Integrated Taxonomic Information System - Search Results

Results of: Search in every Kingdom for Taxon Author(s) Name(s) containing 'Engelm.'
 
 Kingdom Plantae
  Isoetes nuttallii A. Braun ex Engelm. – accepted – Nuttall's quillwort
  Isoetes nuttallii var. nuttallii A. Braun ex Engelm. – not accepted – Nuttall's quillwort
  Najas indica var. gracillima A. Braun ex Engelm. – not accepted
  Najas gracillima (A. Braun ex Engelm.) Magnus – accepted – slender waternymph
  Quercus X runcinata (A. DC.) Engelm. – accepted – oak
  Agassizia suavis A. Gray & Engelm. – not accepted
  Brickellia cylindracea A. Gray & Engelm. – accepted – gravelbar brickellbush
  Keerlia bellidifolia A. Gray & Engelm. – not accepted
  Lindheimera A. Gray & Engelm. – accepted – lindheimera
  Lindheimera texana A. Gray & Engelm. – accepted – Texas yellowstar, Texas star
  Vernonia lindheimeri A. Gray & Engelm. – accepted – woolly ironweed
  Gaillardia suavis (A. Gray & Engelm.) Britton & Rusby – accepted – perfumeballs, sweet gaillardia
  Chaetopappa bellidifolia (A. Gray & Engelm.) Shinners – accepted – whiteray leastdaisy
  Linum rupestre (A. Gray) Engelm. ex A. Gray – accepted – rock flax
  Solidago microphylla (A. Gray) Engelm. ex Small – not accepted
  Mammillaria robustispina A. Schott ex Engelm. – not accepted
  Opuntia mamillata A. Schott ex Engelm. – not accepted – Nopal de mamilas
  Cylindropuntia fulgida var. mamillata (A. Schott ex Engelm.) Backeb. – accepted
  Coryphantha robustispina (A. Schott ex Engelm.) Britton & Rose – accepted – Biznaga-partida de espinas gruesas
  Coryphantha robustispina ssp. robustispina (A. Schott ex Engelm.) Britton & Rose – accepted
  Coryphantha muehlenpfordtii ssp. robustispina (A. Schott ex Engelm.) Dicht – not accepted
  Opuntia fulgida var. mamillata (A. Schott ex Engelm.) J.M. Coult. – not accepted – jumping cholla, compact jumping cholla
  Cactus robustispinus (A. Schott ex Engelm.) Kuntze – not accepted
  Coryphantha scheeri var. robustispina (A. Schott ex Engelm.) L.D. Benson – not accepted – longtubercle beehive cactus, Pima pineapple cactus
  Coryphantha muehlenpfordtii var. robustispina (A. Schott ex Engelm.) W.T. Marshall – not accepted
  Opuntia emoryi auct. non Engelm. – not accepted
  Pinus contorta var. murrayana (Balf.) Engelm. – accepted – tamarack pine, Sierra lodgepole pine, Murray's lodgepole pine
  Pinus ponderosa ssp. jeffreyi (Balf.) Engelm. – not accepted
  Brazoria truncata (Benth.) Engelm. & A. Gray – accepted – rattlesnake flower
  Brazoria truncata var. truncata (Benth.) Engelm. & A. Gray – accepted – rattlesnake flower
  Cuscuta arvensis Beyr. ex Engelm. – not accepted
  Euphorbia micromera Boiss. ex Engelm. – accepted – Sonoran sandmat, tiny sandmat, desert spurge
  Chamaesyce micromera (Boiss. ex Engelm.) Wooton & Standl. – not accepted – desert spurge, Sonoran sandmat
  Vitis aestivalis var. monticola (Buckley) Engelm. – not accepted
  Pinus inops var. clausa Chapm. ex Engelm. – not accepted
  Pinus clausa (Chapm. ex Engelm.) Vasey ex Sarg. – accepted – sand pine, scrub pine, spruce pine
  Phoradendron tomentosum (DC.) Engelm. ex A. Gray – not accepted – downy mistletoe, bigleaf mistletoe, Christmas mistletoe
  Phoradendron tomentosum var. tomentosum (DC.) Engelm. ex A. Gray – not accepted
  Isoetes echinospora var. braunii (Durieu) Engelm. – not accepted
  Isoetes echinospora var. muricata (Durieu) Engelm. – not accepted
  Abies subalpina Engelm. – not accepted
  Agave deserti Engelm. – accepted – desert agave, Maguey de Desierto
  Agave deserti ssp. deserti Engelm. – not accepted – desert agave
  Agave deserti var. deserti Engelm. – accepted – desert agave
  Agave palmeri Engelm. – accepted – Palmer's century plant, Maguey de tlalcoyote, Palmer agave, Palmer century plant
  Agave parryi Engelm. – accepted – Parry's agave, Parry agave, Mezcal yapavai
  Agave parryi ssp. parryi Engelm. – accepted – Parry's agave, Huachuca agave, rough agave
  Agave parryi var. parryi Engelm. – not accepted – Parry's agave
  Agave schottii Engelm. – accepted – Schott's century plant, Maguey puercoespín, Schott agave
  Agave schottii var. schottii Engelm. – accepted – Schott's century plant, Schott agave
  Agave shawii Engelm. – accepted – coastal agave, Shaw's agave, Maguey primavera
  Agave shawii var. shawii Engelm. – accepted – coastal agave
  Agave utahensis Engelm. – accepted – Utah agave
  Agave utahensis var. utahensis Engelm. – accepted – Utah agave
  Arceuthobium campylopodum Engelm. – accepted – western dwarf mistletoe
  Arceuthobium cryptopodum Engelm. – not accepted
  Arceuthobium divaricatum Engelm. – accepted – pinyon dwarf mistletoe
  Arceuthobium douglasii Engelm. – accepted – Douglas fir dwarf mistletoe
  Arceuthobium occidentale Engelm. – not accepted – gray pine dwarf mistletoe, digger pine dwarf mistletoe
  Astephanus utahensis Engelm. – not accepted
  Atheropogon papillosus Engelm. – not accepted
  Bouvardia glaberrima Engelm. – not accepted
  Buchloe Engelm. – not accepted – buffalograss
  Callitriche austinii Engelm. – not accepted
  Campanula scabrella Engelm. – accepted – rough bellflower
  Castilleja indivisa Engelm. – accepted – Texas paintbrush, entireleaf Indian paintbrush
  Cereus emoryi Engelm. – not accepted
  Cereus fendleri Engelm. – not accepted
  Cereus giganteus Engelm. – not accepted – saguaro
  Cereus greggii Engelm. – not accepted
  Cereus greggii var. greggii Engelm. – not accepted – desert nightblooming cereus
  Cereus greggii var. transmontanus Engelm. – not accepted
  Cereus paucispinus Engelm. – not accepted
  Cereus pectinatus var. rigidissimus Engelm. – not accepted
  Cereus phoeniceus Engelm. – not accepted
  Cereus schottii Engelm. – not accepted
  Cereus stramineus Engelm. – not accepted
  Cereus thurberi Engelm. – not accepted
  Cereus viridiflorus var. cylindricus Engelm. – not accepted
  Cirsium filipendulum Engelm. – not accepted
  Clematis coccinea Engelm. – not accepted
  Corydalis crystallina Engelm. – accepted – mealy fumewort, mealy corydalis
  Corydalis curvisiliqua Engelm. – accepted – curvepod corydalis, curvepod fumewort
  Corydalis curvisiliqua ssp. curvisiliqua Engelm. – accepted – curvepod fumewort
  Corydalis montana Engelm. – not accepted
  Croton corymbulosus Engelm. – not accepted
  Cuscuta applanata Engelm. – accepted – Gila River dodder
  Cuscuta californica var. apiculata Engelm. – accepted – chaparral dodder
  Cuscuta californica var. breviflora Engelm. – not accepted – California dodder, western dodder, chaparral dodder
  Cuscuta cephalanthi Engelm. – accepted – butterbush dodder, buttonbush dodder
  Cuscuta coryli Engelm. – accepted – hazel dodder
  Cuscuta corylii Engelm. – not accepted
  Cuscuta cuspidata Engelm. – accepted – cusp dodder
  Cuscuta denticulata Engelm. – accepted – small-tooth dodder, desert dodder
  Cuscuta denticulata var. denticulata Engelm. – accepted – desert dodder, smalltooth dodder
  Cuscuta exaltata Engelm. – accepted – tall dodder
  Cuscuta gronovii var. calyptrata Engelm. – accepted – scaldweed
  Cuscuta gronovii var. curta Engelm. – not accepted
  Cuscuta gronovii var. latiflora Engelm. – not accepted
  Cuscuta leptantha Engelm. – accepted – slender dodder
  Cuscuta mitriformis Engelm. – accepted – joint dodder, Cochise dodder
  Cuscuta obtusiflora var. glandulosa Engelm. – accepted – Peruvian dodder
  Cuscuta odontolepis Engelm. – accepted – Santa Rita dodder, Santa Rita Mountain dodder
  Cuscuta pentagona Engelm. – accepted – lespedeza dodder, bush-clover dodder, field dodder, fiveangled dodder
  Cuscuta pentagona var. calycina Engelm. – not accepted
  Cuscuta pentagona var. pentagona Engelm. – not accepted – fiveangled dodder, bush-clover dodder, fiveangle dodder, field dodder
  Cuscuta polygonorum Engelm. – accepted – smartweed dodder
  Cuscuta salina Engelm. – accepted – goldenthread, saltmarsh dodder
  Cuscuta salina var. salina Engelm. – accepted – saltmarsh dodder
  Cuscuta squamata Engelm. – accepted – scaleflower dodder
  Dicentra ochroleuca Engelm. – accepted – yellow bleedingheart, yellow bleeding hearts
  Dithyrea wislizeni Engelm. – not accepted
  Echinocactus bicolor var. schottii Engelm. – not accepted
  Echinocactus brevihamatus Engelm. – not accepted
  Echinocactus intertextus Engelm. – not accepted
  Echinocactus intertextus var. dasyacanthus Engelm. – not accepted
  Echinocactus lecontei Engelm. – not accepted
  Echinocactus parryi Engelm. – accepted
  Echinocactus pubispinus Engelm. – not accepted
  Echinocactus setispinus Engelm. – not accepted
  Echinocactus simpsonii Engelm. – not accepted
  Echinocactus uncinatus var. wrightii Engelm. – not accepted
  Echinocactus unguispinus Engelm. – not accepted
  Echinocactus whipplei var. spinosior Engelm. – not accepted
  Echinocactus wislizeni Engelm. – not accepted
  Echinocereus Engelm. – accepted – hedgehog cactus
  Echinocereus adustus Engelm. – accepted
  Echinocereus adustus ssp. adustus Engelm. – accepted
  Echinocereus coccineus Engelm. – accepted – Órgano-pequeño de espinas escarlatas, scarlet hedgehog cactus
  Echinocereus coccineus ssp. coccineus Engelm. – accepted
  Echinocereus coccineus var. coccineus Engelm. – not accepted – scarlet hedgehog cactus, Bisbee cactus
  Echinocereus dasyacanthus Engelm. – accepted – Órgano-pequeño arcoiris de Texas, spiny hedgehog cactus
  Echinocereus dasyacanthus ssp. dasyacanthus Engelm. – not accepted
  Echinocereus enneacanthus Engelm. – accepted – Órgano-pequeño alicoche real, pitaya, smallspine pitaya
  Echinocereus enneacanthus ssp. enneacanthus Engelm. – accepted
  Echinocereus enneacanthus var. enneacanthus Engelm. – not accepted – pitaya
  Echinocereus polyacanthus Engelm. – accepted – Órgano-pequeño enmarañado, Mojave mound cactus
  Echinocereus polyacanthus ssp. polyacanthus Engelm. – not accepted
  Echinocereus triglochidiatus Engelm. – accepted – Órgano-pequeño copa de vino, kingcup cactus, claretcup hedgehog, Mojave mound cactus
  Echinocereus triglochidiatus ssp. triglochidiatus Engelm. – not accepted
  Echinocereus triglochidiatus var. triglochidiatus Engelm. – not accepted – kingcup cactus
  Echinocereus viridiflorus Engelm. – accepted – nylon hedgehog cactus, green pitaya
  Echinocereus viridiflorus ssp. viridiflorus Engelm. – accepted
  Echinocereus viridiflorus var. viridiflorus Engelm. – not accepted – nylon hedgehog cactus
  Echinodorus parvulus Engelm. – not accepted – mudbabies
  Equisetum affine Engelm. – not accepted
  Eriogonum alpinum Engelm. – accepted – Trinity buckwheat
  Eriogonum atrorubens Engelm. – accepted – red buckwheat, buckwheat
  Eriogonum atrorubens var. atrorubens Engelm. – accepted – red buckwheat
  Eryngium heterophyllum Engelm. – accepted – Wright's eryngo
  Euphorbia acuta Engelm. – accepted – Pointed sandmat
  Euphorbia angusta Engelm. – accepted – Blackfoot sandmat, narrow-leaf spurge
  Euphorbia arizonica Engelm. – accepted – Arizona sandmat
  Euphorbia barbellata Engelm. – not accepted
  Euphorbia bifurcata Engelm. – accepted – forked spurge
  Euphorbia bilobata Engelm. – accepted – blackseed spurge, black-seed spurge
  Euphorbia brachycera Engelm. – accepted – horned spurge, shorthorn spurge
  Euphorbia capitellata Engelm. – accepted – head sandmat, capitate sandmat, head spurge
  Euphorbia cinerascens Engelm. – accepted – ashy sandmat
  Euphorbia cinerascens var. appendiculata Engelm. – not accepted
  Euphorbia colorata Engelm. – accepted
  Euphorbia crenulata Engelm. – accepted – Chinese caps, Chinesecaps
  Euphorbia curtisii Engelm. – accepted – Curtis' spurge, sandhills spurge
  Euphorbia dentata var. cuphosperma Engelm. – not accepted
  Euphorbia dentata var. rigida Engelm. – not accepted
  Euphorbia dictyosperma var. leiococca Engelm. – not accepted
  Euphorbia dictyosperma var. mexicana Engelm. – not accepted
  Euphorbia dioeca var. indivisa Engelm. – not accepted
  Euphorbia esuliformis var. subdentata Engelm. – not accepted
  Euphorbia exstipulata Engelm. – accepted – squareseed spurge, square-seed spurge, Clark Mountain spurge
  Euphorbia exstipulata var. exstipulata Engelm. – not accepted – squareseed spurge, Clark Mountain spurge
  Euphorbia florida Engelm. – accepted – Chiricahua Mountain sandmat
  Euphorbia geyeri Engelm. – accepted – Geyer's sandmat, Geyer's spurge
  Euphorbia geyeri var. geyeri Engelm. – accepted – Geyer's sandmat, Geyer's spurge
  Euphorbia glyptosperma Engelm. – accepted – ridgeseed spurge, ribseed sandmat
