  Potentilla thurberi var. sanguinea (Rydb.) Kearney & Peebles – not accepted – scarlet cinquefoil
  Psoralea megalantha var. retrorsa (Rydb.) Kearney & Peebles – not accepted
  Psoralea mephitica var. retrorsa (Rydb.) Kearney & Peebles – not accepted
  Robinia neomexicana var. subvelutina (Rydb.) Kearney & Peebles – not accepted
  Rosa arizonica var. granulifera (Rydb.) Kearney & Peebles – not accepted
  Sambucus racemosa ssp. pubens var. microbotrys (Rydb.) Kearney & Peebles – not accepted
  Sambucus racemosa var. microbotrys (Rydb.) Kearney & Peebles – accepted – European red elderberry
  Salix arctica var. petrophila (Rydb.) Kelso – not accepted
  Salix barclayi var. padophylla (Rydb.) Kelso – not accepted
  Salix reticulata var. saximontana (Rydb.) Kelso – not accepted
  Lupinus latifolius ssp. leucanthus (Rydb.) Kenney & D.B. Dunn – accepted – broadleaf lupine
  Tephrosia carpenteri (Rydb.) Killip – not accepted
  Baileya multiradiata var. thurberi (Rydb.) Kittell – not accepted
  Agrostis borealis var. bakeri (Rydb.) Koji Ito – not accepted
  Ericameria filifolia (Rydb.) L.C. Anderson – not accepted
  Atriplex canescens var. garrettii (Rydb.) L.D. Benson – not accepted
  Hymenoclea salsola var. pentalepis (Rydb.) L.D. Benson – not accepted – burrobrush, white burrobrush
  Ranunculus acriformis var. montanensis (Rydb.) L.D. Benson – accepted – mountain sharp buttercup
  Corallorhiza striata var. vreelandii (Rydb.) L.O. Williams – accepted – Vreeland's coralroot
  Corallorrhiza striata var. vreelandii (Rydb.) L.O. Williams – not accepted – Vreeland's coralroot, hooded coralroot
  Mertensia viridis var. cana (Rydb.) L.O. Williams – not accepted
  Lupinus argenteus ssp. spathulatus (Rydb.) L.W. Hess & D.B. Dunn – accepted – silvery lupine
  Lupinus argentus var. spathulatus (Rydb.) L.W. Hess & D.B. Dunn – not accepted
  Hieracium scabriusculum var. columbianum (Rydb.) Lepage – not accepted
  Platanthera hyperborea var. purpurascens (Rydb.) Luer – not accepted
  Platanthera sparsiflora var. ensiflora (Rydb.) Luer – not accepted
  Platanthera sparsiflora var. ensifolia (Rydb.) Luer – not accepted – sparse-flowered bog orchid, canyon bog orchid
  Platanthera X media (Rydb.) Luer (pro. sp.) – not accepted – bog orchid
  Ceratoxalis coloradensis (Rydb.) Lunell – not accepted
  Lobelia strictiflora (Rydb.) Lunell – not accepted
  Paneion interius (Rydb.) Lunell – not accepted
  Zeia smithii (Rydb.) Lunell – not accepted
  Antennaria luzuloides var. oblanceolata (Rydb.) M. Peck – not accepted
  Astragalus alpinus var. alpiniformis (Rydb.) M. Peck – not accepted
  Astragalus conjunctus var. sheldonii (Rydb.) M. Peck – not accepted
  Astragalus forwoodii var. wallowensis (Rydb.) M. Peck – not accepted
  Astragalus lagopinus (Rydb.) M. Peck – not accepted
  Astragalus laurentii (Rydb.) M. Peck – not accepted
  Astragalus lentiginosus var. platyphyllidius (Rydb.) M. Peck – accepted – broad-leaved milkvetch
  Astragalus subglaber (Rydb.) M. Peck – not accepted
  Cercocarpus ledifolius var. hypoleucus (Rydb.) M. Peck – not accepted
  Descurainia pinnata var. nelsonii (Rydb.) M. Peck – not accepted
  Descurainia richardsonii var. viscosa (Rydb.) M. Peck – not accepted
  Dicentra cucullaria var. occidentalis (Rydb.) M. Peck – not accepted
  Haplopappus carthamoides var. rigidus (Rydb.) M. Peck – not accepted
  Thalictrum occidentale var. columbianum (Rydb.) M. Peck – not accepted
  Astragalus arrectus var. kelseyi (Rydb.) M.E. Jones – not accepted
  Oxytropis alpicola (Rydb.) M.E. Jones – not accepted
  Valeriana sitchensis var. scouleri (Rydb.) M.E. Jones – not accepted
  Oenothera strigosa (Rydb.) Mack. & Bush – not accepted
  Corallorhiza striata var. ochroleuca (Rydb.) Magrath – not accepted
  Corallorrhiza striata var. ochroleuca (Rydb.) Magrath – not accepted
  Arenaria congesta var. cephaloidea (Rydb.) Maguire – not accepted – sharptip sandwort
  Arenaria congesta var. lithophila (Rydb.) Maguire – not accepted – rock-loving sandwort, loosehead sandwort
  Arenaria fendleri var. tweedyi (Rydb.) Maguire – not accepted – Tweedy's sandwort
  Arnica cordifolia var. humilis (Rydb.) Maguire – not accepted
  Arnica cordifolia var. pumila (Rydb.) Maguire – not accepted
  Arnica louiseana var. brevifolia (Rydb.) Maguire – not accepted
  Arnica louiseana var. illiamnae (Rydb.) Maguire – not accepted
  Arnica louiseana var. mendenhallii (Rydb.) Maguire – not accepted
  Arnica parviflora ssp. alata (Rydb.) Maguire – not accepted
  Arnica spathulata ssp. eastwoodiae (Rydb.) Maguire – not accepted
  Lychnis drummondii var. striata (Rydb.) Maguire – not accepted
  Thlaspi fendleri var. coloradense (Rydb.) Maguire – not accepted
  Lomatium latilobum (Rydb.) Mathias – accepted – Canyonlands biscuitroot, Slicrock desert-parsley
  Lomatium lineare (Rydb.) Mathias – not accepted
  Musineon lineare (Rydb.) Mathias – accepted – narrowleaf wildparsley
  Ligusticum porteri var. brevilobum (Rydb.) Mathias & Constance – accepted – Porter's licoriceroot, Porter's licorice-root
  Pyrrocoma clementis var. villosa (Rydb.) Mayes ex G. Brown & Keil – accepted – tranquil goldenweed
  Trifolium dasyphyllum var. stenolobum (Rydb.) McDermott – not accepted
  Ribes divaricatum var. inerme (Rydb.) McMinn – not accepted
  Salvia carnosa var. argentea (Rydb.) McMinn – not accepted
  Schkuhria pinnata var. guatemalensis (Rydb.) McVaugh – not accepted
