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Taxon author: Engelm.

ITIS records citing taxon author "Engelm."
 
 Kingdom Animalia
  Calidris maritima belcheri Engelmoer & Roselaar, 1998 -- valid
  Hylarana bergeri (Günther in Engelmann, Fritzsche, Günther and Obst, 1986) -- invalid
  Limosa lapponica taymyrensis Engelmoer & Roselaar, 1998 -- valid
  Pelophylax bergeri (Günther in Engelmann, Fritzsche, Günther and Obst, 1986) -- valid
  Pluvialis squatarola tomkovichi Engelmoer & Roselaar, 1998 -- valid
  Rana bergeri Günther in Engelmann, Fritzsche, Günther and Obst, 1986 -- invalid
  Rana lessonae bergeri Günther in Engelmann, Fritzsche, Günther and Obst, 1986 -- invalid
 
 Kingdom Plantae
  Abies balsamea var. fallax (Engelm.) B. Boivin -- not accepted
  Abies subalpina Engelm. -- not accepted
  Acalypha gracilens ssp. monococca (Engelm. ex A. Gray) G.L. Webster -- not accepted
  Acalypha gracilens var. monococca Engelm. ex A. Gray -- not accepted
  Acalypha monococca (Engelm. ex A. Gray) Lill. W. Mill. & Gandhi -- accepted -- slender threeseed mercury
  Acalypha virginica var. monococca (Engelm. ex A. Gray) Müll. Arg. -- not accepted
  Acanthocereus (Engelm. ex A. Berger) Britton & Rose -- accepted -- triangle cactus
  Acerates auriculata Engelm. ex Torr. -- not accepted
  Agalinis spiciflora (Engelm.) Pennell -- not accepted
  Agaloma curtisii (Engelm.) Nieuwl. -- not accepted
  Agaloma polyphylla (Engelm. ex Holz.) Nieuwl. -- not accepted
  Agassizia suavis A. Gray & 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 glomeruliflora (Engelm.) A. Berger -- not accepted -- Chisos agave, Chisos Mountain century plant, Maguey del Bravo
  Agave maculata Engelm. ex Torr., non Regel -- not accepted
  Agave palmeri Engelm. -- accepted -- Maguey de tlalcoyote, Palmer agave, Palmer century plant, Palmer's century plant
  Agave parryi Engelm. -- accepted -- Mezcal yapavai, Parry agave, Parry's agave
  Agave parryi ssp. parryi Engelm. -- accepted -- Huachuca agave, Parry's agave, rough agave
  Agave parryi var. couesii (Engelm. ex Trel.) Kearney & Peebles -- not accepted
  Agave parryi var. parryi Engelm. -- not accepted -- Parry's agave
  Agave rigida var. sisalana (Perrine) Engelm. -- not accepted
  Agave schottii Engelm. -- accepted -- Maguey puercoespín, Schott agave, Schott's century plant
  Agave schottii var. schottii Engelm. -- accepted -- Schott agave, Schott's century plant
  Agave shawii Engelm. -- accepted -- coastal agave, Maguey primavera, Shaw's agave
  Agave shawii var. shawii Engelm. -- accepted -- coastal agave
  Agave tigrina (Engelm.) Cory -- not accepted
  Agave utahensis Engelm. -- accepted -- Utah agave
  Agave utahensis var. nevadensis Engelm. ex Greenm. & Roush -- accepted -- Nevada agave
  Agave utahensis var. utahensis Engelm. -- accepted -- Utah agave
  Agave X glomeruliflora (Engelm.) A. Berger -- accepted -- Chisos Mountain century plant
  Aklema xanti (Engelm. ex Boiss.) Millsp. -- not accepted
  Alsine obtusa (Engelm.) Rose -- not accepted
  Ammoselinum butleri (Engelm. ex S. Watson) J.M. Coult. & Rose -- accepted -- Butler's sandparsley