  Euphorbia glyptosperma var. tenerrima Engelm. – not accepted
  Euphorbia gymnoclada Engelm. – not accepted
  Euphorbia heterophylla var. graminifolia Engelm. – not accepted
  Euphorbia hypericifolia var. communis Engelm. – not accepted
  Euphorbia incisa Engelm. – not accepted – Mojave spurge
  Euphorbia incisa var. incisa Engelm. – not accepted – Mojave spurge
  Euphorbia lata Engelm. – accepted – hoary sandmat, broadleaf spurge
  Euphorbia lurida Engelm. – accepted – San Francisco Mountain spurge, woodland spurge
  Euphorbia melanadenia var. subinappendiculata Engelm. – not accepted
  Euphorbia montana Engelm. – not accepted
  Euphorbia montana var. gracilior Engelm. – not accepted
  Euphorbia montana var. robusta Engelm. – not accepted
  Euphorbia multicaulis Engelm. – not accepted
  Euphorbia parryi Engelm. – accepted – Parry's sandmat, dune spurge
  Euphorbia pediculifera Engelm. – accepted – Carrizo Mountain sandmat
  Euphorbia pediculifera var. pediculifera Engelm. – accepted
  Euphorbia peplidion Engelm. – accepted – low spurge
  Euphorbia petaloidea Engelm. – not accepted
  Euphorbia petaloidea var. flagelliformis Engelm. – not accepted
  Euphorbia petaloidea var. intermedia Engelm. – not accepted
  Euphorbia petaloidea var. nicolletii Engelm. – not accepted
  Euphorbia petaloidea var. nuttallii Engelm. – not accepted
  Euphorbia pilulifera var. discolor Engelm. – not accepted
  Euphorbia pycnanthema Engelm. – not accepted
  Euphorbia revoluta Engelm. – accepted – threadstem sandmat, threadstem spurge
  Euphorbia schizoloba Engelm. – accepted – Mojave spurge
  Euphorbia serrula Engelm. – accepted – sawtooth sandmat
  Euphorbia stictospora Engelm. – accepted – slimseed sandmat, mat spurge, narrow-seeded spurge
  Euphorbia stictospora var. stictospora Engelm. – accepted
  Euphorbia tetrapora Engelm. – accepted – weak spurge
  Euphorbia trachysperma Engelm. – accepted – San Pedro River sandmat
  Eysenhardtia spinosa Engelm. – accepted – spiny kidneywood
  Fouquieria splendens Engelm. – accepted – ocotillo
  Gaura suffulta Engelm. – not accepted – kisses, roadside gaura
  Gaura suffulta ssp. suffulta Engelm. – not accepted – kisses
  Gentiana barbellata Engelm. – not accepted
  Gentiana heterosepala Engelm. – not accepted
  Gentiana parryi Engelm. – accepted – Parry's gentian
  Gentiana prostrata var. americana Engelm. – not accepted
  Gentiana wislizeni Engelm. – not accepted
  Geranium fremontii var. parryi Engelm. – not accepted
  Gerardia spiciflora Engelm. – not accepted
  Guaiacum angustifolium Engelm. – accepted – Texas lignum-vitae
  Guajacum angustifolium Engelm. – not accepted – Texas lignum-vitae, guayacan
  Hesperaloe Engelm. – accepted – falseyucca, false yucca
  Heuchera sanguinea Engelm. – accepted – coralbells
  Heuchera sanguinea var. sanguinea Engelm. – not accepted – coralbells
  Isoetes bolanderi Engelm. – accepted – Bolander's quillwort
  Isoetes bolanderi var. bolanderi Engelm. – not accepted – Bolander's quillwort
  Isoetes butleri Engelm. – accepted – limestone quillwort, Butler's quillwort
  Isoetes echinospora var. robusta Engelm. – not accepted
  Isoetes engelmannii var. georgiana Engelm. – not accepted – Appalachian quillwort
  Isoetes engelmannii var. gracilis Engelm. – not accepted
  Isoetes engelmannii var. valida Engelm. – not accepted
  Isoetes flaccida var. chapmanii Engelm. – not accepted – Chapman's quillwort
  Isoetes flaccida var. rigida Engelm. – not accepted – southern quillwort
  Isoetes howellii Engelm. – accepted – Howell's quillwort
  Isoetes lacustris var. paupercula Engelm. – not accepted
  Isoetes melanospora Engelm. – accepted – black-spored quillwort, blackspore quillwort
  Isoetes pygmaea Engelm. – not accepted
  Isoetes riparia var. canadensis Engelm. – not accepted
  Isoetes saccharata Engelm. – not accepted – sugar quillwort
  Jatropha macrorhiza var. septemfida Engelm. – not accepted – ragged nettlespurge, ragged jatropha
  Juncus acuminatus var. robustus Engelm. – not accepted
  Juncus acutus var. sphaerocarpus Engelm. – not accepted
  Juncus arcticus var. sitchensis Engelm. – not accepted
  Juncus articulatus var. obtusatus Engelm. – not accepted
  Juncus balticus var. littoralis Engelm. – not accepted – Baltic rush
  Juncus balticus var. montanus Engelm. – not accepted – mountain rush
  Juncus bolanderi Engelm. – accepted – Bolander's rush
  Juncus brachycarpus Engelm. – accepted – whiteroot rush
  Juncus breweri Engelm. – accepted – Brewer's rush
  Juncus chlorocephalus Engelm. – accepted – greenhead rush
  Juncus cooperi Engelm. – accepted – Cooper rush, Cooper's rush
  Juncus dubius Engelm. – accepted – dubius rush, Mariposa rush, questionable rush
  Juncus effusus var. brunneus Engelm. – not accepted – lamp rush, soft rush
  Juncus hallii Engelm. – accepted – Hall's rush, Hall rush
  Juncus kelloggii Engelm. – accepted – Kellogg's rush, Kellogg's dwarf rush
  Juncus oxymeris Engelm. – accepted – pointed rush
  Juncus parryi Engelm. – accepted – Parry rush, Parry's rush
  Juncus pelocarpus var. crassicaudex Engelm. – not accepted
  Juncus phaeocephalus Engelm. – accepted – brownhead rush
  Juncus phaeocephalus var. glomeratus Engelm. – not accepted
  Juncus phaeocephalus var. paniculatus Engelm. – accepted – brownhead rush
  Juncus phaeocephalus var. phaeocephalus Engelm. – accepted – brownhead rush
  Juncus rugulosis Engelm. – not accepted
  Juncus rugulosus Engelm. – not accepted – wrinkled rush
  Juncus supiniformis Engelm. – accepted – hairyleaf rush
  Juncus tenuis var. congestus Engelm. – not accepted
  Juncus triformis Engelm. – accepted – Yosemite dwarf rush
  Juncus vaseyi Engelm. – accepted – Vasey rush, Vasey's rush
  Juncus xiphioides var. macranthus Engelm. – not accepted
  Juncus xiphioides var. montanus Engelm. – not accepted
  Juncus xiphioides var. triandrus Engelm. – not accepted
  Juniperus californica var. utahensis Engelm. – not accepted
  Juniperus occidentalis var. conjungens Engelm. – not accepted
  Larrea glutinosa Engelm. – not accepted
  Lespedeza leptostachya Engelm. – accepted – prairie lespedeza, prairie bush-clover
  Linum aristatum Engelm. – accepted – bristle flax
  Linum greggii Engelm. – not accepted
  Linum rigidum var. puberulum Engelm. – not accepted
  Mammillaria aggregata Engelm. – not accepted
  Mammillaria applanata Engelm. – not accepted
  Mammillaria arizonica Engelm. – not accepted
  Mammillaria barbata Engelm. – accepted
  Mammillaria compacta Engelm. – not accepted
  Mammillaria dasyacantha Engelm. – not accepted
  Mammillaria deserti Engelm. – not accepted
  Mammillaria echinus Engelm. – not accepted
  Mammillaria fasciculata Engelm. – not accepted
  Mammillaria fissurata Engelm. – not accepted
  Mammillaria grahamii Engelm. – accepted – Graham's pincushion cactus, Graham's nipple cactus
  Mammillaria grahamii ssp. grahamii Engelm. – accepted
  Mammillaria grahamii var. grahamii Engelm. – not accepted – fishhook pincushion, Graham's nipple cactus
  Mammillaria gummifera Engelm. – not accepted – Biznaga lechosa
  Mammillaria hemisphaerica Engelm. – not accepted
  Mammillaria lasiacantha Engelm. – accepted – small pincushion cactus, Biznaga de espinas pubescentes, lacespine nipple cactus
  Mammillaria lasiacantha ssp. lasiacantha Engelm. – not accepted
  Mammillaria lasiacantha var. denudata Engelm. – not accepted
  Mammillaria macromeris Engelm. – not accepted
  Mammillaria meiacantha Engelm. – accepted – Biznaga de pocas espinas
  Mammillaria microcarpa Engelm. – not accepted
  Mammillaria micromeris Engelm. – not accepted
  Mammillaria micromeris var. greggii Engelm. – not accepted
  Mammillaria papyracantha Engelm. – not accepted
  Mammillaria recurvata Engelm. – not accepted
  Mammillaria similis Engelm. – not accepted
  Mammillaria similis var. robustior Engelm. – not accepted
  Mammillaria sulcata Engelm. – not accepted
  Mammillaria tetrancistra Engelm. – accepted – corkseed pincushion cactus, Biznaga de cuatro ganchos, common fishhook cactus
  Mammillaria tuberculosa Engelm. – not accepted
  Mammillaria vivipara var. borealis Engelm. – not accepted
  Mammillaria vivipara var. radiosa Engelm. – not accepted
  Mammillaria wrightii Engelm. – accepted – Wright's pincushion cactus, Biznaga de Wright, Wright's nipple cactus
  Mammillaria wrightii ssp. wrightii Engelm. – accepted
  Mammillaria wrightii var. wrightii Engelm. – not accepted – Wright's nipple cactus
  Martynia arenaria Engelm. – not accepted
  Monanthochloe Engelm. – not accepted – shoregrass, monanthochloe
  Monanthochloe littoralis Engelm. – not accepted – shoregrass
  Myosotis macrosperma Engelm. – accepted – southern forget-me-not, largeseed forget-me-not
  Nuphar polysepala Engelm. – accepted – Rocky Mountain pond-lily
  Opuntia arborescens Engelm. – not accepted
  Opuntia arbuscula Engelm. – not accepted – Cholla arbusto, Arizona pencil cholla, pencil cholla
  Opuntia arenaria Engelm. – not accepted – El Paso pricklypear, sand pricklypear, sand prickly-pear
  Opuntia bigelovii Engelm. – not accepted – Cholla velas de Coyote, teddybear cholla
  Opuntia bigelovii var. bigelovii Engelm. – not accepted – teddybear cholla
  Opuntia bulbispina Engelm. – not accepted
  Opuntia californica Engelm. – not accepted
  Opuntia clavata Engelm. – not accepted – club cholla
  Opuntia dulcis Engelm. – not accepted
  Opuntia emoryi Engelm. – not accepted
  Opuntia engelmannii var. littoralis Engelm. – not accepted
  Opuntia fulgida Engelm. – not accepted – jumping cholla, Cholla brillante
  Opuntia fulgida var. fulgida Engelm. – not accepted – jumping cholla
  Opuntia grahami Engelm. – not accepted
  Opuntia grahamii Engelm. – not accepted – Cholla de Graham, Graham's pricklypear, devil cholla
  Opuntia grandiflora Engelm. – not accepted
  Opuntia lindheimeri Engelm. – not accepted – Nopal arrastrado
  Opuntia macrocentra Engelm. – accepted – Nopal violaceo, purple pricklypear
  Opuntia macrocentra var. macrocentra Engelm. – accepted – purple pricklypear, redjoint pricklypear, longspine pricklypear
  Opuntia macrorhiza Engelm. – accepted – Nopal raizudo, twistspine pricklypear, grassland pricklypear, plains twistspine pricklypear
  Opuntia macrorhiza var. macrorhiza Engelm. – not accepted – twistspine pricklypear, bigflower pricklypear
  Opuntia microcarpa Engelm. – not accepted – smallfruit cactus
  Opuntia parryi Engelm. – not accepted – Cholla de California, brownspined pricklypear
  Opuntia parryi var. parryi Engelm. – not accepted – brownspined pricklypear
  Opuntia phaeacantha Engelm. – accepted – Nopal pardo, tulip pricklypear, brownspine pricklypear
  Opuntia phaeacantha var. major Engelm. – accepted – Mojave pricklypear, great pricklypear
  Opuntia phaeacantha var. phaeacantha Engelm. – accepted – tulip pricklypear
  Opuntia prolifera Engelm. – not accepted – Cholla prolifera, coastal cholla
  Opuntia pulchella Engelm. – not accepted – sagebrush cholla, sand club cholla, sand cholla
  Opuntia rafinesquei Engelm. – not accepted
  Opuntia ramosissima Engelm. – not accepted – Cholla diamante, branched pencil cholla, diamond cholla, pencil cholla
  Opuntia rufida Engelm. – accepted – Nopal rojizo, blind pricklypear
  Opuntia schottii Engelm. – not accepted – Cholla abrojo de Texas, dog cholla, dog cactus
  Opuntia serpentina Engelm. – not accepted – Cholla serpentina
  Opuntia sphaerocarpa var. utahensis Engelm. – not accepted
  Opuntia standlyi Engelm. – not accepted
  Opuntia stanlyi Engelm. – not accepted
  Opuntia stenopetala Engelm. – accepted
  Opuntia strigil Engelm. – accepted – marblefruit pricklypear
  Opuntia subulata Engelm. – not accepted
  Opuntia tenuispina Engelm. – not accepted
  Opuntia thurberi Engelm. – not accepted
  Opuntia vaginata Engelm. – not accepted
  Opuntia violacea Engelm. – not accepted
  Opuntia whipplei var. spinosior Engelm. – not accepted
  Passiflora affinis Engelm. – accepted – bracted passionflower
  Passiflora tenuiloba Engelm. – accepted – birdwing passionflower
  Phoradendron flavescens var. macrophyllum Engelm. – not accepted
  Phoradendron juniperinum var. libocedri Engelm. – not accepted
  Picea pungens Engelm. – accepted – silver spruce, Colorado blue spruce, blue spruce
  Pinus albicaulis Engelm. – accepted – scrub pine, white pine, whitebark pine
  Pinus aristata Engelm. – accepted – bristlecone pine, foxtail pine, hickory pine
  Pinus arizonica Engelm. – accepted – pino de Arizona, Arizona pine