  Artemisia californica var. insularis (Rydb.) Munz – not accepted
  Dalea mollis var. mollissima (Rydb.) Munz – not accepted
  Dalea mollissima (Rydb.) Munz – accepted – soft prairie clover, hairy dalea
  Epilobium paniculatum var. laevicaule (Rydb.) Munz – not accepted
  Epilobium paniculatum var. tracyi (Rydb.) Munz – not accepted
  Eriophyllum confertiflorum var. discoideum (Rydb.) Munz – not accepted
  Eriophyllum confertiflorum var. tridactylum (Rydb.) Munz – not accepted
  Gaura neomexicana var. coloradensis (Rydb.) Munz – not accepted – Colorado butterfly plant
  Gayophytum nuttallii var. intermedium (Rydb.) Munz – not accepted
  Lewisia rediviva var. minor (Rydb.) Munz – accepted – bitter root, Oregon bitterroot
  Montia perfoliata var. utahensis (Rydb.) Munz – not accepted
  Oenothera caespitosa ssp. crinita (Rydb.) Munz – not accepted – tufted evening primrose, tufted evening-primrose
  Oenothera caespitosa var. crinita (Rydb.) Munz – not accepted
  Oenothera cespitosa ssp. crinita (Rydb.) Munz – accepted – tufted evening primrose, tufted eveningprimrose
  Oenothera cespitosa var. crinita (Rydb.) Munz – not accepted
  Oenothera latifolia (Rydb.) Munz – not accepted – mountain evening-primrose, mountain eveningprimrose, mountain evening primrose
  Oenothera pallida ssp. latifolia (Rydb.) Munz – accepted – mountain evening primrose
  Orobanche californica var. corymbosa (Rydb.) Munz – not accepted
  Petrophyton caespitosum ssp. acuminatum (Rydb.) Munz – not accepted
  Petrophytum caespitosum ssp. acuminatum (Rydb.) Munz – accepted
  Rubus vitifolius var. eastwoodianus (Rydb.) Munz – not accepted – Pacific dewberry
  Salvia dorrii ssp. argentea (Rydb.) Munz – not accepted
  Astragalus crotalariae var. davidsonii (Rydb.) Munz & McBurney – not accepted
  Astragalus douglasii var. megalophysus (Rydb.) Munz & McBurney – not accepted
  Astragalus douglasii var. perstrictus (Rydb.) Munz & McBurney – accepted – Jacumba milk-vetch, campo milkvetch
  Astragalus pycnostachyus var. lanosissimus (Rydb.) Munz & McBurney – accepted – Ventura marsh milk-vetch, marsh milkvetch
  Cornus interior (Rydb.) N. Petersen – not accepted
  Castilleja rhexiifolia var. sulphurea (Rydb.) N.D. Atwood – not accepted
  Potentilla drummondii var. bruceae (Rydb.) N.H. Holmgren – not accepted
  Elytrigia smithii (Rydb.) Nevski – not accepted
  Habenaria media (Rydb.) Niles – not accepted
  Achillea millefolium var. puberula (Rydb.) Nobs – not accepted – common yarrow
  Machaeranthera linearis Rydb. non Greene – not accepted
  Macronema obovatum Rydb. non Haplopappus obovatus Phil. – not accepted
  Allium fibrosum Rydb., non Regel – not accepted
  Machaeranthera angustifolia Rydb. non Woot. & Standl. – not accepted
  Physaria kingii ssp. utahensis (Rydb.) O'Kane – accepted – Utah bladderpod
  Physaria ovalifolia (Rydb.) O'Kane & Al-Shehbaz – accepted – roundleaf bladderpod
  Physaria ovalifolia ssp. ovalifolia (Rydb.) O'Kane & Al-Shehbaz – accepted – roundleaf bladderpod
  Physaria reediana ssp. spatulata (Rydb.) O'Kane & Al-Shehbaz – not accepted
  Helianthus pauciflorus ssp. subrhomboideus (Rydb.) O. Spring & E.E. Schill. – accepted – stiff sunflower
  Descurainia brachycarpa var. nelsonii (Rydb.) O.E. Schulz – not accepted
  Salix glauca var. seemanii (Rydb.) Ostenf. – not accepted
  Castilleja applegatei var. viscida (Rydb.) Ownbey – not accepted
  Gaura neomexicana ssp. coloradensis (Rydb.) P.H. Raven & D.P. Greg. – not accepted – Colorado beeblossom, Colorado butterfly plant
  Parnassia cirrata var. intermedia (Rydb.) P.K. Holmgren & N.H. Holmgren – accepted – fringed grass of Parnassus
  Festuca rubra ssp. vallicola (Rydb.) Pavlick – accepted – red fescue
  Ambrosia linearis (Rydb.) Payne – accepted – streaked bur ragweed, streaked burr ragweed
  Caulanthus lasiophyllus var. utahensis (Rydb.) Payson – not accepted
  Cryptantha pustulosa (Rydb.) Payson – not accepted
  Lesquerella alpina var. spathulata (Rydb.) Payson – not accepted
  Lesquerella alpina var. spatulata (Rydb.) Payson – not accepted – alpine bladderpod
  Tetradymia canescens var. inermis (Rydb.) Payson – not accepted
  Cirsium butleri (Rydb.) Petr. – not accepted
  Cirsium canovirens (Rydb.) Petr. – not accepted – graygreen thistle
  Cirsium coloradense ssp. acaulescens (Rydb.) Petr. – not accepted
  Cirsium floccosum (Rydb.) Petr. – not accepted
  Cirsium kelseyi (Rydb.) Petr. – not accepted
  Cirsium lacerum (Rydb.) Petr. – not accepted
  Cirsium olivescens (Rydb.) Petr. – not accepted – summer thistle
  Cirsium osterhoutii (Rydb.) Petr. – not accepted – Osterhout's thistle
  Cirsium perplexans (Rydb.) Petr. – accepted – Rocky Mountain thistle, spring thistle
  Cirsium polyphyllum (Rydb.) Petr. – not accepted
  Cirsium tracyi (Rydb.) Petr. – accepted – Tracy's thistle
  Cirsium tweedyi (Rydb.) Petr. – not accepted
  Oenothera biennis var. strigosa (Rydb.) Piper – not accepted
  Claytonia perfoliata ssp. perfoliata var. utahensis (Rydb.) Poelln. – not accepted
  Claytonia perfoliata var. utahensis (Rydb.) Poelln. – not accepted
  Aster X batesii Rydb. (pro sp.) – not accepted – Bates' aster
  Aster X woldenii Rydb. (pro sp.) – not accepted – Wolden's aster
  Balsamorhiza X tomentosa Rydb. (pro sp.) – accepted – tomentose balsamroot
  Hypericum X mitchellianum Rydb. (pro sp.) – accepted – Blue Ridge St. Johnswort