  Ancistrocactus brevihamatus (Engelm.) Britton & Rose -- not accepted
  Ancistrocactus uncinatus var. wrightii (Engelm.) L.D. Benson -- not accepted
  Anisophyllum geyeri (Engelm.) Klotzsch & Garcke -- not accepted
  Anisophyllum humistratum (Engelm. ex A. Gray) Klotzsch & Garcke -- not accepted
  Anisophyllum ovalifolium Engelm. ex Klotzsch -- not accepted
  Antirrhinum wislizeni (Engelm. ex A. Gray) Tidestr. -- not accepted
  Apinus albicaulis (Engelm.) Rydb. -- not accepted
  Arceuthobium abietinum Engelm. ex Munz -- not accepted -- fir dwarf mistletoe
  Arceuthobium americanum Nutt. ex Engelm. -- accepted -- American dwarf mistletoe, lodgepole pine dwarf mistletoe
  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 microcarpum (Engelm.) Hawksw. & Wiens -- not accepted -- western spruce dwarf mistletoe
  Arceuthobium occidentale Engelm. -- not accepted -- digger pine dwarf mistletoe, gray pine dwarf mistletoe
  Arceuthobium vaginatum ssp. cryptopodum (Engelm.) Hawksw. & Wiens -- accepted -- pineland dwarf mistletoe, ponderosa pine dwarf mistletoe
  Arceuthobium vaginatum var. cryptopodum (Engelm.) Cronquist -- not accepted
  Argythammia humilis (Engelm. & A. Gray) Müll. Arg. -- not accepted
  Argythamnia humilis (Engelm. & A. Gray) Müll. Arg. -- not accepted -- low silverbush, low wildmercury
  Argythamnia humilis var. humilis (Engelm. & A. Gray) Müll. Arg. -- not accepted -- low silverbush, low wildmercury
  Ariocarpus fissuratus (Engelm.) K. Schum. -- accepted -- Biznaga peyotillo, chautle livingrock
  Ariocarpus fissuratus var. fissuratus (Engelm.) K. Schum. -- not accepted
  Aristida basiramea Engelm. ex Vasey -- accepted -- forked three-awn, forked threeawn
  Aristida basiramea var. basiramea Engelm. ex Vasey -- 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
  Aristolochia longiflora Engelm. & A. Gray -- not accepted
  Asarina wislizeni (Engelm. ex A. Gray) Pennell -- not accepted
  Asclepias auriculata (Engelm. ex Torr.) Holz. -- not accepted
  Asclepias brachystephana Engelm. ex Torr. -- accepted -- bract milkweed, short-crowned milkweed, shortcrown milkweed
  Asclepias involucrata Engelm. ex Torr. -- accepted -- dwarf milkweed
  Asclepias sullivantii Engelm. ex A. Gray -- accepted -- prairie milkweed, Sullivant's milkweed
  Astephanus utahensis Engelm. -- not accepted
  Aster anomalus Engelm. ex Torr. & A. Gray -- not accepted -- manyray aster
  Aster vernalis Engelm. ex E.S. Burgess -- not accepted
  Astragalus lindheimeri Engelm. ex A. Gray -- accepted -- Lindheimer's milkvetch
  Atheropogon papillosus Engelm. -- not accepted
  Baptisia X sulphurea Engelm. (pro. sp.) -- accepted -- sulphur wild indigo
  Bergerocactus emoryi (Engelm.) Britton & Rose -- accepted -- golden snakecactus, Órgano aterciopelado
  Bergerocereus emoryi (Engelm.) Britton & Rose -- not accepted
  Bilderdykia cristata (Engelm. & A. Gray) Greene -- not accepted
  Bilderdykia scandens var. cristata (Engelm. & A. Gray) C.F. Reed -- not accepted
  Bouteloua pappilosa (Engelm.) Torr. -- not accepted
  Bouvardia glaberrima Engelm. -- not accepted