  Pinus arizonica var. arizonica Engelm. – accepted – Arizona pine
  Pinus brachyptera Engelm. – not accepted
  Pinus chihuahuana Engelm. – not accepted – pino de Chihuahua
  Pinus edulis Engelm. – accepted – twoneedle pinyon, nut pine, Colorado pinyon, pinyon, two-leaf pinyon, two-needle pinyon, piñón de Colorado, piñon pine, pinyon pine
  Pinus edulis var. edulis Engelm. – not accepted – twoneedle pinyon
  Pinus elliottii Engelm. – accepted – slash pine
  Pinus elliottii var. elliottii Engelm. – accepted – Honduras pine
  Pinus flexilis var. reflexa Engelm. – not accepted
  Pinus ponderosa var. scopulorum Engelm. – accepted – interior pondersosa pine, Black Hills ponderosa pine, ponderosa pine, Rocky Mountain ponderosa pine
  Pinus strobiformis Engelm. – accepted – southwestern white pine, border limber pine, border white pine, Mexican white pine
  Plantago pusilla var. major Engelm. – not accepted
  Polygonum tenue var. microspermum Engelm. – not accepted
  Portulaca lanceolata Engelm. – not accepted
  Portulaca retusa Engelm. – not accepted
  Portulaca suffrutescens Engelm. – accepted – shrubby purslane
  Quercus agrifolia var. frutescens Engelm. – not accepted – coastal live oak
  Quercus breweri Engelm. – not accepted
  Quercus falcata var. subintegra Engelm. – not accepted
  Quercus muehlenbergii Engelm. – accepted – chinkapin oak
  Quercus muhlenbergii Engelm. – not accepted – chinkapin oak
  Quercus palmeri Engelm. – accepted – Palmer's oak
  Quercus tomentella Engelm. – accepted – island oak, island live oak
  Quercus wislizeni var. frutescens Engelm. – not accepted – interior live oak
  Quercus wislizenii var. frutescens Engelm. – not accepted
  Ranunculus lindheimeri Engelm. – not accepted
  Ranunculus pusillus var. trachyspermus Engelm. – not accepted
  Rosa minutifolia Engelm. – accepted – Baja rose, small-leaved rose
  Sagittaria calycina Engelm. – not accepted – hooded arrowhead
  Sagittaria calycina var. calycina Engelm. – not accepted – hooded arrowhead
  Sagittaria calycina var. spongiosa Engelm. – not accepted – spongy arrow-head, sagittaire à grand calice variété spongieuse, hooded arrowhead
  Sagittaria cristata Engelm. – accepted – crested arrowhead
  Sagittaria graminea var. platyphylla Engelm. – not accepted
  Sagittaria spongiosus (Engelm.) – not accepted
  Sagittaria variabilis var. obtusa Engelm. – not accepted
  Sida heterocarpa Engelm. – not accepted
  Sparganium eurycarpum Engelm. – accepted – broad-fruit burr-reed, broadfruit burreed, giant burreed, broadfruit bur-reed
  Stellaria obtusa Engelm. – accepted – Rocky Mountain chickweed
  Styrax platanifolia Engelm. – not accepted – sycamoreleaf snowbell
  Talinum aurantiacum Engelm. – not accepted – orange fameflower
  Talinum aurantiacum var. angustissimum Engelm. – not accepted
  Talinum calycinum Engelm. – not accepted – rockpink, largeflower fameflower
  Tsuga caroliniana Engelm. – accepted – Carolina hemlock
  Verbena X paniculatistricta Engelm. – not accepted
  Vitis aestivalis var. canescens Engelm. – not accepted
  Vitis aestivalis var. cinerea Engelm. – not accepted
  Vitis arizonica Engelm. – accepted – canyon grape
  Vitis cordifolia var. foetida Engelm. – not accepted
  Wislizenia Engelm. – accepted
  Wislizenia refracta Engelm. – accepted – jackass clover, spectacle fruit
  Wislizenia refracta ssp. refracta Engelm. – not accepted – spectacle fruit
  Yucca angustissima var. elata Engelm. – not accepted
  Yucca angustissima var. mollis Engelm. – not accepted
  Yucca brevifolia Engelm. – accepted – Izote de desierto, Joshua tree
  Yucca brevifolia var. brevifolia Engelm. – accepted – Joshua tree, western Joshua tree
  Yucca crassifila Engelm. – not accepted
  Yucca crassifolia Engelm. – not accepted
  Yucca elata Engelm. – accepted – Izote forrajero, soaptree yucca
  Yucca elata var. elata Engelm. – accepted – soaptree yucca
  Yucca schottii Engelm. – not accepted – Izote de Schott, Schott's yucca
  Aristolochia longiflora Engelm. & A. Gray – not accepted
  Brazoria Engelm. & A. Gray – accepted – brazosmint, brazos-mint
  Brazoria scutellarioides Engelm. & A. Gray – not accepted – prairie brazosmint
  Daucosma laciniata Engelm. & A. Gray – accepted – meadow parasol
  Dipteracanthus micranthus Engelm. & A. Gray – not accepted
  Dipteracanthus nudiflorus Engelm. & A. Gray – not accepted
  Eriogonum longifolium var. plantagineum Engelm. & A. Gray – not accepted
  Euphorbia arenaria Engelm. & A. Gray – not accepted
  Euphorbia arkansana Engelm. & A. Gray – not accepted
  Euphorbia bicolor Engelm. & A. Gray – accepted – snow on the prairie, snow-on-the-prairie
  Euphorbia bicolor var. concolor Engelm. & A. Gray – not accepted
  Euphorbia marginata var. uloleuca Engelm. & A. Gray – not accepted
  Eustylis Engelm. & A. Gray – not accepted
  Fendlera Engelm. & A. Gray – accepted – fendlerbush
  Fendlera rupicola Engelm. & A. Gray – accepted – fendlerbush, cliff fendlerbush
  Gaura lindheimeri Engelm. & A. Gray – not accepted – white gaura, Lindheimer's beeblossom
  Gonolobus cynanchoides Engelm. & A. Gray – not accepted
  Helianthus praecox Engelm. & A. Gray – accepted – Texas sunflower
  Helianthus praecox ssp. praecox Engelm. & A. Gray – accepted – Texas sunflower
  Hypericum gymnanthum Engelm. & A. Gray – accepted – claspingleaf St. Johnswort
  Liatris acidota Engelm. & A. Gray – accepted – sharp blazing star, sharp gayfeather
  Ludwigia linearis var. puberula Engelm. & A. Gray – not accepted
  Polygonum cristatum Engelm. & A. Gray – not accepted
  Prunus gracilis Engelm. & A. Gray – accepted – Oklahoma plum
  Ranunculus texensis Engelm. & A. Gray – not accepted
  Scutellaria cardiophylla Engelm. & A. Gray – accepted – gulf skullcap
  Sida lindheimeri Engelm. & A. Gray – accepted – showy fanpetals, Lindheimer's sida
  Silene antirrhina var. laevigata Engelm. & A. Gray – not accepted
  Silene antirrhina var. subglaber Engelm. & A. Gray – not accepted
  Sisyrinchium minus Engelm. & A. Gray – accepted – dwarf blueeyed grass, dwarf blue-eyed grass
  Spartina junciformis Engelm. & A. Gray – not accepted
  Spiranthes vernalis Engelm. & A. Gray – accepted – spring lady's tresses, upland ladiestresses, spring ladies'-tresses
  Tragia brevispica Engelm. & A. Gray – accepted – shortspike noseburn
  Phacelia patuliflora (Engelm. & A. Gray) A. Gray – accepted – sand scorpionweed, sand phacelia
  Phacelia patuliflora var. patuliflora (Engelm. & A. Gray) A. Gray – accepted – sand phacelia, sand scorpionweed
  Phacelia strictiflora (Engelm. & A. Gray) A. Gray – accepted – prairie phacelia
  Phacelia strictiflora var. strictiflora (Engelm. & A. Gray) A. Gray – accepted – prairie phacelia, prairie scorpionweed
  Simsia calva (Engelm. & A. Gray) A. Gray – accepted – awnless bushsunflower
  Croton lindheimeri (Engelm. & A. Gray) Alph. Wood – accepted – Lindheimer's hogwort
  Camassia angusta (Engelm. & A. Gray) Blank. – accepted – prairie camas
  Hypoxis hirsuta var. leptocarpa (Engelm. & A. Gray) Brackett – not accepted
  Ruellia strepens var. micrantha (Engelm. & A. Gray) Britton – not accepted
  Neobesseya similis (Engelm. & A. Gray) Britton & Rose – not accepted
  Bilderdykia scandens var. cristata (Engelm. & A. Gray) C.F. Reed – not accepted
  Daucosma Engelm. & A. Gray ex A. Gray – accepted
  Monarda lindheimeri Engelm. & A. Gray ex A. Gray – accepted – Lindheimer's beebalm
  Tetragonotheca texana Engelm. & A. Gray ex A. Gray – accepted – squarebud daisy
  Tetragonothela texana Engelm. & A. Gray ex A. Gray – not accepted
  Polygonum scandens var. cristatum (Engelm. & A. Gray) Gleason – not accepted – false buckwheat, climbing false buckwheat
  Bilderdykia cristata (Engelm. & A. Gray) Greene – not accepted
  Helianthus debilis ssp. praecox (Engelm. & A. Gray) Heiser – not accepted
  Ibidium vernale (Engelm. & A. Gray) House – not accepted
  Dichrophyllum bicolor (Engelm. & A. Gray) Klotzsch & Garcke – not accepted
  Tithymalus arkansanus (Engelm. & A. Gray) Klotzsch & Garcke – not accepted
  Lacinaria acidota (Engelm. & A. Gray) Kuntze – not accepted
  Warnockia scutellarioides (Engelm. & A. Gray) M.W. Turner – accepted – prairie brazosmint
  Limnosciadium pumilum (Engelm. & A. Gray) Mathias & Constance – accepted – prairie dogshade
  Argythammia humilis (Engelm. & A. Gray) Müll. Arg. – not accepted
  Argythamnia humilis (Engelm. & A. Gray) Müll. Arg. – not accepted – low wildmercury, low silverbush
  Argythamnia humilis var. humilis (Engelm. & A. Gray) Müll. Arg. – not accepted – low wildmercury, low silverbush
  Croton capitatus var. lindheimeri (Engelm. & A. Gray) Müll. Arg. – not accepted – Lindheimer's hogwort
  Lepadena bicolor (Engelm. & A. Gray) Nieuwl. – not accepted
  Paysonia auriculata (Engelm. & A. Gray) O'Kane & Al-Shehbaz – accepted – earleaf bladderpod
  Ditaxis humilis (Engelm. & A. Gray) Pax – accepted – low silverbush
  Lesquerella auriculata (Engelm. & A. Gray) S. Watson – not accepted – earleaf bladderpod
  Reynoutria scandens var. cristata (Engelm. & A. Gray) Shinners – not accepted
  Hypoxis leptocarpa (Engelm. & A. Gray) Small – not accepted
  Tiniaria cristata (Engelm. & A. Gray) Small – not accepted
  Galarhoeus arkansanus (Engelm. & A. Gray) Small ex Rydb. – not accepted
  Spartina densiflora var. junciformis (Engelm. & A. Gray) St.-Yves – not accepted
  Ruellia nudiflora (Engelm. & A. Gray) Urb. – accepted – wild petunia, violet wild petunia
  Ruellia nudiflora var. nudiflora (Engelm. & A. Gray) Urb. – accepted – violet wild petunia
  Oenothera lindheimeri (Engelm. & A. Gray) W.L. Wagner & Hoch – accepted – Lindheimer's beeblossom
  Matelea cynanchoides (Engelm. & A. Gray) Woodson – accepted – prairie milkvine
  Echinocactus polyancistrus Engelm. & J.M. Bigelow – not accepted
  Echinocactus polycephalus Engelm. & J.M. Bigelow – accepted – Biznaga-tonel amacollada, cottontop cactus, cottontop barrel cactus
  Echinocactus polycephalus ssp. polycephalus Engelm. & J.M. Bigelow – accepted
  Echinocactus polycephalus var. polycephalus Engelm. & J.M. Bigelow – not accepted – cottontop cactus
  Echinocactus whipplei Engelm. & J.M. Bigelow – not accepted
  Opuntia acanthocarpa Engelm. & J.M. Bigelow – not accepted – Cholla espinosa, buckhorn cholla
  Opuntia acanthocarpa ssp. acanthocarpa Engelm. & J.M. Bigelow – not accepted
  Opuntia acanthocarpa var. acanthocarpa Engelm. & J.M. Bigelow – not accepted – buckhorn cholla
  Opuntia basilaris Engelm. & J.M. Bigelow – accepted – Nopal del castor, beavertail pricklypear
  Opuntia basilaris var. basilaris Engelm. & J.M. Bigelow – accepted – beavertail pricklypear
  Opuntia brachyarthra Engelm. & J.M. Bigelow – not accepted
  Opuntia camanchica Engelm. & J.M. Bigelow – not accepted
  Opuntia chlorotica Engelm. & J.M. Bigelow – accepted – Nopal verdoso, dollarjoint pricklypear, pancake pricklypear
  Opuntia chlorotica var. chlorotica Engelm. & J.M. Bigelow – not accepted
  Opuntia cymochila Engelm. & J.M. Bigelow – not accepted – grassland pricklypear
  Opuntia davisii Engelm. & J.M. Bigelow – not accepted
  Opuntia echinocarpa Engelm. & J.M. Bigelow – not accepted – Cholla plateada, silver cholla, golden cholla
  Opuntia echinocarpa var. echinocarpa Engelm. & J.M. Bigelow – not accepted – staghorn cholla
  Opuntia echinocarpa var. major Engelm. & J.M. Bigelow – not accepted
  Opuntia engelmannii var. cycloides Engelm. & J.M. Bigelow – not accepted
  Opuntia erinacea Engelm. & J.M. Bigelow – not accepted – grizzlybear pricklypear, Mohave pricklypear
  Opuntia erinacea var. erinacea Engelm. & J.M. Bigelow – not accepted – grizzlybear pricklypear
  Opuntia hystricina Engelm. & J.M. Bigelow – not accepted – Nopal puerco espín
  Opuntia missouriensis var. trichophora Engelm. & J.M. Bigelow – not accepted
  Opuntia mojavensis Engelm. & J.M. Bigelow – not accepted
  Opuntia occidentalis Engelm. & J.M. Bigelow – not accepted
  Opuntia sphaerocarpa Engelm. & J.M. Bigelow – not accepted
  Opuntia tortispina Engelm. & J.M. Bigelow – accepted
  Opuntia whipplei Engelm. & J.M. Bigelow – not accepted – Whipple's cholla
  Opuntia whipplei var. whipplei Engelm. & J.M. Bigelow – not accepted – Whipple cholla
  Pediocactus polyancistrus (Engelm. & J.M. Bigelow) Arp – not accepted
  Pediocactus whipplei (Engelm. & J.M. Bigelow) Arp – not accepted
  Opuntia polyacantha var. erinacea (Engelm. & J.M. Bigelow) B.D. Parfitt – accepted
  Opuntia polyacantha var. hystricina (Engelm. & J.M. Bigelow) B.D. Parfitt – accepted