  Poa X nematophylla Rydb. (pro sp.) – accepted
  Populus X acuminata Rydb. (pro sp.) – accepted – lanceleaf cottonwood
  Quercus X pauciloba Rydb. (pro sp.) – not accepted – wavyleaf oak
  Rosa X collaris Rydb. (pro sp.) – accepted
  Rubus X ostryifolius Rydb. (pro sp.) – accepted – highbush blackberry
  Salix X waghornei Rydb. (pro sp.) – accepted – Waghorn's willow
  Salix X wyomingensis Rydb. (pro sp.) – accepted
  Spiraea X subcanescens Rydb. (pro sp.) – accepted – spirea
  Atriplex X odontoptera Rydb. (pro. sp.) – accepted
  Eriogonum X nebraskense Rydb. (pro. sp.) – accepted – Nebraska buckwheat
  Iva ambrosiifolia ssp. lobata (Rydb.) R. C. Jacks. – not accepted
  Iva ambrosiifolia var. lobata (Rydb.) R. C. Jacks. – not accepted
  Androsace septentrionalis var. puberulenta (Rydb.) R. Knuth – not accepted
  Claytonia lanceolata var. rosea (Rydb.) R.J. Davis – not accepted
  Lupinus argenteus var. macounii (Rydb.) R.J. Davis – not accepted
  Lupinus argenteus var. stenophyllus (Rydb.) R.J. Davis – not accepted
  Mentzelia sinuata (Rydb.) R.J. Hill – accepted – leechleaf blazingstar
  Tephrosia mohrii (Rydb.) R.K. Godfrey – accepted – pineland hoary-pea
  Rayjacksonia annua (Rydb.) R.L. Hartm. & M.A. Lane – accepted – viscid tansyaster
  Eremogone congesta var. cephaloidea (Rydb.) R.L. Hartm. & Rabeler – accepted – sharptip sandwort
  Platanthera elegans ssp. maritima (Rydb.) R.M. Bateman – accepted
  Platanthera elongata (Rydb.) R.M. Bateman – accepted
  Platanthera leptopetala (Rydb.) R.M. Bateman – accepted
  Ericameria linearis (Rydb.) R.P. Roberts & Urbatsch – accepted – whitestem goldenbush
  Geum macrophyllum var. perincisum (Rydb.) Raup – accepted – large-leaf avens, largeleaf avens
  Physocarpus bracteatus (Rydb.) Rehder – accepted
  Eriogonum pauciflorum var. nebraskense (Rydb.) Reveal – not accepted – Nebraska buckwheat
  Arabis fendleri var. spatifolia (Rydb.) Rollins – not accepted – spoonleaf rockcress
  Draba breweri var. cana (Rydb.) Rollins – not accepted – cushion draba, lanceolate draba, hoary whitlowgrass, lanceleaf draba
  Hedysarum boreale var. cinerascens (Rydb.) Rollins – not accepted
  Hedysarum boreale var. utahense (Rydb.) Rollins – not accepted
  Stanleya tomentosa var. runcinata (Rydb.) Rollins – not accepted – woolly princesplume
  Boykinia heucheriformis (Rydb.) Rosend. – not accepted – alumroot brookfoam
  Heuchera pilosissima var. hemisphaerica (Rydb.) Rosend. – not accepted – seaside alumroot
  Heuchera sanguinea var. pulchra (Rydb.) Rosend. – not accepted – coralbells
  Mitella trifida var. violacea (Rydb.) Rosend. – not accepted – threeparted miterwort
  Heuchera longiflora var. aceroides (Rydb.) Rosend., Butters & Lakela – not accepted
  Heuchera micrantha var. diversifolia (Rydb.) Rosend., Butters & Lakela – accepted – crevice alumroot
  Heuchera parvifolia var. flavescens (Rydb.) Rosend., Butters & Lakela – not accepted – littleleaf alumroot
  Clematis occidentalis ssp. grosseserrata (Rydb.) Roy L. Taylor & MacBryde – not accepted
  Holodiscus discolor ssp. franciscanus (Rydb.) Roy L. Taylor & MacBryde – not accepted
  Oenothera depressa ssp. strigosa (Rydb.) Roy L. Taylor & MacBryde – not accepted
  Achillea alpicola (Rydb.) Rydb. – not accepted
  Aira alpicola (Rydb.) Rydb. – not accepted
  Aira pungens (Rydb.) Rydb. – not accepted
  Anticlea coloradensis (Rydb.) Rydb. – not accepted
  Arabidopsis richardsonii (Rydb.) Rydb. – not accepted
  Chamaesyce albicaulis (Rydb.) Rydb. – not accepted
  Drymocallis convallaria (Rydb.) Rydb. – accepted – cream cinquefoil
  Drymocallis pseudorupestris (Rydb.) Rydb. – accepted – sticky cinquefoil
  Drymocallis pseudorupestris var. pseudorupestris (Rydb.) Rydb. – accepted – sticky cinquefoil
  Drymocallis rhomboidea (Rydb.) Rydb. – accepted – globose drymocallis, Siskiyou drymocallis
  Fragaria australis (Rydb.) Rydb. – not accepted
  Frasera angustifolia (Rydb.) Rydb. – not accepted
  Frasera stenosepala (Rydb.) Rydb. – not accepted
  Horkeliella (Rydb.) Rydb. – accepted – false horkelia
  Horkeliella congdonis (Rydb.) Rydb. – accepted – Congdon's false horkelia
  Ivesia argyrocoma (Rydb.) Rydb. – accepted – silverhair mousetail, silver-haired ivesia
  Ivesia argyrocoma var. argyrocoma (Rydb.) Rydb. – accepted – silverhair mousetail
  Ivesia sericoleuca (Rydb.) Rydb. – accepted – Plumas ivesia, Plumas mousetail
  Lonicera glaucescens (Rydb.) Rydb. – not accepted
  Phacelia ciliosa (Rydb.) Rydb. – not accepted
  Phymosia crandallii (Rydb.) Rydb. – not accepted
  Phymosia grandiflora (Rydb.) Rydb. – not accepted
  Potentilla divisa (Rydb.) Rydb. – not accepted
  Potentilla pedersenii (Rydb.) Rydb. – accepted
  Potentilla propinqua (Rydb.) Rydb. – not accepted
  Potentilla quinquefolia (Rydb.) Rydb. – not accepted
  Potentilla viscidula (Rydb.) Rydb. – not accepted
  Psoralidium stenophyllum (Rydb.) Rydb. – not accepted
  Sphenopholis intermedia (Rydb.) Rydb. – accepted – slender wedgescale, slender wedgegrass
  Spiranthes ochroleuca (Rydb.) Rydb. – accepted – yellow nodding ladies'-tresses, yellow nodding lady's tresses
  Telesonix heucheriformis (Rydb.) Rydb. – accepted – alumroot brookfoam
  Tesseranthium angustifolium (Rydb.) Rydb. – not accepted
  Toxicoscordion gramineum (Rydb.) Rydb. – not accepted
  Wahlbergella striata (Rydb.) Rydb. – not accepted
  Xanthoxalis coloradensis (Rydb.) Rydb. – not accepted