  Echinocereus triglochidiatus var. gonacanthus (Engelm. & J.M. Bigelow) Boissev. – not accepted
  Opuntia trichophora (Engelm. & J.M. Bigelow) Britton & Rose – not accepted – Nopal peludito
  Sclerocactus polyancistrus (Engelm. & J.M. Bigelow) Britton & Rose – accepted – redspined fishhook cactus, Mojave fishhook cactus, Mohave fishhook cactus
  Sclerocactus whipplei (Engelm. & J.M. Bigelow) Britton & Rose – accepted – Whipple's fishhook cactus
  Sclerocactus whipplei ssp. whipplei (Engelm. & J.M. Bigelow) Britton & Rose – not accepted
  Sclerocactus whipplei var. whipplei (Engelm. & J.M. Bigelow) Britton & Rose – not accepted – Whipple's fishhook cactus
  Opuntia compressa var. stenochila (Engelm. & J.M. Bigelow) D. Weniger – not accepted
  Emorycactus polycephalus (Engelm. & J.M. Bigelow) Doweld – not accepted
  Opuntia polyacantha var. rufispina (Engelm. & J.M. Bigelow ex Engelm.) L.D. Benson – accepted – hairspine pricklypear, plains pricklypear, red-spine pricklypear
  Cylindropuntia acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth – accepted
  Cylindropuntia acanthocarpa ssp. acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth – accepted
  Cylindropuntia davisii (Engelm. & J.M. Bigelow) F.M. Knuth – accepted
  Cylindropuntia echinocarpa (Engelm. & J.M. Bigelow) F.M. Knuth – accepted
  Cylindropuntia whipplei (Engelm. & J.M. Bigelow) F.M. Knuth – accepted
  Opuntia phaeacantha var. mojavensis (Engelm. & J.M. Bigelow) Fosberg – not accepted
  Opuntia fragilis var. brachyarthra (Engelm. & J.M. Bigelow) J.M. Coult. – not accepted – brittle pricklypear, Brach pricklypear cactus
  Opuntia polyacantha var. trichophora (Engelm. & J.M. Bigelow) J.M. Coult. – not accepted – hairspine pricklypear, threadspine pricklypear
  Echinocereus triglochidiatus var. mojavensis (Engelm. & J.M. Bigelow) L.D. Benson – not accepted – Mojave kingcup cactus, Mohave hedgehog cactus
  Opuntia acanthocarpa var. major (Engelm. & J.M. Bigelow) L.D. Benson – not accepted – buckhorn cholla, slender joint buckhorn cholla
  Opuntia erinacea var. hystricina (Engelm. & J.M. Bigelow) L.D. Benson – not accepted – grizzlybear pricklypear, porcupine pricklypear
  Opuntia phaeacantha var. camanchica (Engelm. & J.M. Bigelow) L.D. Benson – accepted – tulip pricklypear, brownspine pricklypear
  Opuntia tunicata var. davisii (Engelm. & J.M. Bigelow) L.D. Benson – not accepted – thistle cholla, Jeff Davis cholla
  Echinocereus coccineus ssp. mojavensis (Engelm. & J.M. Bigelow) N.P. Taylor – not accepted
  Ferocactus polyancistrus (Engelm. & J.M. Bigelow) N.P. Taylor – not accepted
  Ferocactus whipplei (Engelm. & J.M. Bigelow) N.P. Taylor – not accepted
  Opuntia X occidentalis Engelm. & J.M. Bigelow (pro sp.) – accepted – pricklypear
  Echinocereus engelmannii var. chrysocentrus (Engelm. & J.M. Bigelow) Rümpler – accepted – Engelmann's hedgehog cactus, yellow-center hedgehog cactus, Saint's hedgehog cactus
  Echinocereus engelmannii var. variegatus (Engelm. & J.M. Bigelow) Rümpler – accepted – Engelmann's hedgehog cactus, varigated hedgehog cactus
  Echinocereus hexaedrus (Engelm. & J.M. Bigelow) Rümpler – not accepted
  Echinocereus mojavensis (Engelm. & J.M. Bigelow) Rümpler – not accepted
  Cylindropuntia acanthocarpa ssp. major (Engelm. & J.M. Bigelow) U. Guzmán – accepted
  Echinocereus triglochidiatus ssp. mojavensis (Engelm. & J.M. Bigelow) W. Blum & Mich. Lange – not accepted
  Opuntia fragilis ssp. brachyarthra (Engelm. & J.M. Bigelow) W.A. Weber – not accepted
  Agave glomeruliflora (Engelm.) A. Berger – not accepted – Chisos Mountain century plant, Chisos agave, Maguey del Bravo
  Agave X glomeruliflora (Engelm.) A. Berger – accepted – Chisos Mountain century plant
  Coryphantha tuberculosa (Engelm.) A. Berger – not accepted
  Roseocactus fissuratus (Engelm.) A. Berger – not accepted
  Cirsium altissimum var. filipendulum (Engelm.) A. Gray – not accepted
  Porlieria angustifolia (Engelm.) A. Gray – not accepted
  Ranunculus pusillus var. lindheimeri (Engelm.) A. Gray – not accepted
  Geranium parryi (Engelm.) A. Heller – not accepted
  Linum puberulum (Engelm.) A. Heller – accepted – desert flax, plains flax
  Tithymalus crenulatus (Engelm.) A. Heller – not accepted
  Mammillaria neomexicana (Engelm.) A. Nelson – not accepted
  Epithelantha micromeris (Engelm.) A. Weber ex Britton & Rose – accepted – Biznaga-blanca chilona, pingpong ball cactus
  Epithelantha micromeris ssp. micromeris (Engelm.) A. Weber ex Britton & Rose – not accepted
  Epithelantha micromeris var. micromeris (Engelm.) A. Weber ex Britton & Rose – not accepted – pingpong ball cactus
  Equisetum hyemale var. affine (Engelm.) A.A. Eaton – not accepted – scouringrush horsetail, stout scouringrush, tall scouring-rush
  Isoetes canadensis (Engelm.) A.A. Eaton – not accepted
  Isoetes paupercula (Engelm.) A.A. Eaton – not accepted
  Stenocereus gummosus (Engelm.) A.C. Gibson & K.E. Horak – accepted
  Opuntia imbricata var. arborescens (Engelm.) A.D. Zimmerman – not accepted
  Pinus ponderosa ssp. arizonica (Engelm.) A.E. Murray – not accepted
  Pinus ponderosa ssp. scopulorum (Engelm.) A.E. Murray – not accepted – Black Hills pondersosa pine, Rocky Mountain ponderosa pine
  Chamaesyce arizonica (Engelm.) Arthur – not accepted – Arizona sandmat
  Abies balsamea var. fallax (Engelm.) B. Boivin – not accepted
  Juncus arcticus var. littoralis (Engelm.) B. Boivin – not accepted
  Juncus greenei var. vaseyi (Engelm.) B. Boivin – not accepted
  Sagittaria montevidensis var. spongiosa (Engelm.) B. Boivin – not accepted
  Opuntia polyacantha var. arenaria (Engelm.) B.D. Parfitt – accepted
  Opuntia engelmannii var. lindheimeri (Engelm.) B.D. Parfitt & Pinkava – accepted – Texas pricklypear
  Centaurium nudicaule (Engelm.) B.L. Rob. – not accepted – Santa Catalina centaurium, Santa Catalina Mountain centaury
  Coryphantha vivipara var. neomexicana (Engelm.) Backeb. – not accepted
  Coryphantha vivipara var. radiosa (Engelm.) Backeb. – not accepted
  Echinomastus intertextus var. dasyacanthus (Engelm.) Backeb. – not accepted
  Glandulicactus uncinatus var. wrightii (Engelm.) Backeb. – not accepted
  Lepidocoryphantha macromeris (Engelm.) Backeb. – not accepted
  Marshallocereus thurberi (Engelm.) Backeb. – not accepted
  Peniocereus greggii var. transmontanus (Engelm.) Backeb. – accepted – nightblooming cereus
  Hesperoyucca (Engelm.) Baker – accepted
  Sagittaria graminea var. cristata (Engelm.) Bogin – not accepted
  Sagittaria montevidensis ssp. calycina (Engelm.) Bogin – accepted – hooded arrowhead
  Sagittaria montevidensis ssp. spongiosa (Engelm.) Bogin – accepted – hooded arrowhead, tidal arrowhead
  Euphorbia adenoptera var. indivisa (Engelm.) Boiss. – not accepted
  Euphorbia cuphosperma (Engelm.) Boiss. – accepted – hairy-fruit spurge, Hairy-fruited Spurge
  Euphorbia leptocera var. crenulata (Engelm.) Boiss. – not accepted
  Euphorbia zygophylloides var. flagelliformis (Engelm.) Boiss. – not accepted
  Sclerocactus whipplei var. spinosior (Engelm.) Boissev. – not accepted
  Echinocereus triglochidiatus var. hexaedrus (Engelm.) Boissev. & C. Davidson – not accepted
  Mammillaria prolifera var. texana (Engelm.) Borg – not accepted – Texas nipple cactus
  Pachycereus thurberi (Engelm.) Bravo – not accepted
  Capnoides montanum (Engelm.) Britton – not accepted
  Ancistrocactus brevihamatus (Engelm.) Britton & Rose – not accepted
  Bergerocactus emoryi (Engelm.) Britton & Rose – accepted – golden snakecactus, Órgano aterciopelado
  Bergerocereus emoryi (Engelm.) Britton & Rose – not accepted
  Carnegia gigantea (Engelm.) Britton & Rose – not accepted
  Carnegiea gigantea (Engelm.) Britton & Rose – accepted – Saguaro, saguaro
  Coryphantha aggregata (Engelm.) Britton & Rose – not accepted
  Coryphantha chlorantha (Engelm.) Britton & Rose – not accepted
  Coryphantha compacta (Engelm.) Britton & Rose – accepted
  Coryphantha deserti (Engelm.) Britton & Rose – not accepted
  Coryphantha echinus (Engelm.) Britton & Rose – not accepted – Biznaga-partida erizo, rhinoceros cactus
  Coryphantha neomexicana (Engelm.) Britton & Rose – not accepted
  Coryphantha pectinata (Engelm.) Britton & Rose – not accepted
  Coryphantha recurvata (Engelm.) Britton & Rose – accepted – Biznaga-partida de espinas curvas, Santa Cruz beehive cactus
  Coryphantha similis (Engelm.) Britton & Rose – not accepted
  Coryphantha sulcata (Engelm.) Britton & Rose – accepted – pineapple cactus, finger cactus
  Coryphantha sulcata var. sulcata (Engelm.) Britton & Rose – not accepted – pineapple cactus
  Echinomastus intertextus (Engelm.) Britton & Rose – not accepted
  Echinomastus intertextus var. intertextus (Engelm.) Britton & Rose – not accepted
  Echinomastus unguispinus (Engelm.) Britton & Rose – not accepted
  Escobaria dasyacantha (Engelm.) Britton & Rose – accepted – Biznaga-Escobar de espinas gruesas, Big Bend foxtail cactus
  Escobaria dasyacantha ssp. dasyacantha (Engelm.) Britton & Rose – accepted
  Escobaria dasyacantha var. dasyacantha (Engelm.) Britton & Rose – not accepted – Big Bend foxtail cactus
  Escobaria tuberculosa (Engelm.) Britton & Rose – accepted – Biznaga-Escobar rómbica, white column foxtail cactus
  Ferocactus lecontei (Engelm.) Britton & Rose – not accepted – Biznaga-barril de Gila
  Ferocactus wislizeni (Engelm.) Britton & Rose – accepted – Biznaga-barril de Nuevo México, candy barrel cactus, fishhook barrel cactus
  Ferocactus wislizenii (Engelm.) Britton & Rose – not accepted
  Lemaireocereus thurberi (Engelm.) Britton & Rose – not accepted
  Lophocereus (Engelm.) Britton & Rose – not accepted
  Lophocereus schottii (Engelm.) Britton & Rose – not accepted – Senita
  Machaerocereus gummosus (Engelm.) Britton & Rose – not accepted
  Pediocactus simpsonii (Engelm.) Britton & Rose – accepted – snowball pediocactus, Simpson's hedgehog cactus
  Pediocactus simpsonii ssp. simpsonii (Engelm.) Britton & Rose – not accepted
  Pediocactus simpsonii var. simpsonii (Engelm.) Britton & Rose – not accepted – Simpson hedgehog cactus, Simpson's hedgehog cactus
  Peniocereus greggii (Engelm.) Britton & Rose – accepted – nightblooming cereus
  Peniocereus greggii var. greggii (Engelm.) Britton & Rose – accepted – Gregg's nightblooming cereus
  Phellosperma tetrancistra (Engelm.) Britton & Rose – not accepted
  Toumeya papyracantha (Engelm.) Britton & Rose – not accepted
  Neomammillaria similis (Engelm.) Britton & Rose ex Rydb. – not accepted
  Juncus brachycephalus (Engelm.) Buchenau – accepted – small-head rush, smallhead rush
  Escobaria chlorantha (Engelm.) Buxb. – accepted
  Escobaria deserti (Engelm.) Buxb. – not accepted
  Escobaria neomexicana (Engelm.) Buxb. – not accepted
  Escobaria vivipara var. neomexicana (Engelm.) Buxb. – not accepted – New Mexico spinystar
  Stenocereus thurberi (Engelm.) Buxb. – accepted – organpipe cactus, Pitayo dulce
  Stenocereus thurberi ssp. thurberi (Engelm.) Buxb. – accepted
  Juncus ensifolius var. montanus (Engelm.) C.L. Hitchc. – not accepted – Rocky Mountain rush
  Equisetum hyemale var. elatum (Engelm.) C.V. Morton – not accepted
  Equisetum hyemale ssp. affine (Engelm.) Calder & Roy L. Taylor – accepted – prêle d'hiver, scouringrush horsetail
  Myosotis verna var. macrosperma (Engelm.) Chapm. – not accepted
  Isoetes bolanderi var. pygmaea (Engelm.) Clute – not accepted – pygmy quillwort
  Isoetes valida (Engelm.) Clute – not accepted – strong quillwort
  Opuntia littoralis (Engelm.) Cockerell – accepted – Nopal del litoral, coastal pricklypear
  Opuntia littoralis var. littoralis (Engelm.) Cockerell – accepted – coastal pricklypear
  Pediocactus simpsonii var. minor (Engelm.) Cockerell – not accepted – snowball cactus
  Phoradendron macrophyllum (Engelm.) Cockerell – not accepted – Colorado Desert mistletoe
  Phoradendron macrophyllum ssp. macrophyllum (Engelm.) Cockerell – not accepted – Colorado Desert mistletoe
  Melothria pendula var. chlorocarpa (Engelm.) Cogn. – not accepted
  Agave tigrina (Engelm.) Cory – not accepted
  Juncus robustus (Engelm.) Coville – not accepted
  Juncus texanus (Engelm.) Coville – accepted – Texas rush
  Juncus subcaudatus (Engelm.) Coville & S.F. Blake – accepted – woodland rush
  Juncus subcaudatus var. subcaudatus (Engelm.) Coville & S.F. Blake – not accepted – woodland rush
  Arceuthobium vaginatum var. cryptopodum (Engelm.) Cronquist – not accepted
  Oenothera pallida var. runcinata (Engelm.) Cronquist – not accepted