  Lewisia congdonii (Rydb.) S. Clay – accepted – Congdon's lewisia
  Eriogonum microthecum var. idahoense (Rydb.) S. Stokes – not accepted
  Eriogonum spathulatum ssp. spathuiforme (Rydb.) S. Stokes – not accepted
  Eriogonum ovalifolium ssp. chrysops (Rydb.) S. Stokes ex M. Peck – not accepted
  Ambrosia psilostachya var. californica (Rydb.) S.F. Blake – not accepted
  Aster commutatus var. crassulus (Rydb.) S.F. Blake – not accepted
  Chimaphila umbellata var. acuta (Rydb.) S.F. Blake – not accepted
  Chimaphila umbellata var. occidentalis (Rydb.) S.F. Blake – not accepted
  Chrysothamnus greenei var. filifolius (Rydb.) S.F. Blake – not accepted
  Gaillardia arizonica var. pringlei (Rydb.) S.F. Blake – not accepted – Pringle's blanketflower
  Haplopappus clementis (Rydb.) S.F. Blake – not accepted
  Haplopappus spinulosus var. glaberrimus (Rydb.) S.F. Blake – not accepted
  Haplopappus spinulosus var. turbinellus (Rydb.) S.F. Blake – not accepted
  Artemisia norvegica var. comata (Rydb.) S.L. Welsh – not accepted
  Cirsium undulatum var. tracyi (Rydb.) S.L. Welsh – not accepted – Tracy's thistle, gray thistle, wavyleaf thistle
  Ipomopsis tridactyla (Rydb.) S.L. Welsh – not accepted – Cedar Breaks gilia
  Lupinus pusillus var. rubens (Rydb.) S.L. Welsh – not accepted
  Lupinus sericeus var. jonesii (Rydb.) S.L. Welsh – not accepted
  Lupinus sericeus var. marianus (Rydb.) S.L. Welsh – not accepted
  Papaver radicatum var. pygmaeum (Rydb.) S.L. Welsh – not accepted
  Psoralea lanceolata var. stenostachys (Rydb.) S.L. Welsh – not accepted
  Psoralidium lanceolatum var. stenophyllum (Rydb.) S.L. Welsh – not accepted
  Psoralidium lanceolatum var. stenostachys (Rydb.) S.L. Welsh – not accepted
  Thelypodiopsis sagittata var. ovalifolium (Rydb.) S.L. Welsh – not accepted
  Trifolium dasyphyllum var. uintense (Rydb.) S.L. Welsh – not accepted
  Trifolium parryi var. montanense (Rydb.) S.L. Welsh – not accepted
  Potentilla concinna var. bicrenata (Rydb.) S.L. Welsh & B.C. Johnst. – not accepted – elegant cinquefoil, red cinquefoil
  Potentilla concinna var. modesta (Rydb.) S.L. Welsh & B.C. Johnst. – not accepted – red cinquefoil
  Potentilla concinna var. proxima (Rydb.) S.L. Welsh & B.C. Johnst. – accepted – red cinquefoil, elegant cinquefoil
  Potentilla glandulosa var. micropetala (Rydb.) S.L. Welsh & B.C. Johnst. – not accepted
  Potentilla pensylvanica var. paucijuga (Rydb.) S.L. Welsh & B.C. Johnst. – not accepted – Pennsylvania cinquefoil
  Thelypodium sagittatum var. ovalifolium (Rydb.) S.L. Welsh & Reveal – not accepted
  Philadelphus lewisii var. angustifolius (Rydb.) S.Y. Hu – not accepted – Lewis' mockorange
  Philadelphus lewisii var. helleri (Rydb.) S.Y. Hu – not accepted – Heller's mockorange
  Philadelphus lewisii var. platyphyllus (Rydb.) S.Y. Hu – not accepted – Lewis' mockorange
  Philadelphus microphyllus var. minutus (Rydb.) S.Y. Hu – not accepted – littleleaf mockorange
  Philadelphus occidentalis var. minutus (Rydb.) S.Y. Hu – not accepted – western mock orange, Grand Canyon mock orange, western mockorange
  Betula papyrifera var. subcordata (Rydb.) Sarg. – not accepted
  Heterotheca barbata (Rydb.) Semple – accepted – Spokane false goldenaster
  Heterotheca fulcrata var. amplifolia (Rydb.) Semple – accepted – rockyscree false goldenaster
  Heterotheca stenophylla var. angustifolia (Rydb.) Semple – accepted – stiffleaf false goldenaster
  Heterotheca villosa var. angustifolia (Rydb.) Semple – not accepted
  Heterotheca villosa var. ballardii (Rydb.) Semple – accepted – hairy false goldenaster
  Heterotheca villosa var. depressa (Rydb.) Semple – accepted – hairy false goldenaster
  Solidago altissima ssp. gilvocanescens (Rydb.) Semple – accepted – Great Plains late goldendrod, shorthair goldenrod
  Solidago altissima var. gilvocanescens (Rydb.) Semple – not accepted
  Platanthera purpurascens (Rydb.) Sheviak & W.F. Jenn. – accepted – purple-petal bog orchid
  Argemone munita var. rotundata (Rydb.) Shinners – not accepted
  Delphinium virescens var. wootonii (Rydb.) Shinners – not accepted
  Machaeranthera annua (Rydb.) Shinners – not accepted – viscid tansyaster
  Machaeranthera phyllocephala var. annua (Rydb.) Shinners – not accepted
  Palafoxia texana var. macrolepis (Rydb.) Shinners – not accepted
  Perityle rotundata (Rydb.) Shinners – not accepted
  Thelesperma filifolium var. intermedium (Rydb.) Shinners – not accepted – stiff greenthread
  Solidago gilvocanescens (Rydb.) Smyth – not accepted
  Juncus balticus ssp. ater (Rydb.) Snogerup – accepted
  Potentilla fastigiata var. permollis (Rydb.) Soják – not accepted
  Potentilla glaucophylla var. perdissecta (Rydb.) Soják – accepted – mountainmeadow cinquefoil
  Potentilla pectinisecta var. comosa (Rydb.) Soják – not accepted
  Potentilla rubricaulis var. paucijuga (Rydb.) Soják – not accepted
  Festuca ovina ssp. saximontana (Rydb.) St.-Yves – not accepted
  Mirabilis lanceolata (Rydb.) Standl. – not accepted
  Oxybaphus lanceolatus (Rydb.) Standl. – not accepted
  Psoralea brachypus (Rydb.) Standl. – not accepted
  Psoralea trinervata (Rydb.) Standl. – not accepted
  Fragaria virginiana ssp. platypetala (Rydb.) Staudt – accepted – Virginia strawberry
  Antennaria neglecta var. campestris (Rydb.) Steyerm. – not accepted
  Grindelia nana var. integerrima (Rydb.) Steyerm. – not accepted – Idaho gumweed