  Echinocereus caespitosus var. minor (Engelm.) D. Weniger – not accepted
  Echinocereus coccineus var. conoideus (Engelm.) D. Weniger – not accepted
  Echinocereus pectinatus var. ctenoides (Engelm.) D. Weniger – not accepted
  Mammillaria vivipara var. deserti (Engelm.) D. Weniger – not accepted
  Opuntia compressa var. fuscoatra (Engelm.) D. Weniger – not accepted
  Opuntia compressa var. grandiflora (Engelm.) D. Weniger – not accepted
  Opuntia phaeacantha var. tenuispina (Engelm.) D. Weniger – not accepted
  Sclerocactus spinosior (Engelm.) D. Woodruff & L.D. Benson – accepted – desert valley fishhook cactus, desert valley fish-hook cactus
  Sclerocactus spinosior ssp. spinosior (Engelm.) D. Woodruff & L.D. Benson – not accepted
  Glandulicactus wrightii (Engelm.) D.J. Ferguson – not accepted
  Escobaria missouriensis var. caespitosa (Engelm.) D.R. Hunt – not accepted
  Escobaria missouriensis var. robustior (Engelm.) D.R. Hunt – accepted – Missouri foxtail cactus
  Escobaria vivipara var. arizonica (Engelm.) D.R. Hunt – not accepted – Arizona spinystar, Arizona pincushion cactus
  Escobaria vivipara var. deserti (Engelm.) D.R. Hunt – not accepted – desert spinystar
  Escobaria vivipara var. radiosa (Engelm.) D.R. Hunt – not accepted – spinystar
  Mammillaria heyderi ssp. gummifera (Engelm.) D.R. Hunt – accepted
  Mammillaria heyderi ssp. hemisphaerica (Engelm.) D.R. Hunt – accepted
  Mammillaria heyderi ssp. meiacantha (Engelm.) D.R. Hunt – not accepted
  Mammillaria prolifera ssp. texana (Engelm.) D.R. Hunt – accepted
  Pachycereus schottii (Engelm.) D.R. Hunt – accepted – senita cactus
  Sclerocactus brevihamaticus (Engelm.) D.R. Hunt – not accepted
  Sclerocactus brevihamatus (Engelm.) D.R. Hunt – accepted – shorthook fishhook cactus
  Sclerocactus brevihamatus ssp. brevihamatus (Engelm.) D.R. Hunt – accepted
  Proboscidea arenaria (Engelm.) Decne. – not accepted
  Chamaesyce missurica var. petaloidea (Engelm.) Dorn – not accepted
  Euphorbia brachycera var. robusta (Engelm.) Dorn – not accepted
  Euphorbia missurica var. petaloidea (Engelm.) Dorn – not accepted
  Gentianella amarella var. heterosepala (Engelm.) Dorn – not accepted
  Polygonum douglasii var. microspermum (Engelm.) Dorn – not accepted
  Emorycactus parryi (Engelm.) Doweld – not accepted
  Poinsettia colorata (Engelm.) Dressler – not accepted
  Thelocactus setispinus (Engelm.) E.F. Anderson – accepted – miniature barrel cactus, Biznaga-pezón setosa, fishhook cactus
  Nuphar lutea ssp. polysepala (Engelm.) E.O. Beal – not accepted – Rocky Mountain pond-lily, Rocky Mountain cowlily, yellow pond-lily, Rocky Mountain pondlily
  Nuphar luteum var. polysepalum (Engelm.) E.O. Beal – not accepted
  Cereus enneacanthus (Engelm.) Engelm. – not accepted
  Echinocactus papyracanthus (Engelm.) Engelm. – not accepted
  Echinocereus caespitosus (Engelm.) Engelm. – not accepted
  Euphorbia flagelliformis (Engelm.) Engelm. – not accepted
  Mammillaria heyderi var. applanata (Engelm.) Engelm. – not accepted
  Mammillaria heyderi var. hemisphaerica (Engelm.) Engelm. – not accepted – little nipple cactus
  Mammillaria vivipara var. neomexicana (Engelm.) Engelm. – not accepted
  Opuntia phaeacantha var. brunnea (Engelm.) Engelm. – not accepted
  Opuntia phaeacantha var. nigricans (Engelm.) Engelm. – not accepted
  Phoradendron flavescens var. orbiculatum (Engelm.) Engelm. – not accepted
  Pinus balfouriana var. aristata (Engelm.) Engelm. – not accepted
  Pinus reflexa (Engelm.) Engelm. – not accepted
  Opuntia engelmannii var. dulcis (Engelm.) Engelm. ex K. Schum. – not accepted
  Vitis cinerea (Engelm.) Engelm. ex Millard – accepted – sweet grape, graybark grape
  Vitis cinerea var. cinerea (Engelm.) Engelm. ex Millard – accepted – graybark grape
  Echinocereus dubius (Engelm.) Engelm. ex Rümpler – not accepted
  Acanthocereus (Engelm. ex A. Berger) Britton & Rose – accepted – triangle cactus
  Isoetes riparia Engelm. ex A. Braun – accepted – shore quillwort, isoète riparien
  Isoetes riparia var. riparia Engelm. ex A. Braun – not accepted – shore quillwort
  Marsilea macropoda Engelm. ex A. Braun – accepted – bigfoot waterclover
  Marsilea tenuifolia Engelm. ex A. Braun – not accepted
  Marsilea vestita ssp. tenuifolia (Engelm. ex A. Braun) D.M. Johnson – not accepted – pepperwort, hairy pepperwort, hairy waterclover
  Quercus X tridentata (Engelm. ex A. DC.) Trel. (pro sp.) – accepted – tridentata oak
  Acalypha gracilens var. monococca Engelm. ex A. Gray – not accepted
  Aristida ramosissima Engelm. ex A. Gray – accepted – s-curve threeawn, s curve threeawn
  Aristida ramosissima var. ramosissima Engelm. ex A. Gray – accepted – s-curve threeawn
  Asclepias sullivantii Engelm. ex A. Gray – accepted – Sullivant's milkweed, prairie milkweed
  Astragalus lindheimeri Engelm. ex A. Gray – accepted – Lindheimer's milkvetch
  Calliandra herbacea Engelm. ex A. Gray – not accepted
  Cerastium nutans var. brachypodum Engelm. ex A. Gray – not accepted
  Corydalis aurea var. micrantha Engelm. ex A. Gray – not accepted
  Corydalis aurea var. occidentalis Engelm. ex A. Gray – not accepted
  Desmodium wislizeni Engelm. ex A. Gray – not accepted
  Eupatorium perfoliatum var. cuneatum Engelm. ex A. Gray – not accepted
  Euphorbia commutata Engelm. ex A. Gray – accepted – tinted woodland spurge, tinted euphorbia
  Euphorbia humistrata Engelm. ex A. Gray – accepted – spreading sandmat
  Gentiana oregana Engelm. ex A. Gray – not accepted
  Gentiana sceptrum var. humilis Engelm. ex A. Gray – not accepted
  Gonolobus reticulatus Engelm. ex A. Gray – not accepted
  Lewisia brachycalyx Engelm. ex A. Gray – accepted – short-sepal bitter-root, shortsepal bitterroot, shortsepal lewisia
  Maurandya wislizeni Engelm. ex A. Gray – not accepted
  Maurandya wislizenii Engelm. ex A. Gray – not accepted
  Menodora scoparia Engelm. ex A. Gray – not accepted
  Paronychia lindheimeri Engelm. ex A. Gray – accepted – forked nailwort
  Paronychia lindheimeri var. lindheimeri Engelm. ex A. Gray – accepted – forked nailwort, Lindheimer's nailwort
  Phelipaea erianthera Engelm. ex A. Gray – not accepted
  Phoradendron flavescens var. pubescens Engelm. ex A. Gray – not accepted
  Prunus minutiflora Engelm. ex A. Gray – accepted – Texas almond, smallflower peachbrush
  Rhus microphylla Engelm. ex A. Gray – accepted – littleleaf sumac
  Saxifraga debilis Engelm. ex A. Gray – accepted – weak saxifrage
  Sisymbrium incisum Engelm. ex A. Gray – not accepted
  Talinum spathulatum Engelm. ex A. Gray – not accepted
  Thalictrum fendleri Engelm. ex A. Gray – accepted – Fendler's meadowrue, Fendler's meadow-rue
  Thalictrum fendleri var. fendleri Engelm. ex A. Gray – not accepted – Fendler's meadowrue, Fendler's meadow-rue
  Vernonia lettermannii Engelm. ex A. Gray – accepted – narrowleaf ironweed, slimleaf ironweed
  Vitis candicans Engelm. ex A. Gray – not accepted
  Corydalis micrantha (Engelm. ex A. Gray) A. Gray – accepted – smallflower fumewort, smallflower corydalis
  Corydalis micrantha ssp. micrantha (Engelm. ex A. Gray) A. Gray – accepted – smallflower fumewort
  Cerastium brachypodum (Engelm. ex A. Gray) B.L. Rob. – accepted – bractpod chickweed, mouse-ear chickweed, short-stalk mouse-ear chickweed, shortstalk chickweed
  Capnoides micranthum (Engelm. ex A. Gray) Britton – not accepted
  Descurainia incisa (Engelm. ex A. Gray) Britton – accepted – mountain tansymustard
  Descurainia incisa ssp. incisa (Engelm. ex A. Gray) Britton – accepted – mountain tansymustard
  Descurainia incisa var. incisa (Engelm. ex A. Gray) Britton – not accepted
  Descurainia richardsonii ssp. incisa (Engelm. ex A. Gray) Detling – not accepted
  Saxifraga rivularis var. debilis (Engelm. ex A. Gray) Dorn – not accepted
  Eupatorium cuneatum (Engelm. ex A. Gray) Engelm. ex Small – not accepted
  Corydalis aurea ssp. occidentalis (Engelm. ex A. Gray) G.B. Ownbey – accepted – scrambled eggs, curvepod fumewort
  Acalypha gracilens ssp. monococca (Engelm. ex A. Gray) G.L. Webster – not accepted
  Sophia incisa (Engelm. ex A. Gray) Greene – not accepted
  Descurainia incana ssp. incisa (Engelm. ex A. Gray) Kartesz & Gandhi – not accepted – mountain tansy mustard, mountain tansymustard
  Anisophyllum humistratum (Engelm. ex A. Gray) Klotzsch & Garcke – not accepted
  Tithymalus commutatus (Engelm. ex A. Gray) Klotzsch & Garcke – not accepted
  Valerianella stenocarpa (Engelm. ex A. Gray) Krok – accepted – narrowcell cornsalad
  Meibomia wrightii (Engelm. ex A. Gray) Kuntze – not accepted
  Echinocereus triglochidiatus var. melanacanthus (Engelm. ex A. Gray) L.D. Benson – not accepted
  Acalypha monococca (Engelm. ex A. Gray) Lill. W. Mill. & Gandhi – accepted – slender threeseed mercury
  Phoradendron serotinum var. pubescens (Engelm. ex A. Gray) M.C. Johnst. – not accepted
  Epixiphium (Engelm. ex A. Gray) Munz – accepted
  Epixiphium wislizeni (Engelm. ex A. Gray) Munz – accepted – balloonbush
  Oenothera serrulata ssp. pinifolia (Engelm. ex A. Gray) Munz – not accepted
  Acalypha virginica var. monococca (Engelm. ex A. Gray) Müll. Arg. – not accepted
  Physaria recurvata (Engelm. ex A. Gray) O'Kane & Al-Shehbaz – accepted – gaslight bladderpod
  Asarina wislizeni (Engelm. ex A. Gray) Pennell – not accepted
  Lesquerella recurvata (Engelm. ex A. Gray) S. Watson – not accepted – gaslight bladderpod
  Chamaesyce humistrata (Engelm. ex A. Gray) Small – not accepted – spreading sandmat
  Galarhoeus commutatus (Engelm. ex A. Gray) Small ex Rydb. – not accepted
  Antirrhinum wislizeni (Engelm. ex A. Gray) Tidestr. – not accepted
  Calylophus berlandieri ssp. pinifolius (Engelm. ex A. Gray) Towner – not accepted – Berlandier's sundrops
  Calytophus berlandieri var. pinifolius (Engelm. ex A. Gray) Towner – not accepted
  Corydalis curvisiliqua ssp. occidentalis (Engelm. ex A. Gray) W.A. Weber – not accepted – curvepod fumewort
  Matelea reticulata (Engelm. ex A. Gray) Woodson – accepted – netted milkvine
  Saxifraga hyperborea ssp. debilis (Engelm. ex A. Gray) Á. Löve & D. Löve & B.M. Kapoor – not accepted
  Mammillaria fasciculata Engelm. ex B.D. Jacks. – not accepted
  Echinocereus fasciculatus (Engelm. ex B.D. Jacks.) L.D. Benson – accepted – Órgano-pequeño de manojos
  Echinocereus fasciculatus ssp. fasciculatus (Engelm. ex B.D. Jacks.) L.D. Benson – not accepted
  Echinocereus fendleri var. fasciculatus (Engelm. ex B.D. Jacks.) N.P. Taylor – not accepted – pinkflower hedgehog cactus, strawberry cactus
  Mimulus reniformis Engelm. ex Benth. – not accepted
  Cyperus refractus Engelm. ex Boeckeler – accepted – reflexed flatsedge
  Euphorbia asperifolia Engelm. ex Boiss. – not accepted
  Euphorbia astyla Engelm. ex Boiss. – accepted – alkali sandmat, Pecos spurge
  Euphorbia atrorubens Engelm. ex Boiss. – not accepted
  Euphorbia baueri Engelm. ex Boiss. – accepted
  Euphorbia calliadena Engelm. ex Boiss. – not accepted
  Euphorbia consanguinea Engelm. ex Boiss. – not accepted
  Euphorbia dentata var. linearis Engelm. ex Boiss. – not accepted
  Euphorbia floribunda Engelm. ex Boiss. – accepted
  Euphorbia fruticulosa Engelm. ex Boiss. – accepted
  Euphorbia fruticulosa var. fruticulosa Engelm. ex Boiss. – accepted
  Euphorbia greggii Engelm. ex Boiss. – accepted
  Euphorbia grisea Engelm. ex Boiss. – not accepted
  Euphorbia hortensis Engelm. ex Boiss. – not accepted
  Euphorbia leptocera Engelm. ex Boiss. – not accepted
  Euphorbia lindheimeriana Engelm. ex Boiss. – not accepted
  Euphorbia maculata var. detonsa Engelm. ex Boiss. – not accepted
  Euphorbia notata Engelm. ex Boiss. – not accepted
  Euphorbia ovalifolia var. schizosepala Engelm. ex Boiss. – not accepted
  Euphorbia pilosula Engelm. ex Boiss. – not accepted
  Euphorbia prostrata var. vestita Engelm. ex Boiss. – not accepted
  Euphorbia serpens var. indica Engelm. ex Boiss. – not accepted
  Euphorbia setiloba var. dentata Engelm. ex Boiss. – not accepted
  Euphorbia stipulacea Engelm. ex Boiss. – not accepted
  Euphorbia subserrata Engelm. ex Boiss. – not accepted
  Euphorbia tomentella Engelm. ex Boiss. – accepted
  Euphorbia umbellulata Engelm. ex Boiss. – accepted
  Euphorbia villifera var. nuda Engelm. ex Boiss. – not accepted
  Euphorbia xanti Engelm. ex Boiss. – accepted
  Euphorbia zygophylloides var. cymulosa Engelm. ex Boiss. – not accepted
  Chamaesyce pilosula (Engelm. ex Boiss.) Arthur – not accepted
  Tithymalus leptocerus (Engelm. ex Boiss.) Arthur – not accepted
  Euphorbia brachycera var. greggii (Engelm. ex Boiss.) M.C. Johnst. – not accepted
  Aklema xanti (Engelm. ex Boiss.) Millsp. – not accepted
  Chamaesyce astyla (Engelm. ex Boiss.) Millsp. – not accepted – alkali sandmat
  Chamaesyce floribunda (Engelm. ex Boiss.) Millsp. – not accepted
  Chamaesyce fruticulosa (Engelm. ex Boiss.) Millsp. – not accepted
  Chamaesyce grisea (Engelm. ex Boiss.) Millsp. – not accepted
  Chamaesyce radicans (Engelm. ex Boiss.) Millsp. – not accepted
  Chamaesyce umbellulata (Engelm. ex Boiss.) Millsp. – not accepted
  Euphorbia klotzschii var. schizosepala (Engelm. ex Boiss.) Oudejans – not accepted
  Mentzelia chrysantha Engelm. ex Brandegee – accepted – gold blazingstar
  Nuttallia chrysantha (Engelm. ex Brandegee) Greene – not accepted
  Yucca glauca var. mollis Engelm. ex Branner & Coville – not accepted
  Coryphantha arizonica (Engelm. ex Brew & Wats) Britton & Rose – not accepted
  Crataegus viridis var. nitida Engelm. ex Britton & A. Br. – not accepted
  Crataegus nitida (Engelm. ex Britton & A. Br.) Sarg. – accepted – glossy hawthorn
  Rudbeckia missouriensis Engelm. ex C.L. Boynt. & Beadle – accepted – Missouri orange coneflower, Missouri coneflower
  Rudbeckia fulgida var. missouriensis (Engelm. ex C.L. Boynt. & Beadle) Cronquist – not accepted
  Udora verticillata var. minor Engelm. ex Caspary – not accepted
  Elodea minor (Engelm. ex Caspary) Farw. – not accepted
  Philotria minor (Engelm. ex Caspary) Small – not accepted
  Euphorbia deltoidea Engelm. ex Chapm. – accepted – wedge sandmat
  Euphorbia deltoidea ssp. deltoidea Engelm. ex Chapm. – accepted – wedge sandmat
  Euphorbia deltoidea var. deltoidea Engelm. ex Chapm. – not accepted
  Euphorbia garberi Engelm. ex Chapm. – accepted – Garber's spurge, Garber's sandmat
  Chamaesyce deltoidea (Engelm. ex Chapm.) Small – not accepted – wedge sandmat
  Chamaesyce deltoidea ssp. deltoidea (Engelm. ex Chapm.) Small – not accepted – deltoid spurge, wedge sandmat
  Chamaesyce deltoidea ssp. deltoidea var. deltoidea (Engelm. ex Chapm.) Small – not accepted
  Chamaesyce garberi (Engelm. ex Chapm.) Small – not accepted – Garber's spurge, Garber's sandmat
  Aster vernalis Engelm. ex E.S. Burgess – not accepted
  Panicum capillare var. minimum Engelm. ex Gatt. – not accepted
  Panicum minimum (Engelm. ex Gatt.) Scribn. & Merr. – not accepted
  Agave utahensis var. nevadensis Engelm. ex Greenm. & Roush – accepted – Nevada agave
  Nasturtium calycinum Engelm. ex Hayden – not accepted
  Wolffia borealis (Engelm. ex Hegelm.) Landolt – accepted – northern watermeal, dotted watermeal, watermeal
  Euphorbia blodgettii Engelm. ex Hitchc. – accepted – limestone sandmat
  Chamaesyce blodgettii (Engelm. ex Hitchc.) Small – not accepted – limestone sandmat
  Euphorbia polyphylla Engelm. ex Holz. – accepted – Lesser Florida spurge
  Agaloma polyphylla (Engelm. ex Holz.) Nieuwl. – not accepted
  Tithymalopsis polyphylla (Engelm. ex Holz.) Small – not accepted
  Sagittaria longiloba Engelm. ex J.G. Sm. – accepted – long-barb arrowhead, longlobe arrowhead, longbarb arrowhead
  Echinocactus sileri Engelm. ex J.M. Coult. – not accepted
  Echinocactus xeranthemoides Engelm. ex J.M. Coult. – not accepted
  Mammillaria gabbii Engelm. ex J.M. Coult. – not accepted
  Mammillaria setispina Engelm. ex J.M. Coult. – not accepted
  Opuntia ciribe Engelm. ex J.M. Coult. – not accepted
  Opuntia pycnantha Engelm. ex J.M. Coult. – accepted
  Opuntia rubrifolia Engelm. ex J.M. Coult. – not accepted
  Opuntia tapona Engelm. ex J.M. Coult. – not accepted
  Opuntia tesajo Engelm. ex J.M. Coult. – not accepted
  Opuntia versicolor Engelm. ex J.M. Coult. – not accepted – Cholla versicolor, staghorn cholla
  Opuntia versicolor var. versicolor Engelm. ex J.M. Coult. – not accepted
  Opuntia versicolor var. violacea Engelm. ex J.M. Coult. – not accepted
  Echinocereus mamillatus (Engelm. ex J.M. Coult.) Britton & Rose – not accepted
  Pachycereus calvus (Engelm. ex J.M. Coult.) Britton & Rose – not accepted
  Utahia sileri (Engelm. ex J.M. Coult.) Britton & Rose – not accepted
  Cylindropuntia clavellina (Engelm. ex J.M. Coult.) F.M. Knuth – not accepted
  Cylindropuntia tesajo (Engelm. ex J.M. Coult.) F.M. Knuth – accepted
  Cylindropuntia versicolor (Engelm. ex J.M. Coult.) F.M. Knuth – accepted
  Pediocactus sileri (Engelm. ex J.M. Coult.) L.D. Benson – accepted – Siler's pincushion cactus
  Cylindropuntia bigelovii var. ciribe (Engelm. ex J.M. Coult.) Rebman – accepted
  Celtis lindheimeri Engelm. ex K. Koch – accepted – palo blanco, Lindheimer's hackberry
  Epiphyllanthus obovatus (Engelm. ex K. Schum.) Britton & Rose – not accepted
  Anisophyllum ovalifolium Engelm. ex Klotzsch – not accepted
  Euphorbia serpens var. ovalifolia (Engelm. ex Klotzsch) Allem – not accepted
  Euphorbia ovalifolia (Engelm. ex Klotzsch) Boiss. – not accepted
  Chamaesyce ovalifolia (Engelm. ex Klotzsch) Croizat – not accepted
  Lythrum ovalifolium Engelm. ex Koehne – accepted – low loosestrife
  Smilax ecirrata (Engelm. ex Kunth) S. Watson – not accepted – upright carrionflower, greenbriar, upright carrion-flower
  Smilax ecirrhata (Engelm. ex Kunth) S. Watson – accepted – upright carrionflower
  Nemexia ecirrata (Engelm. ex Kunth) Small – not accepted
  Nemexia ecirrhata (Engelm. ex Kunth) Small – not accepted
  Vitis riparia var. praecox Engelm. ex L.H. Bailey – not accepted
  Vitis vulpina var. praecox (Engelm. ex L.H. Bailey) L.H. Bailey – not accepted
  Potentilla millegrana Engelm. ex Lehm. – not accepted
  Potentilla rivalis var. millegrana (Engelm. ex Lehm.) S. Watson – not accepted – brook cinquefoil
  Colubrina stricta Engelm. ex M.C. Johnst. – accepted – Comal nakedwood, Comal snakewood
  Euphorbia serpyllifolia var. rugulosa Engelm. ex Millsp. – not accepted
  Euphorbia rugulosa (Engelm. ex Millsp.) Greene – not accepted
  Chamaesyce rugulosa (Engelm. ex Millsp.) Rydb. – not accepted
  Sparganium androcladum var. fluctuans Engelm. ex Morong – not accepted
  Sparganium fluctuans (Engelm. ex Morong) B.L. Rob. – accepted – floating bur-reed
  Arceuthobium abietinum Engelm. ex Munz – not accepted – fir dwarf mistletoe
  Cereus phoeniceus var. pacificus Engelm. ex Orcutt – not accepted
  Echinocereus polyacanthus ssp. pacificus (Engelm. ex Orcutt) Breckw. – not accepted
  Echinocereus pacificus (Engelm. ex Orcutt) Britton & Rose – accepted
  Echinocereus polyacanthus var. pacificus (Engelm. ex Orcutt) N.P. Taylor – not accepted
  Pinus greggii Engelm. ex Parl. – accepted
  Tetracoccus Engelm. ex Parry – accepted – shrubby-spurge
  Euphorbia peplofolia Engelm. ex Patt. – not accepted
  Ephedra aspera Engelm. ex S. Watson – accepted – Mormon tea, rough jointfir, aspera Mormon tea, boundary ephedra
  Ephedra pedunculata Engelm. ex S. Watson – accepted – vine jointfir, vine ephedra
  Euphorbia hirtula Engelm. ex S. Watson – not accepted
  Euphorbia palmeri Engelm. ex S. Watson – not accepted – wood spurge, woodland spurge
  Euphorbia palmeri var. palmeri Engelm. ex S. Watson – not accepted – woodland spurge
  Euphorbia platysperma Engelm. ex S. Watson – accepted – flatseed sandmat, flat-seeded spurge, dune spurge
  Euphorbia subpubens Engelm. ex S. Watson – not accepted
  Pinus contorta var. latifolia Engelm. ex S. Watson – accepted – lodgepole pine, Rocky Mountain lodgepole pine, tall lodgepole pine
  Echinodorus rostratus var. lanceolatus Engelm. ex S. Watson & J.M. Coult. – not accepted
  Echinodorus berteroi var. lanceolatus (Engelm. ex S. Watson & J.M. Coult.) Fassett – not accepted
  Pinus divaricata var. latifolia (Engelm. ex S. Watson) B. Boivin – not accepted
  Pachycereus pecten-aboriginum (Engelm. ex S. Watson) Britton & Rose – accepted
  Pinus contorta ssp. latifolia (Engelm. ex S. Watson) Critchfield – not accepted – black pine, Rocky Mountain lodgepole pine
  Tithymalus palmeri (Engelm. ex S. Watson) Dayton – not accepted
  Toxicodendron radicans ssp. pubens (Engelm. ex S. Watson) Gillis – accepted – eastern poison ivy
  Ammoselinum butleri (Engelm. ex S. Watson) J.M. Coult. & Rose – accepted – Butler's sandparsley
  Chamaesyce serpyllifolia ssp. hirtella (Engelm. ex S. Watson) Koutnik – not accepted – thymeleaf sandmat
  Chamaesyce serpyllifolia var. hirtella (Engelm. ex S. Watson) L.C. Wheeler – not accepted
  Euphorbia palmeri var. subpubens (Engelm. ex S. Watson) L.C. Wheeler – not accepted – woodland spurge
  Euphorbia serpyllifolia var. hirtella (Engelm. ex S. Watson) L.C. Wheeler – accepted – thymeleaf sandmat
  Euphorbia serpyllifolia var. hirtula (Engelm. ex S. Watson) L.C. Wheeler – accepted – Thymeleaf sandmat
  Ephedra nevadensis var. aspera (Engelm. ex S. Watson) L.D. Benson – not accepted
  Chamaesyce hirtula (Engelm. ex S. Watson) Millsp. – not accepted
  Tithymalus subpubens (Engelm. ex S. Watson) Norton – not accepted
  Euphorbia serpyllifolia ssp. hirtella (Engelm. ex S. Watson) Oudejans – not accepted
  Toxicodendron radicans var. pubens (Engelm. ex S. Watson) Reveal – not accepted
  Chamaesyce platysperma (Engelm. ex S. Watson) Shinners – not accepted – flat-seed sandmat, flatseed sandmat, flat-seeded spurge
  Cereus nudiflorus Engelm. ex Sauvalle – not accepted
  Dendrocereus nudiflorus (Engelm. ex Sauvalle) Britton & Rose – accepted
  Acerates auriculata Engelm. ex Torr. – not accepted
  Asclepias brachystephana Engelm. ex Torr. – accepted – bract milkweed, shortcrown milkweed, short-crowned milkweed
  Asclepias involucrata Engelm. ex Torr. – accepted – dwarf milkweed
  Euphorbia leptocera Engelm. ex Torr. – not accepted
  Euphorbia setiloba Engelm. ex Torr. – accepted – Yuma sandmat, fringed spurge, shaggy spurge
  Juglans rupestris Engelm. ex Torr. – not accepted
  Styrax platanifolius Engelm. ex Torr. – accepted – sycamoreleaf snowbell
  Styrax platanifolius ssp. platanifolius Engelm. ex Torr. – accepted – sycamoreleaf snowbell
  Aster anomalus Engelm. ex Torr. & A. Gray – not accepted – manyray aster
  Potentilla pentandra Engelm. ex Torr. & A. Gray – not accepted
  Symphyotrichum anomalum (Engelm. ex Torr. & A. Gray) G.L. Nesom – accepted – manyray aster
  Potentilla rivalis var. pentandra (Engelm. ex Torr. & A. Gray) S. Watson – not accepted – brook cinquefoil, cinquefoil
  Asclepias auriculata (Engelm. ex Torr.) Holz. – not accepted
  Philibertia heterophylla (Engelm. ex Torr.) Jeps. – not accepted
  Funastrum cynanchoides ssp. heterophyllum (Engelm. ex Torr.) Kartesz – not accepted – Hartweg's twinevine
  Chamaesyce setiloba (Engelm. ex Torr.) Millsp. – not accepted – Yuma spurge, Yuma sandmat
  Agave maculata Engelm. ex Torr., non Regel – not accepted
  Chamaesyce setiloba (Engelm. ex Torr.) Norton – not accepted
  Funastrum heterophyllum (Engelm. ex Torr.) Standl. – not accepted
  Dasylirion leiophyllum Engelm. ex Trel. – accepted – Sotol brillante, smooth sotol, green sotol
  Yucca angustissima Engelm. ex Trel. – accepted – narrowleaf yucca
  Yucca angustissima var. angustissima Engelm. ex Trel. – accepted – narrowleaf yucca, fineleaf yucca
  Yucca rostrata Engelm. ex Trel. – accepted – Izote Kikapú, beaked yucca
  Agave parryi var. couesii (Engelm. ex Trel.) Kearney & Peebles – not accepted
  Aristida basiramea Engelm. ex Vasey – accepted – forked threeawn, forked three-awn
  Aristida basiramea var. basiramea Engelm. ex Vasey – not accepted
  Paspalum floridanum var. glabratum Engelm. ex Vasey – accepted
  Paspalum glabratum (Engelm. ex Vasey) C. Mohr – not accepted
  Nuphar luteum var. variegatum (Engelm. ex. Clinton) E.O. Beal – not accepted
  Echinocereus stramineus (Engelm.) F. Seitz – accepted – Órgano-pequeño sanjuanero, strawberry hedgehog cactus
  Echinocereus stramineus ssp. stramineus (Engelm.) F. Seitz – accepted
  Juncus mertensianus ssp. gracilis (Engelm.) F.J. Herm. – not accepted
  Corynopuntia bulbispina (Engelm.) F.M. Knuth – accepted
  Cylindropuntia (Engelm.) F.M. Knuth – accepted
  Cylindropuntia arbuscula (Engelm.) F.M. Knuth – accepted
  Cylindropuntia bigelovii (Engelm.) F.M. Knuth – accepted
  Cylindropuntia bigelovii var. bigelovii (Engelm.) F.M. Knuth – accepted
  Cylindropuntia ciribe (Engelm.) F.M. Knuth – not accepted
  Cylindropuntia fulgida (Engelm.) F.M. Knuth – accepted
  Cylindropuntia fulgida var. fulgida (Engelm.) F.M. Knuth – accepted
  Cylindropuntia parryi (Engelm.) F.M. Knuth – not accepted
  Cylindropuntia prolifera (Engelm.) F.M. Knuth – accepted