  Grindelia squarrosa var. serrulata (Rydb.) Steyerm. – not accepted – gumweed, curlytop gumweed, rosinweed, tarweed, curlycup gumweed, curly-cup gumweed
  Dyssodia pentachaeta var. puberula (Rydb.) Strother – not accepted
  Thymophylla pentachaeta var. puberula (Rydb.) Strother – accepted – fiveneedle pricklyleaf
  Ambrosia salsola var. pentalepis (Rydb.) Strother & B.G. Baldw. – not accepted
  Rorippa curvipes var. integra (Rydb.) Stuckey – not accepted
  Rorippa palustris var. clavata (Rydb.) Stuckey – not accepted
  Neottia nephrophylla (Rydb.) Szlach. – not accepted
  Thelesperma subnudum var. marginatum (Rydb.) T.E. Melchert ex Cronquist – not accepted – Navajo tea, greenthread, Navajo-tea
  Braya novae-angliae (Rydb.) T.J. Sřrensen – not accepted
  Machaeranthera coloradoensis var. brandegeei (Rydb.) T.J. Watson ex R.L. Hartm. – not accepted – Brandegee's tansyaster
  Senecio integerrimus var. scribneri (Rydb.) T.M. Barkley – accepted – Scribner's ragwort
  Senecio foetidus var. hydrophiloides (Rydb.) T.M. Barkley ex Cronquist – not accepted
  Potentilla arguta var. convallaria (Rydb.) Th. Wolf – not accepted
  Potentilla blasckeana var. permollis (Rydb.) Th. Wolf – not accepted
  Potentilla gracilis var. hallii (Rydb.) Th. Wolf – not accepted
  Potentilla pensylvanica var. atrovirens (Rydb.) Th. Wolf – not accepted – Pennsylvania cinquefoil
  Potentilla rubripes var. saximontana (Rydb.) Th. Wolf – not accepted
  Lepidium densiflorum var. elongatum (Rydb.) Thell. – not accepted – tall pepperweed
  Astragalus amphioxys var. melancalyx (Rydb.) Tidestr. – not accepted
  Astragalus amphioxys var. melanocalyx (Rydb.) Tidestr. – not accepted
  Astragalus cinerascens (Rydb.) Tidestr. – not accepted
  Astragalus datilensis (Rydb.) Tidestr. – not accepted
  Astragalus macgregorii (Rydb.) Tidestr. – not accepted
  Astragalus stictocarpus (Rydb.) Tidestr. – not accepted
  Astragalus tehachapiensis (Rydb.) Tidestr. – not accepted
  Astragalus tehatchapiensis (Rydb.) Tidestr. – not accepted
  Stellaria palmeri (Rydb.) Tidestr. – not accepted
  Psoralea lanceolata var. stenophylla (Rydb.) Toft & S.L. Welsh – not accepted
  Glandularia pumila (Rydb.) Umber – accepted – pink verbena, pink mock vervain
  Ipomopsis frutescens (Rydb.) V.E. Grant – not accepted
  Ipomopsis polyantha (Rydb.) V.E. Grant – accepted – Pagosa ipomopsis, Pagosa skyrocket
  Ipomopsis roseata (Rydb.) V.E. Grant – accepted – rosy ipomopsis
  Ipomopsis tenuituba (Rydb.) V.E. Grant – accepted – slender-tube skyrocket, slendertube skyrocket
  Ipomopsis tenuituba ssp. tenuituba (Rydb.) V.E. Grant – accepted – slendertube skyrocket
  Ipomopsis aggregata ssp. candida (Rydb.) V.E. Grant & A.D. Grant – accepted – scarlet skyrocket, scarlet gilia
  Heterotheca horrida (Rydb.) V.L. Harms – not accepted
  Rorippa obtusa var. integra (Rydb.) Vict. – not accepted
  Rosa X palustriformis (Rydb.) Voss – accepted – rose
  Oenothera villosa ssp. strigosa (Rydb.) W. Dietr. & P.H. Raven – accepted – hairy evening primrose, hairy evening-primrose, hairy eveningprimrose
  Prunus pensylvanica ssp. corymbulosa (Rydb.) W. Wight – not accepted
  Prunus pensylvanica var. corymbulosa (Rydb.) W. Wight – not accepted
  Acomastylis rossii ssp. turbinata (Rydb.) W.A. Weber – not accepted
  Agrostis idahoensis var. bakeri (Rydb.) W.A. Weber – not accepted – Baker's bentgrass
  Aletes latiloba (Rydb.) W.A. Weber – not accepted
  Aletes longiloba (Rydb.) W.A. Weber – not accepted
  Alsinanthe macrantha (Rydb.) W.A. Weber – not accepted
  Antennaria pulcherrima ssp. anaphaloides (Rydb.) W.A. Weber – not accepted
  Boechera fendleri var. spatifolia (Rydb.) W.A. Weber – not accepted
  Boechera selbyi (Rydb.) W.A. Weber – not accepted
  Cymopterus longilobus (Rydb.) W.A. Weber – not accepted
  Delphinium ramosum var. alpestre (Rydb.) W.A. Weber – not accepted
  Gentianella strictiflora (Rydb.) W.A. Weber – not accepted
  Geranium viscosissimum ssp. nervosum (Rydb.) W.A. Weber – not accepted
  Ipomopsis candida (Rydb.) W.A. Weber – not accepted
  Packera oodes (Rydb.) W.A. Weber – not accepted
  Poa nemoralis ssp. interior (Rydb.) W.A. Weber – not accepted – inland bluegrass
  Ptilagrostis porteri (Rydb.) W.A. Weber – accepted – Porter's false needlegrass
  Seriphidium tridentatum ssp. vaseyanum (Rydb.) W.A. Weber – not accepted
  Seriphidium tripartitum (Rydb.) W.A. Weber – not accepted
  Seriphidium vaseyanum (Rydb.) W.A. Weber – not accepted
  Packera crocata (Rydb.) W.A. Weber & Á. Löve – accepted – saffron ragwort
  Packera millelobata (Rydb.) W.A. Weber & Á. Löve – accepted – Uinta ragwort
  Packera pseudaurea (Rydb.) W.A. Weber & Á. Löve – accepted – falsegold groundsel
  Packera pseudaurea var. pseudaurea (Rydb.) W.A. Weber & Á. Löve – accepted – falsegold groundsel
  Packera sanguisorboides (Rydb.) W.A. Weber & Á. Löve – accepted – burnet ragwort
  Packera tridenticulata (Rydb.) W.A. Weber & Á. Löve – accepted – threetooth ragwort
  Rosa woodsii var. arizonica (Rydb.) W.C. Martin & C.R. Hutchins – not accepted
  Rosa woodsii var. granulifera (Rydb.) W.C. Martin & C.R. Hutchins – not accepted
  Rosa carolina ssp. subserrulata (Rydb.) W.H. Lewis – accepted
  Rosa woodsii ssp. arizonica (Rydb.) W.H. Lewis & Ertter – accepted – Woods' Arizona rose
  Vauquelinia corymbosa ssp. angustifolia (Rydb.) W.J. Hess & Henrickson – accepted – slimleaf rosewood