  Cylindropuntia ramosissima (Engelm.) F.M. Knuth – accepted
  Cylindropuntia spinosior (Engelm.) F.M. Knuth – accepted
  Cylindropuntia thurberi (Engelm.) F.M. Knuth – accepted
  Echinodorus tenellus var. parvulus (Engelm.) Fassett – not accepted
  Isoetes lacustris ssp. paupercula (Engelm.) Feilberg – not accepted
  Echinocereus coccineus var. paucispinus (Engelm.) Ferguson – not accepted – scarlet hedgehog cactus
  Eriophorum viridicarinatum (Engelm.) Fernald – accepted – tassel cotton-grass, thinleaf cottonsedge
  Euphorbia dentata f. cuphosperma (Engelm.) Fernald – not accepted
  Juncus brevicaudatus (Engelm.) Fernald – accepted – narrow-panicle rush, narrowpanicle rush
  Myosotis virginica var. macrosperma (Engelm.) Fernald – not accepted
  Nymphozanthus polysepalus (Engelm.) Fernald – not accepted
  Chilopsis linearis var. glutinosa (Engelm.) Fosberg – not accepted
  Platyopuntia (Engelm.) Fric & Schelle ex Kreuz. – not accepted
  Ehrendorferia ochroleuca (Engelm.) Fukuhara – not accepted – yellow bleeding heart
  Echinocereus pectinatus ssp. ctenoides (Engelm.) G. Frank – accepted
  Zeltnera nudicaulis (Engelm.) G. Mans. – accepted – Santa Catalina Mountain centaury
  Ferocactus acanthodes var. lecontei (Engelm.) G.E. Linds. – not accepted
  Cuscuta pentagona var. glabrior (Engelm.) Gandhi, R.D. Thomas & S.L. Hatch – not accepted – field dodder, bushclover dodder
  Quercus garryana var. fruticosa (Engelm.) Govaerts – not accepted – Oregon white oak
  Nymphaea polysepala (Engelm.) Greene – not accepted
  Pneumonanthe parryi (Engelm.) Greene – not accepted
  Polygonum douglasii var. latifolium (Engelm.) Greene – not accepted
  Ferocactus cylindraceus var. lecontei (Engelm.) H. Bravo – not accepted – Leconte's barrel cactus, redspine barrel cactus
  Grusonia bulbispina (Engelm.) H. Rob. – not accepted
  Grusonia clavata (Engelm.) H. Rob. – accepted
  Grusonia grahamii (Engelm.) H. Rob. – accepted
  Grusonia pulchella (Engelm.) H. Rob. – accepted
  Grusonia schottii (Engelm.) H. Rob. – accepted
  Distichlis littoralis (Engelm.) H.L. Bell & Columbus – accepted
  Grammica cephalanthi (Engelm.) Hadac & Chrtek – not accepted
  Grammica coryli (Engelm.) Hadac & Chrtek – not accepted
  Grammica cuspidata (Engelm.) Hadac & Chrtek – not accepted
  Pediocactus brevihamatus (Engelm.) Halda – not accepted
  Pediocactus intertextus (Engelm.) Halda – not accepted
  Pediocactus spinosior (Engelm.) Halda – not accepted
  Pediocactus unguispinus (Engelm.) Halda – not accepted
  Arceuthobium microcarpum (Engelm.) Hawksw. & Wiens – not accepted – western spruce dwarf mistletoe
  Arceuthobium vaginatum ssp. cryptopodum (Engelm.) Hawksw. & Wiens – accepted – pineland dwarf mistletoe, ponderosa pine dwarf mistletoe
  Callitriche deflexa var. austinii (Engelm.) Hegelm. – not accepted
  Cuscuta indecora var. neuropetala (Engelm.) Hitchc. – not accepted – bigseed dodder, bigseed alfalfa dodder
  Pediocactus simpsonii ssp. bensonii (Engelm.) Hochstätter – not accepted
  Gentianella heterosepala (Engelm.) Holub – not accepted
  Euphorbia heterophylla var. barbellata (Engelm.) Holz. – not accepted
  Phoradendron libocedri (Engelm.) Howell – not accepted – incense cedar mistletoe
  Juncus arcticus ssp. littoralis (Engelm.) Hultén – not accepted – mountain rush
  Hesperhodos minutifolius (Engelm.) Hurst – not accepted
  Gentianopsis barbellata (Engelm.) Iltis – accepted – perennial fringed-gentian, perennial fringed gentian
  Portulaca umbraticola ssp. lanceolata (Engelm.) J.F. Matthews & Ketron – accepted – wingpod purslane
  Lophotocarpus calycinus (Engelm.) J.G. Sm. – not accepted
  Lophotocarpus spongiosus (Engelm.) J.G. Sm. – not accepted
  Sagittaria platyphylla (Engelm.) J.G. Sm. – accepted – delta arrowhead
  Opuntia echinocarpa var. parkeri (Engelm.) J.M. Coult. – not accepted
  Gentiana amarella ssp. heterosepala (Engelm.) J.M. Gillett – not accepted
  Gentianella amarella ssp. heterosepala (Engelm.) J.M. Gillett – accepted – autumn dwarf gentian, dwarf gentian
  Gentianella barbellata (Engelm.) J.M. Gillett – not accepted
  Gentianella wislizeni (Engelm.) J.M. Gillett – accepted – Chiricahua Mountain dwarf gentian, Chiricahua dwarf gentian
  Gentianella wislizenii (Engelm.) J.M. Gillett – not accepted
  Echinocereus berlandieri (Engelm.) J.N. Haage – accepted – Órgano-pequeño de Berlandier, Berlandier's hedgehog cactus
  Echinocereus chloranthus (Engelm.) J.N. Haage – not accepted – Órgano-pequeño de flor verde, brownspine hedgehog cactus
  Echinocereus chloranthus var. chloranthus (Engelm.) J.N. Haage – not accepted – brownspine hedgehog cactus
  Echinocereus rigidissimus (Engelm.) J.N. Haage – accepted – rainbow hedgehog cactus
  Echinocereus rigidissimus ssp. rigidissimus (Engelm.) J.N. Haage – accepted
  Quercus garryana var. breweri (Engelm.) Jeps. – accepted – Oregon white oak
  Ariocarpus fissuratus (Engelm.) K. Schum. – accepted – chautle livingrock, Biznaga peyotillo
  Ariocarpus fissuratus var. fissuratus (Engelm.) K. Schum. – not accepted
  Juniperus occidentalis var. utahensis (Engelm.) Kent – not accepted
  Phemeranthus aurantiacus (Engelm.) Kiger – accepted – orange fameflower
  Phemeranthus calycinus (Engelm.) Kiger – accepted – largeflower fameflower
  Anisophyllum geyeri (Engelm.) Klotzsch & Garcke – not accepted
  Thelocactus bicolor var. schottii (Engelm.) Krainz – not accepted
  Phoradendron serotinum ssp. macrophyllum (Engelm.) Kuijt – accepted – Colorado Desert mistletoe
  Calamaria saccharata (Engelm.) Kuntze – not accepted
  Capnoides crystallinum (Engelm.) Kuntze – not accepted
  Euphorbia missurica var. intermedia (Engelm.) L.C. Wheeler – not accepted
  Ancistrocactus uncinatus var. wrightii (Engelm.) L.D. Benson – not accepted
  Coryphantha cornifera var. echinus (Engelm.) L.D. Benson – not accepted – rhinoceros cactus
  Coryphantha missouriensis var. caespitosa (Engelm.) L.D. Benson – not accepted
  Coryphantha missouriensis var. robustior (Engelm.) L.D. Benson – not accepted
  Coryphantha scheeri var. valida (Engelm.) L.D. Benson – not accepted – Scheer's beehive cactus, pineapple cactus
  Echinocereus enneacanthus var. dubius (Engelm.) L.D. Benson – not accepted
  Echinocereus enneacanthus var. stramineus (Engelm.) L.D. Benson – not accepted
  Echinocereus pectinatus var. minor (Engelm.) L.D. Benson – not accepted
  Echinocereus triglochidiatus var. polyacanthus (Engelm.) L.D. Benson – not accepted
  Ferocactus setispinus (Engelm.) L.D. Benson – not accepted
  Mammillaria gummifera var. applanata (Engelm.) L.D. Benson – not accepted
  Mammillaria gummifera var. hemisphaerica (Engelm.) L.D. Benson – not accepted
  Mammillaria gummifera var. meiacantha (Engelm.) L.D. Benson – not accepted
  Mammillaria heyderi var. gummifera (Engelm.) L.D. Benson – not accepted
  Mammillaria heyderi var. meiacantha (Engelm.) L.D. Benson – not accepted – little nipple cactus
  Mammillaria vivipara var. arizonica (Engelm.) L.D. Benson – not accepted
  Neolloydia intertexta (Engelm.) L.D. Benson – not accepted
  Neolloydia intertexta var. dasyacantha (Engelm.) L.D. Benson – not accepted
  Neolloydia unguispina (Engelm.) L.D. Benson – not accepted
  Opuntia compressa var. macrorhiza (Engelm.) L.D. Benson – not accepted
  Opuntia compressa var. microsperma (Engelm.) L.D. Benson – not accepted
  Opuntia erinacea var. utahensis (Engelm.) L.D. Benson – not accepted – Utah grizzlybear pricklypear, Utah pricklypear
  Opuntia parryi var. serpentina (Engelm.) L.D. Benson – not accepted – serpentine cholla, snake cholla
  Opuntia schottii var. grahamii (Engelm.) L.D. Benson – not accepted
  Opuntia violacea var. macrocentra (Engelm.) L.D. Benson – not accepted
  Pediocactus papyracanthus (Engelm.) L.D. Benson – not accepted – paper-spined cactus
  Phoradendron tomentosum var. macrophyllum (Engelm.) L.D. Benson – not accepted
  Ranunculus laxicaulis var. angustifolia (Engelm.) L.D. Benson – not accepted
  Ranunculus laxicaulis var. angustifolius (Engelm.) L.D. Benson – not accepted
  Ranunculus pusillus var. angustifolius (Engelm.) L.D. Benson – not accepted – low spearwort
  Sclerocactus pubispinus (Engelm.) L.D. Benson – accepted – Great Basin fishhook cactus
  Sclerocactus pubispinus var. pubispinus (Engelm.) L.D. Benson – not accepted
  Vitis cinerea var. canescens (Engelm.) L.H. Bailey – not accepted
  Coryphantha (Engelm.) Lem. – accepted – beehive cactus
  Coryphantha macromeris (Engelm.) Lem. – accepted – Biznaga-partida partida, nipple beehive cactus
  Coryphantha macromeris ssp. macromeris (Engelm.) Lem. – accepted
  Coryphantha macromeris var. macromeris (Engelm.) Lem. – not accepted – nipple beehive cactus
  Juniperus utahensis (Engelm.) Lemmon – not accepted
  Pinus ayacahuite var. strobiformis (Engelm.) Lemmon – not accepted
  Pinus ponderosa var. brachyptera (Engelm.) Lemmon – accepted – ponderosa pine
  Pinus scopulorum (Engelm.) Lemmon – not accepted
  Funastrum utahense (Engelm.) Liede & Meve – accepted – Utah swallow-wort
  Cuscuta gronovii var. saururi (Engelm.) MacMill. – not accepted
  Lobelia cardinalis ssp. graminea var. phyllostachya (Engelm.) McVaugh – not accepted – cardinalflower
  Lobelia cardinalis var. phyllostachya (Engelm.) McVaugh – not accepted
  Chamaesyce capitellata (Engelm.) Millsp. – not accepted – head sandmat
  Chamaesyce florida (Engelm.) Millsp. – not accepted – Chiricahua Mountain sandmat
  Chamaesyce indivisa (Engelm.) Millsp. – not accepted
  Chamaesyce pycnanthema (Engelm.) Millsp. – not accepted
  Chamaesyce trachysperma (Engelm.) Millsp. – not accepted – San Pedro River sandmat
  Eumecanthus bifurcatus (Engelm.) Millsp. – not accepted
  Poinsettia graminifolia (Engelm.) Millsp. – not accepted
  Poinsettia dentata var. cuphosperma (Engelm.) Mohlenbr. – not accepted
  Sparganium androcladum (Engelm.) Morong – accepted – branched bur-reed, branching bur-reed, branched burreed
  Mammillaria microcarpa ssp. grahamii (Engelm.) Mottram – not accepted
  Euphorbia polycarpa var. appendiculata (Engelm.) Munz – not accepted
  Oenothera runcinata (Engelm.) Munz – not accepted
  Oenothera runcinata var. brevifolia (Engelm.) Munz – not accepted
  Oenothera pallida ssp. runcinata (Engelm.) Munz & W.M. Klein – accepted – pale evening-primrose, pale eveningprimrose, pale evening primrose
  Echinocereus chloranthus var. cylindricus (Engelm.) N.P. Taylor – not accepted – brownspine hedgehog cactus
  Echinocereus pectinatus var. dasyacanthus (Engelm.) N.P. Taylor – not accepted – rainbow cactus
  Echinocereus viridiflorus ssp. chloranthus (Engelm.) N.P. Taylor – accepted
  Echinocereus viridiflorus ssp. cylindricus (Engelm.) N.P. Taylor – accepted – nylon hedgehog cactus
  Epithelantha micromeris ssp. greggii (Engelm.) N.P. Taylor – not accepted
  Escobaria missouriensis var. similis (Engelm.) N.P. Taylor – accepted – Missouri foxtail cactus
  Ferocactus cylindraceus ssp. lecontei (Engelm.) N.P. Taylor – accepted
  Ferocactus cylindraceus var. eastwoodiae (Engelm.) N.P. Taylor – not accepted – California barrel cactus, yellowspine barrel cactus
  Ferocactus emoryi ssp. rectispinus (Engelm.) N.P. Taylor – accepted
  Ferocactus pubispinus (Engelm.) N.P. Taylor – not accepted
  Ferocactus spinosior (Engelm.) N.P. Taylor – not accepted
  Ferocactus uncinatus var. wrightii (Engelm.) N.P. Taylor – not accepted
  Sclerocactus intertextus (Engelm.) N.P. Taylor – accepted – white fishhook cactus, white fish-hook cactus, Biznaga-bola entretejida
  Sclerocactus intertextus var. dasyacanthus (Engelm.) N.P. Taylor – not accepted – white fishhook cactus
  Sclerocactus intertextus var. intertextus (Engelm.) N.P. Taylor – not accepted – white fishhook cactus
  Sclerocactus papyracanthus (Engelm.) N.P. Taylor – accepted – paperspine fishhook cactus, Biznaga-bola de espinas de papel
  Sclerocactus uncinatus ssp. wrightii (Engelm.) N.P. Taylor – accepted
  Sclerocactus uncinatus var. wrightii (Engelm.) N.P. Taylor – not accepted – Chihuahuan fishhook cactus, Wright's fishhook cactus
  Sclerocactus unguispinus (Engelm.) N.P. Taylor – accepted
  Mammillaria milleri var. grahamii (Engelm.) Neutel. – not accepted
  Agaloma curtisii (Engelm.) Nieuwl. – not accepted
  Juncus obtusatus Engelm., non Kit. – not accepted
  Yucca macrocarpa Engelm., non Merriam – not accepted
  Euphorbia chamaesula var. subdentata (Engelm.) Norton – not accepted
  Euphorbia leiococca (Engelm.) Norton – not accepted
  Euphorbia mexicana (Engelm.) Norton – not accepted