  Oenothera coloradensis (Rydb.) W.L. Wagner & Hoch – accepted – New Mexico beeblossom
  Oenothera coloradensis ssp. coloradensis (Rydb.) W.L. Wagner & Hoch – accepted – Colorado beeblossom, Colorado butterfly plant
  Oenothera caespitosa ssp. macroglottis (Rydb.) W.L. Wagner, Stockh. & W.M. Klein – not accepted – tufted evening primrose, tufted evening-primrose
  Oenothera cespitosa ssp. macroglottis (Rydb.) W.L. Wagner, Stockh. & W.M. Klein – accepted – tufted evening primrose, tufted eveningprimrose
  Zigadenus venenosus var. gramineus (Rydb.) Walsh ex M. Peck – not accepted – grassy deathcamas, deathcamas
  Haplopappus phyllocephalus var. annuus (Rydb.) Waterf. – not accepted
  Physalis angulata var. pendula (Rydb.) Waterf. – not accepted
  Physalis arenicola var. ciliosa (Rydb.) Waterf. – not accepted
  Physalis crassifolia var. versicolor (Rydb.) Waterf. – accepted – yellow nightshade groundcherry
  Physalis foetens var. neomexicana (Rydb.) Waterf. – not accepted
  Physalis hederifolia var. comata (Rydb.) Waterf. – accepted – ivyleaf groundcherry, heartleaf groundcherry
  Physalis virginiana var. texana (Rydb.) Waterf. – accepted – Texan groundcherry
  Physalis subulata var. neomexicana (Rydb.) Waterf. ex Kartesz & Gandhi – not accepted – New Mexican groundcherry, Chihuahuan groundcherry
  Petalostemon adenopodus (Rydb.) Wemple – not accepted
  Leptodactylon pungens ssp. brevifolium (Rydb.) Wherry – not accepted
  Phlox albomarginata ssp. diapensioides (Rydb.) Wherry – accepted – whitemargin phlox
  Phlox alyssifolia ssp. collina (Rydb.) Wherry – accepted – alyssumleaf phlox
  Phlox diffusa ssp. scleranthifolia (Rydb.) Wherry – accepted – spreading phlox
  Phlox multiflora ssp. costata (Rydb.) Wherry – not accepted
  Dalea neomexicana ssp. mollissima (Rydb.) Wiggins – not accepted
  Eriophyllum wallacei ssp. australe (Rydb.) Wiggins – not accepted
  Iliamna crandallii (Rydb.) Wiggins – accepted – Crandall's wild hollyhock
  Iliamna grandiflora (Rydb.) Wiggins – accepted – large-flowered wild hollyhock, wild hollyhock, largeflower wild hollyhock
  Salix glauca var. niphoclada (Rydb.) Wiggins – not accepted
  Eritrichium elongatum (Rydb.) Wight – not accepted
  Amorpha herbacea var. floridana (Rydb.) Wilbur – not accepted
  Ipomopsis spicata ssp. orchidacea var. cephaloidea (Rydb.) Wilken & R.L. Hartm. – not accepted – orchid ipomopsis
  Ipomopsis spicata ssp. tridactyla (Rydb.) Wilken & R.L. Hartm. – accepted – spiked ipomopsis
  Ipomopsis spicata var. cephaloidea (Rydb.) Wilken & R.L. Hartm. – accepted – orchid ipomopsis
  Boechera spatifolia (Rydb.) Windham & Al-Shehbaz – accepted – spoonleaf rockcress
  Astragalus proximus (Rydb.) Wooton & Standl. – accepted – Aztec milkvetch
  Nuttallia laciniata (Rydb.) Wooton & Standl. – not accepted
  Deschampsia caespitosa var. alpicola (Rydb.) Á. & D. Löve & Kapoor – not accepted
  Elytrigia smithii (Rydb.) Á. Löve – not accepted
  Pascopyrum smithii (Rydb.) Á. Löve – not accepted – western wheatgrass, pubescent wheatgrass
  Chamerion subdentatum (Rydb.) Á. Löve & D. Löve – not accepted
  Lidia obtusiloba (Rydb.) Á. Löve & D. Löve – not accepted
  Listera cordata ssp. nephrophylla (Rydb.) Á. Löve & D. Löve – not accepted
  Arenaria subcongesta (S. Watson) Rydb. – not accepted
  Castilleja pilosa (S. Watson) Rydb. – accepted – parrothead Indian paintbrush, hairy paintbrush
  Castilleja pilosa var. pilosa (S. Watson) Rydb. – accepted – parrothead Indian paintbrush
  Cheirinia inconspicua (S. Watson) Rydb. – not accepted
  Chenopodium oblongifolium (S. Watson) Rydb. – not accepted
  Chlorocrambe hastata (S. Watson) Rydb. – accepted – spearhead
  Elmera racemosa (S. Watson) Rydb. – accepted – yellow coralbells
  Elmera racemosa var. racemosa (S. Watson) Rydb. – not accepted – yellow coralbells
  Ericameria cervina (S. Watson) Rydb. – accepted – deer goldenbush, deer heath-goldenrod, deer heathgoldenrod
  Erocallis triphylla (S. Watson) Rydb. – not accepted
  Fragaria glauca (S. Watson) Rydb. – not accepted
  Hesperochloa kingii (S. Watson) Rydb. – not accepted
  Hesperochloa kingii var. kingii (S. Watson) Rydb. – not accepted
  Horkelia baileyi (S. Watson) Rydb. – not accepted
  Horkeliella purpurascens (S. Watson) Rydb. – accepted – purple false horkelia
  Ivesia setosa (S. Watson) Rydb. – accepted
  Kelseya uniflora (S. Watson) Rydb. – accepted – oneflower kelseya
  Kelseyi (S. Watson) Rydb. – not accepted
  Kelseyi uniflora (S. Watson) Rydb. – not accepted
  Kochia vestita (S. Watson) Rydb. – not accepted
  Lappula redowskii var. occidentalis (S. Watson) Rydb. – not accepted
  Leucocraspedum albomarginatum (S. Watson) Rydb. – not accepted
  Limnorchis sparsiflora (S. Watson) Rydb. – not accepted
  Lupinus glabratus (S. Watson) Rydb. – not accepted
  Pediomelum californicum (S. Watson) Rydb. – accepted – California Indian breadroot
  Pediomelum castoreum (S. Watson) Rydb. – accepted – Beaver Indian breadroot, Beaver Dam scurfpea
  Pediomelum mephiticum (S. Watson) Rydb. – accepted – skunktop
  Pediomelum reverchonii (S. Watson) Rydb. – accepted – rock Indian breadroot, rock scurfpea
  Piperia cooperi (S. Watson) Rydb. – not accepted – Cooper's rein orchid
  Potentilla decurrens (S. Watson) Rydb. – not accepted
  Potentilla multisecta (S. Watson) Rydb. – accepted – featherleaf cinquefoil, alpine cinquefoil
  Rorippa alpina (S. Watson) Rydb. – accepted – alpine yellowcress
  Streptanthella longirostris (S. Watson) Rydb. – accepted – longbeak fiddle mustard, longbeak streptanthella
  Toxicoscordion venenosum (S. Watson) Rydb. – accepted – meadow deathcamas
  Toxicoscordion venenosum var. venenosum (S. Watson) Rydb. – accepted – meadow deathcamas
  Viola venosa (S. Watson) Rydb. – not accepted
  Wahlbergella kingii (S. Watson) Rydb. – not accepted
  Wahlbergella montana (S. Watson) Rydb. – not accepted
  Wahlbergella parryi (S. Watson) Rydb. – not accepted
  Aster commutatus var. polycephalus S.F. Blake, non Aster polycephalus Rydb. – not accepted
  Sabina scopulorum (Sarg.) Rydb. – not accepted
  Perityle spilanthoides (Sch. Bip.) Rydb. – not accepted
  Geum oregonense (Scheutz) Rydb. – not accepted
  Veratrum eschscholtzianum (Schult. & Schult. f.) Rydb. ex A. Heller – not accepted
  Agropyron andinum (Scribn. & J.G. Sm.) Rydb. – not accepted
  Agropyron inerme (Scribn. & J.G. Sm.) Rydb. – not accepted
  Agropyron latiglume (Scribn. & J.G. Sm.) Rydb. – not accepted
  Agropyron molle (Scribn. & J.G. Sm.) Rydb. – not accepted
  Agropyron palmeri (Scribn. & J.G. Sm.) Rydb. – not accepted
  Hordeum depressum (Scribn. & J.G. Sm.) Rydb. – accepted – dwarf barley
  Poa pseudopratensis Scribn. & Rydb. – not accepted
  Poa pratensis var. pseudopratensis (Scribn. & Rydb.) M.E. Jones – not accepted
  Aira curtifolia (Scribn.) Rydb. – not accepted
  Graphephorum brandegeei (Scribn.) Rydb. – not accepted
  Graphephorum shearii (Scribn.) Rydb. – not accepted
  Muhlenbergia simplex (Scribn.) Rydb. – not accepted
  Muhlenbergia thurberi (Scribn.) Rydb. – accepted – Thurber's muhly, Thurber muhly
  Physalis pruinosa sensu Rydb. – not accepted
  Argentina anserina var. concolor (Ser.) Rydb. – not accepted
  Bromus lanatipes (Shear) Rydb. – accepted – woolly brome
  Bromus latior (Shear) Rydb. – not accepted
  Bromus paniculatus (Shear) Rydb. – not accepted
  Homalobus vexilliflexus (Sheldon) Rydb. – not accepted
  Baptisia vespertina Small ex Rydb. – not accepted
  Chorizanthe spathulata Small ex Rydb. – not accepted
  Clematis versicolor Small ex Rydb. – accepted – manycolored virginsbower, pale leather flower
  Cracca curtissii Small ex Rydb. – not accepted
  Eriogonum ochroleucum Small ex Rydb. – not accepted
  Eriogonum polyphyllum Small ex Rydb. – not accepted
  Gaillardia rigida Small ex Rydb. – not accepted
  Polygonum paronychioides Small ex Rydb. – not accepted – knotweed
  Polygonum unifolium Small ex Rydb. – not accepted
  Saxifraga rydbergii Small ex Rydb. – not accepted
  Chorizanthe brevicornu var. spathulata (Small ex Rydb.) C.L. Hitchc. – accepted – brittle spineflower
  Saxifraga hieraciifolia var. rydbergii (Small ex Rydb.) Engl. & Irmsch. – not accepted
  Toxicodendron radicans var. rydbergii (Small ex Rydb.) Erskine – not accepted
  Toxicodendron rydbergii (Small ex Rydb.) Greene – accepted – poison ivy, western poison ivy
  Tephrosia angustissima var. curtissii (Small ex Rydb.) Isely – not accepted – Curtiss' hoarypea
  Eriogonum ovalifolium var. ochroleucum (Small ex Rydb.) M. Peck – accepted – cushion buckwheat
  Eriogonum flavum var. polyphyllum (Small ex Rydb.) M.E. Jones – not accepted – alpine golden buckwheat
  Chorizanthe brevicornu ssp. spathulata (Small ex Rydb.) Munz – not accepted
  Rhus radicans var. rydbergii (Small ex Rydb.) Rehder – not accepted
  Eriogonum ovalifolium ssp. ochroleucum (Small ex Rydb.) S. Stokes – not accepted
  Tephrosia curtissii (Small ex Rydb.) Shinners – accepted – Curtiss' hoarypea
  Viorna versicolor (Small ex Rydb.) Small – not accepted
  Coriflora versicolor (Small ex Rydb.) W.A. Weber – not accepted
  Claytonia robusta (Somes) Rydb. – not accepted
  Piperia unalascensis (Spreng.) Rydb. – not accepted – Alaska bog orchid, Piperia de Alaska, Alaskan rein-orchid, pipérie d'Unalaska, Alaska rein orchid, slender-spire orchid
  Astragalus ventosus Suksd. ex Rydb. – not accepted
  Astragalus ventrosus Suksd. ex Rydb. – not accepted
  Plectritis macroptera (Suksd.) Rydb. – not accepted
  Bothriochloa saccharoides (Sw.) Rydb. – accepted – silver bluestem
  Bothriochloa saccharoides ssp. saccharoides (Sw.) Rydb. – not accepted
  Bothriochloa saccharoides var. saccharoides (Sw.) Rydb. – accepted
  Triphora trianthophora (Sw.) Rydb. – not accepted – three birds orchid, threebirds
  Triphora trianthophora var. trianthophora (Sw.) Rydb. – not accepted – threebirds
  Triphora trianthophoros (Sw.) Rydb. – accepted – threebirds, three birds orchid
  Triphora trianthophoros var. trianthophoros (Sw.) Rydb. – accepted – threebirds
  Juncoides intermedium (Thuill.) Rydb. – not accepted
  Osmorhiza aristata (Thunb.) Rydb. – accepted
  Muhlenbergia filiformis (Thurb. ex S. Watson) Rydb. – accepted – pullup muhly
  Muhlenbergia filiformis var. filiformis (Thurb. ex S. Watson) Rydb. – accepted – pullup muhly
  Sporobolus filiformis (Thurb. ex S. Watson) Rydb. – not accepted
  Sporobolus flexuosus (Thurb. ex Vasey) Rydb. – accepted – mesa dropseed
  Ceanothus pubescens (Torr. & A. Gray ex S. Watson) Rydb. ex Small – not accepted
  Artemisia elatior (Torr. & A. Gray) Rydb. – not accepted
  Aster stricticaulis (Torr. & A. Gray) Rydb. – not accepted
  Dysodiopsis tagetoides (Torr. & A. Gray) Rydb. – accepted – false dogfennel, marygold dogweed