  Tithymalus schizolobus (Engelm.) Norton – not accepted
  Coryphantha dasyacantha (Engelm.) Orcutt – not accepted
  Coryphantha dasyacantha var. dasyacantha (Engelm.) Orcutt – not accepted
  Coryphantha echinus (Engelm.) Orcutt – accepted
  Epithelantha greggii (Engelm.) Orcutt – not accepted
  Ferocactus cylindraceus (Engelm.) Orcutt – accepted – Biznaga-barril cilíndrica, California barrel cactus
  Ferocactus cylindraceus ssp. cylindraceus (Engelm.) Orcutt – accepted
  Ferocactus cylindraceus var. cylindraceus (Engelm.) Orcutt – not accepted – California barrel cactus, campus barrel cactus
  Ferocactus emoryi (Engelm.) Orcutt – accepted – Biznaga-barril de Emory, Emory's barrel cactus
  Ferocactus emoryi ssp. emoryi (Engelm.) Orcutt – accepted
  Euphorbia spathulata var. mexicana (Engelm.) Oudejans – not accepted
  Opuntia occidentalis var. littoralis (Engelm.) Parish – not accepted
  Agalinis spiciflora (Engelm.) Pennell – not accepted
  Grusonia emoryi (Engelm.) Pinkava – accepted
  Juncus brachystylus (Engelm.) Piper – not accepted
  Talinum paniculatum var. sarmentosum (Engelm.) Poelln. – not accepted – jewels of Opar
  Baptisia X sulphurea Engelm. (pro. sp.) – accepted – sulphur wild indigo
  Yucca X schottii Engelm. (pro. sp.) – accepted – Schott's yucca
  Dimorphocarpa wislizeni (Engelm.) Rollins – accepted – spectacle pod, spectaclepod, Wislizeni's spectaclepod, touristplant
  Dimorphocarpa wislizenii (Engelm.) Rollins – not accepted
  Alsine obtusa (Engelm.) Rose – not accepted
  Manfreda virginica var. tigrina (Engelm.) Rose – not accepted
  Chamaesyce pediculifera (Engelm.) Rose & Standl. – not accepted – Carrizo Mountain sandmat
  Grammica salina (Engelm.) Roy L. Taylor & MacBryde – 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
  Echinocereus ctenoides (Engelm.) Rümpler – not accepted
  Echinocereus fendleri (Engelm.) Rümpler – not accepted – Órgano-pequeño de Nuevo México, pinkflower hedgehog cactus, Fendler's hedgehog cactus
  Echinocereus longisetus (Engelm.) Rümpler – accepted
  Echinocereus longisetus ssp. longisetus (Engelm.) Rümpler – accepted
  Echinocereus pectinatus var. rigidissimus (Engelm.) Rümpler – not accepted
  Echinocereus phoeniceus (Engelm.) Rümpler – not accepted
  Echinocereus phoeniceus var. phoeniceus (Engelm.) Rümpler – not accepted
  Echinocereus viridiflorus var. cylindricus (Engelm.) Rümpler – not accepted – nylon hedgehog cactus
  Echinocereus X roetteri (Engelm.) Rümpler – accepted
  Juncus arcticus var. montanus (Engelm.) S.L. Welsh – not accepted
  Sclerocactus pubispinus var. spinosior (Engelm.) S.L. Welsh – not accepted
  Juniperus monosperma (Engelm.) Sarg. – accepted – oneseed juniper, enebro de sombra
  Quercus chrysolepis var. palmeri (Engelm.) Sarg. – not accepted
  Quercus chrysolepis var. palneri (Engelm.) Sarg. – not accepted
  Echinocereus fendleri (Engelm.) Sencke ex J.N. Haage – accepted
  Echinocereus fendleri ssp. fendleri (Engelm.) Sencke ex J.N. Haage – accepted
  Echinocereus fendleri var. fendleri (Engelm.) Sencke ex J.N. Haage – not accepted – pinkflower hedgehog cactus, Fendler's hedgehog cactus
  Pinus leiophylla var. chihuahuana (Engelm.) Shaw – accepted – Chihuahuan pine, yellow pine, pino real
  Pinus ponderosa var. arizonica (Engelm.) Shaw – not accepted
  Cathartolinum aristatum (Engelm.) Small – not accepted
  Cathartolinum puberulum (Engelm.) Small – not accepted
  Chamaesyce angusta (Engelm.) Small – not accepted – blackfoot sandmat
  Chamaesyce cinerascens (Engelm.) Small – not accepted – ashy sandmat
  Chamaesyce geyeri (Engelm.) Small – not accepted – Geyer's spurge, Geyer's sandmat
  Chamaesyce geyeri var. geyeri (Engelm.) Small – not accepted – Geyer's sandmat
  Chamaesyce glyptosperma (Engelm.) Small – not accepted – ridgeseed spurge, rib-seed sandmat, ribseed sandmat
  Chamaesyce lata (Engelm.) Small – not accepted – hoary spurge, hoary sandmat
  Chamaesyce nuttallii (Engelm.) Small – not accepted
  Chamaesyce petaloidea (Engelm.) Small – not accepted
  Chamaesyce revoluta (Engelm.) Small – not accepted – thread-stem sandmat, threadstem spurge, threadstem sandmat
  Chamaesyce stictospora (Engelm.) Small – not accepted – slim-seed sandmat, slimseed spurge, slimseed sandmat
  Cuscuta glandulosa (Engelm.) Small – not accepted
  Euphorbia nuttallii (Engelm.) Small – not accepted
  Euphorbia robusta (Engelm.) Small – not accepted – robust spurge, Rocky Mountain spurge
  Helianthium parvulum (Engelm.) Small – not accepted
  Manfreda tigrina (Engelm.) Small – not accepted
  Poinsettia barbellata (Engelm.) Small – not accepted
  Poinsettia cuphosperma (Engelm.) Small – not accepted
  Polygonum microspermum (Engelm.) Small – not accepted
  Tithymalopsis curtisii (Engelm.) Small – not accepted
  Tithymalus brachycera (Engelm.) Small – not accepted
  Tithymalus brachycerus (Engelm.) Small – not accepted
  Tithymalus leiococcus (Engelm.) Small – not accepted
  Tithymalus peplidion (Engelm.) Small – not accepted
  Tithymalus robustus (Engelm.) Small – not accepted
  Tithymalus tetraporus (Engelm.) Small – not accepted
  Juncus balticus ssp. littoralis (Engelm.) Snogerup – accepted – Baltic rush
  Zygophyllidium bilobatum (Engelm.) Standl. – not accepted
  Euphorbia indivisa (Engelm.) Tidestr. – accepted – royal sandmat
  Bouteloua pappilosa (Engelm.) Torr. – not accepted
  Chondrosum papillosum (Engelm.) Torr. – not accepted
  Opuntia spinosior (Engelm.) Toumey – not accepted – Cholla tasajillo de Arizona, walkingstick cactus, cane cholla
  Opuntia spinosoir (Engelm.) Toumey – not accepted
  Quercus X subintegra (Engelm.) Trel. – accepted – oak
  Pinus ayacahuite var. reflexa (Engelm.) Voss – not accepted
  Pinus cembroides var. edulis (Engelm.) Voss – not accepted
  Echinocereus pentalophus ssp. procumbens (Engelm.) W. Blum & Mich. Lange – accepted
  Echinocereus coccineus ssp. paucispinus (Engelm.) W. Blum, Mich. Lange & Rutow – accepted
  Geranium caespitosum var. parryi (Engelm.) W.A. Weber – not accepted – Parry's geranium
  Grammica denticulata (Engelm.) W.A. Weber – not accepted
  Grammica indecora ssp. neuropetala (Engelm.) W.A. Weber – not accepted
  Grammica pentagona (Engelm.) W.A. Weber – not accepted
  Hippochaete hyemalis ssp. affinis (Engelm.) W.A. Weber – not accepted
  Mesynium aristatum (Engelm.) W.A. Weber – not accepted
  Mesynium puberulum (Engelm.) W.A. Weber – not accepted
  Tithymalus incisa (Engelm.) W.A. Weber – not accepted
  Tithymalus incisus (Engelm.) W.A. Weber – not accepted
  Oenothera berlandieri ssp. pinifolia (Engelm.) W.L. Wagner & Hoch – accepted – Berlandier's sundrops
  Oenothera suffulta (Engelm.) W.L. Wagner & Hoch – accepted – kisses
  Oenothera suffulta ssp. suffulta (Engelm.) W.L. Wagner & Hoch – accepted – kisses
  Coryphantha vivipara var. aggregata (Engelm.) W.T. Marshall – not accepted
  Coryphantha vivipara var. arizonica (Engelm.) W.T. Marshall – not accepted
  Coryphantha vivipara var. deserti (Engelm.) W.T. Marshall – not accepted
  Echinocereus triglochidiatus var. paucispinus (Engelm.) W.T. Marshall – not accepted
  Thelocactus unguispinus (Engelm.) W.T. Marshall – not accepted
  Phoradendron juniperinum ssp. libocedri (Engelm.) Wiens – not accepted
  Phoradendron tomentosum ssp. macrophyllum (Engelm.) Wiens – not accepted
  Cymanchum utahense (Engelm.) Woodson – not accepted
  Cynanchum utahense (Engelm.) Woodson – not accepted – Utah swallowwort, Utah astephanus, Utah swallow-wort
  Chamaesyce serrula (Engelm.) Wooton & Standl. – not accepted – saw-tooth sandmat, sawtooth sandmat
  Talinum angustissimum (Engelm.) Wooton & Standl. – not accepted
  Tithymalus luridus (Engelm.) Wooton & Standl. – not accepted
  Tithymalus mexicanus (Engelm.) Wooton & Standl. – not accepted
  Zygophyllidum exstipulatum (Engelm.) Wooton & Standl. – not accepted
  Cuscuta glabrior (Engelm.) Yunck. – accepted – bushclover dodder
  Cuscuta glabrior var. pubescens (Engelm.) Yunck. – not accepted
  Cuscuta pentagona var. pubescens (Engelm.) Yunck. – not accepted – field dodder, bushclover dodder
  Eustylis purpurea (Herb.) Engelm. & A. Gray – not accepted
  Mammillaria brandegeei (J.M. Coult.) Engelm. ex K. Brandegee – accepted
  Mammillaria brandegeei ssp. brandegeei (J.M. Coult.) Engelm. ex K. Brandegee – accepted
  Mammillaria gabbii (J.M. Coult.) Engelm. ex K. Brandegee – not accepted
  Echinocactus xeranthemoides (J.M. Coult.) Engelm. ex Rydb. – not accepted
  Echinodorus ranunculoides (L.) Engelm. – not accepted
  Juncus effusus var. conglomeratus (L.) Engelm. – not accepted – common rush
  Valerianella amarella (Lindh. ex Engelm.) Krok – accepted – hairyseed cornsalad, hairy cornsalad
  Yucca tortifolia Lindl. ex Engelm. – not accepted
  Yucca macrocarpa Merriam, non Engelm. – not accepted
  Cnidoscolus stimulosus (Michx.) Engelm. & A. Gray – not accepted – finger rot
  Dianthera humilis (Michx.) Engelm. & A. Gray – not accepted
  Echinocactus setispinus var. hamatus (Muehlenpf.) Engelm. – not accepted
  Stillingia angustifolia (Müll. Arg.) Engelm. ex S. Watson – not accepted
  Cuscuta cassytoides Nees ex Engelm. – accepted – African dodder
  Buchloe dactyloides (Nutt.) Engelm. – not accepted – buffalograss
  Echinodorus radicans (Nutt.) Engelm. – not accepted
  Echinodorus rostratus (Nutt.) Engelm. – not accepted
  Phoradendron flavescens var. villosum (Nutt.) Engelm. – not accepted
  Quercus macrocarpa var. depressa (Nutt.) Engelm. – not accepted – bur oak
  Physostegia intermedia (Nutt.) Engelm. & A. Gray – accepted – intermediate dragonhead, slender false dragonhead
  Arceuthobium americanum Nutt. ex Engelm. – accepted – lodgepole pine dwarf mistletoe, American dwarf mistletoe
  Helianthemum capitatum Nutt. ex Engelm. & A. Gray – not accepted
  Sida oregana Nutt. ex Engelm. & A. Gray – not accepted
  Phoradendron villosum (Nutt.) Nutt. ex Engelm. – accepted – Pacific mistletoe
  Phoradendron villosum ssp. villosum (Nutt.) Nutt. ex Engelm. – not accepted – Pacific mistletoe
  Cereus engelmannii Parry ex Engelm. – not accepted
  Echinocactus johnsonii Parry ex Engelm. – not accepted
  Picea engelmannii Parry ex Engelm. – accepted – Engelmann spruce, Columbian spruce, mountain spruce, silver spruce, white spruce, Engelmann's spruce
  Picea engelmannii var. engelmannii Parry ex Engelm. – accepted – Engelmann spruce
  Picea glauca var. engelmannii (Parry ex Engelm.) B. Boivin – not accepted
  Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose – not accepted
  Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter – not accepted
  Pediocactus johnsonii (Parry ex Engelm.) Halda – not accepted
  Neolloydia johnsonii (Parry ex Engelm.) L.D. Benson – not accepted
  Echinocereus engelmannii (Parry ex Engelm.) Lem. – accepted – Órgano-pequeño fresa, Engelmann's hedgehog cactus, strawberry cactus
  Echinocereus engelmannii ssp. engelmannii (Parry ex Engelm.) Lem. – not accepted
  Echinocereus engelmannii var. engelmannii (Parry ex Engelm.) Lem. – accepted – Engelmann's hedgehog cactus, Engelmann's cactus
  Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor – accepted – Johnson's fishhook cactus, Johnson's barrel cactus, pygmy barrel cactus
  Picea glauca ssp. engelmannii (Parry ex Engelm.) T.M.C. Taylor – not accepted
  Agave rigida var. sisalana (Perrine) Engelm. – not accepted
  Echinodorus Rich. & Engelm. ex A. Gray – accepted – burhead
  Croton californicus var. major S. Watson ex Engelm. – not accepted
  Yucca gloriosa var. recurvifolia (Salisb.) Engelm. – accepted – curve-leaf yucca
  Opuntia engelmannii Salm-Dyck ex Engelm. – accepted
  Opuntia engelmannii var. engelmannii Salm-Dyck ex Engelm. – accepted
  Crataegus brachyacantha Sarg. & Engelm. – accepted – blueberry hawthorn
  Echinocereus pectinatus (Scheidw.) Engelm. – accepted – Órgano-pequeño peine, rainbow cactus
  Echinocereus pectinatus ssp. pectinatus (Scheidw.) Engelm. – accepted
  Echinocereus pectinatus var. pectinatus (Scheidw.) Engelm. – not accepted – rainbow cactus
  Cuscuta rostrata Shuttlw. ex Engelm. & A. Gray – accepted – beaked dodder
  Polygonella polygama (Vent.) Engelm. & A. Gray – accepted – October flower
  Polygonella polygama var. polygama (Vent.) Engelm. & A. Gray – accepted – October flower
  Syngonium podophyllum var. albolineatum (W. Bull) Engelm. – not accepted
  Cuscuta potosina W. Schaffn. ex Engelm. – accepted – globe dodder
  Catalpa speciosa (Warder) Warder ex Engelm. – accepted – northern catalpa
   

A gray bar