  Eupatorium texense (Torr. & A. Gray) Rydb. – not accepted
  Hamosa leptocarpa (Torr. & A. Gray) Rydb. – not accepted
  Holcophacos distortus (Torr. & A. Gray) Rydb. – not accepted
  Liatris compacta (Torr. & A. Gray) Rydb. – accepted – scaly blazing star
  Meibomia pubens (Torr. & A. Gray) Rydb. – not accepted
  Orbexilum gracile (Torr. & A. Gray) Rydb. – not accepted
  Orbexilum stipulatum (Torr. & A. Gray) Rydb. – accepted – largestipule leather-root
  Pediomelum rhombifolium (Torr. & A. Gray) Rydb. – accepted – Gulf Indian breadroot, roundleaf scurfpea
  Pediomelum subacaule (Torr. & A. Gray) Rydb. – accepted – whiterim scurfpea
  Pediomelum subacaulis (Torr. & A. Gray) Rydb. – not accepted
  Phymosia acerifolia (Torr. & A. Gray) Rydb. – not accepted
  Psoralidium linearifolium (Torr. & A. Gray) Rydb. – not accepted
  Quercus gunnisonii (Torr. & A. Gray) Rydb. – not accepted
  Valeriana uliginosa (Torr. & A. Gray) Rydb. – not accepted – mountain valerian
  Caryopitys monophylla (Torr. & Frém.) Rydb. – not accepted
  Lysias hookeriana (Torr. ex A. Gray) Rydb. – not accepted
  Muhlenbergia cuspidata (Torr. ex Hook.) Rydb. – accepted – plains muhly
  Chimaphila maculata var. dasystemma (Torr. ex Rydb.) Kearney & Peebles – not accepted
  Psorothamnus polydenius (Torr. ex S. Watson) Rydb. – accepted – Nevada dalea
  Psorothamnus polydenius var. polydenius (Torr. ex S. Watson) Rydb. – accepted – Nevada dalea, Nevada smokebush
  Atriplex suckleyi (Torr.) Rydb. – not accepted – Suckley's orach
  Comarella multifoliolata (Torr.) Rydb. – not accepted
  Distichlis stricta (Torr.) Rydb. – not accepted
  Distichlis stricta var. stricta (Torr.) Rydb. – not accepted
  Hoita rhombifolia (Torr.) Rydb. – not accepted
  Odostemon fremontii (Torr.) Rydb. – not accepted
  Oreobatus deliciosus (Torr.) Rydb. – not accepted
  Phymosia longisepala (Torr.) Rydb. – not accepted
  Suckleya suckleyana (Torr.) Rydb. – accepted – poison suckleya
  Suckleyi suckleyana (Torr.) Rydb. – not accepted
  Toxicoscordion fremontii (Torr.) Rydb. – accepted – Fremont's deathcamas
  Yucca gilbertiana (Trel.) Rydb. – not accepted
  Muhlenbergia richardsonis (Trin.) Rydb. – accepted – soft-leaf muhly, muhlenbergie de Richardson, mat muhly
  Muhlenbergia squarrosa (Trin.) Rydb. – not accepted
  Amaranthus pubescens (Uline & W.L. Bray) Rydb. – not accepted
  Porophyllum leiocarpum (Urb.) Rydb. – accepted – yerba de peo
  Galactia mississippiensis (Vail) Rydb. – not accepted
  Deschampsia ciliata (Vasey ex Beal) Rydb. – not accepted
  Deschampsia confinis (Vasey ex Beal) Rydb. – not accepted
  Eatonia robusta (Vasey ex L.H. Dewey) Rydb. – not accepted
  Eatonia obtusata var. robusta Vasey ex Rydb. – not accepted
  Festuca ingrata var. nudata Vasey ex Rydb. – not accepted
  Trisetum majus Vasey ex Rydb. – not accepted
  Eatonia obtusata var. purpurascens Vasey ex Rydb. & Shear – not accepted
  Poa laxa var. occidentalis Vasey ex Rydb. & Shear – not accepted
  Sphenopholis obtusata f. purpurascens (Vasey ex Rydb. & Shear) Waterf. – not accepted
  Trisetum spicatum ssp. majus (Vasey ex Rydb.) Hultén – not accepted
  Calamagrostis canadensis var. acuminata Vasey ex Shear & Rydb. – not accepted
  Calamagrostis langsdorfii var. acuminata (Vasey ex Shear & Rydb.) Litw. – not accepted
  Dodecatheon frenchii (Vasey) Rydb. – not accepted – French's shootingstar
  Muhlenbergia wolfii (Vasey) Rydb. – not accepted
  Poa occidentalis (Vasey) Rydb. – not accepted
  Petalostemon purpureus (Vent.) Rydb. – not accepted
  Boebera papposa (Vent.) Rydb. ex Britton – not accepted
  Galarhoeus lucidus (Waldst. & Kit.) Rydb. – not accepted
  Ambrosia monophylla (Walter) Rydb. – not accepted
  Vulpia octoflora (Walter) Rydb. – accepted – pullout grass, sixweeks grass, sixweeks fescue, eight-flower six-weeks grass
  Vulpia octoflora var. octoflora (Walter) Rydb. – accepted – sixweeks fescue, eight-flower six-weeks grass
  Amarella plebeja var. holmii (Wettst.) Rydb. – not accepted
  Heuchera hirsuticaulis (Wheelock) Rydb. – not accepted
  Heuchera tenuifolia (Wheelock) Rydb. – not accepted
  Bidens puberula (Wiegand) Rydb. – not accepted
  Echinochloa microstachya (Wiegand) Rydb. – not accepted
  Echinochloa occidentalis (Wiegand) Rydb. – not accepted
  Galium subbiflorum (Wiegand) Rydb. – not accepted
  Triosteum illinoense (Wiegand) Rydb. – not accepted
  Dasyochloa Willd. ex Rydb. – accepted – woollygrass
  Dasiphora fruticosa ssp. tenuifolia (Willd. ex Schltdl.) Rydb. – not accepted
  Blephariglotis blephariglottis (Willd.) Rydb. – not accepted
  Blephariglottis blephariglottis (Willd.) Rydb. – not accepted
  Parosela alopecuroides (Willd.) Rydb. – not accepted
  Potentilla sierrae-blancae Wooton & Rydb. – accepted – Sierra Blanca cinquefoil
  Pediomelum megalanthum (Wooton & Standl.) Rydb. – accepted – Intermountain Indian breadroot, large-flowered Indian breadroot
  Pediomelum megalanthum var. megalanthum (Wooton & Standl.) Rydb. – accepted – Intermountain Indian breadroot
  Nuttallia rusbyi (Wooton) Rydb. – not accepted
  Argentina egedii (Wormsk.) Rydb. – not accepted – Pacific silverweed
  Argentina egedii ssp. egedii (Wormsk.) Rydb. – not accepted – Pacific silverweed
  Agropyron leersianum (Wulfen ex Schweigg.) Rydb. – not accepted
  Sphaeralcea marginata York ex Rydb. – not accepted
  Diarrhena arundinacea (Zea ex Lag.) Rydb. – not accepted
   

A gray bar