  Brazoria Engelm. & A. Gray -- accepted -- brazos-mint, brazosmint
  Brazoria scutellarioides Engelm. & A. Gray -- not accepted -- prairie brazosmint
  Brazoria truncata (Benth.) Engelm. & A. Gray -- accepted -- rattlesnake flower
  Brazoria truncata var. truncata (Benth.) Engelm. & A. Gray -- accepted -- rattlesnake flower
  Brickellia cylindracea A. Gray & Engelm. -- accepted -- gravelbar brickellbush
  Buchloe Engelm. -- not accepted -- buffalograss
  Buchloe dactyloides (Nutt.) Engelm. -- not accepted -- buffalograss
  Cactus robustispinus (A. Schott ex Engelm.) Kuntze -- not accepted
  Calamaria saccharata (Engelm.) Kuntze -- not accepted
  Calliandra herbacea Engelm. ex A. Gray -- not accepted
  Callitriche austinii Engelm. -- not accepted
  Callitriche deflexa var. austinii (Engelm.) Hegelm. -- 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
  Camassia angusta (Engelm. & A. Gray) Blank. -- accepted -- prairie camas
  Campanula scabrella Engelm. -- accepted -- rough bellflower
  Capnoides crystallinum (Engelm.) Kuntze -- not accepted
  Capnoides micranthum (Engelm. ex A. Gray) Britton -- not accepted
  Capnoides montanum (Engelm.) Britton -- not accepted
  Carnegia gigantea (Engelm.) Britton & Rose -- not accepted
  Carnegiea gigantea (Engelm.) Britton & Rose -- accepted -- Saguaro, saguaro
  Castilleja indivisa Engelm. -- accepted -- entireleaf Indian paintbrush, Texas paintbrush
  Catalpa speciosa (Warder) Warder ex Engelm. -- accepted -- northern catalpa
  Cathartolinum aristatum (Engelm.) Small -- not accepted
  Cathartolinum puberulum (Engelm.) Small -- not accepted
  Celtis lindheimeri Engelm. ex K. Koch -- accepted -- Lindheimer's hackberry, palo blanco
  Centaurium nudicaule (Engelm.) B.L. Rob. -- not accepted -- Santa Catalina centaurium, Santa Catalina Mountain centaury
  Cerastium brachypodum (Engelm. ex A. Gray) B.L. Rob. -- accepted -- bractpod chickweed, mouse-ear chickweed, short-stalk mouse-ear chickweed, shortstalk chickweed
  Cerastium nutans var. brachypodum Engelm. ex A. Gray -- not accepted
  Cereus emoryi Engelm. -- not accepted
  Cereus engelmannii Parry ex Engelm. -- not accepted
  Cereus enneacanthus (Engelm.) 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 nudiflorus Engelm. ex Sauvalle -- not accepted
  Cereus paucispinus Engelm. -- not accepted
  Cereus pectinatus var. rigidissimus Engelm. -- not accepted
  Cereus phoeniceus Engelm. -- not accepted
  Cereus phoeniceus var. pacificus Engelm. ex Orcutt -- not accepted
  Cereus schottii Engelm. -- not accepted
  Cereus stramineus Engelm. -- not accepted
  Cereus thurberi Engelm. -- not accepted
  Cereus viridiflorus var. cylindricus Engelm. -- not accepted
  Chaetopappa bellidifolia (A. Gray & Engelm.) Shinners -- accepted -- whiteray leastdaisy
  Chamaesyce angusta (Engelm.) Small -- not accepted -- blackfoot sandmat
  Chamaesyce arizonica (Engelm.) Arthur -- not accepted -- Arizona sandmat
  Chamaesyce astyla (Engelm. ex Boiss.) Millsp. -- not accepted -- alkali sandmat
  Chamaesyce blodgettii (Engelm. ex Hitchc.) Small -- not accepted -- limestone sandmat
  Chamaesyce capitellata (Engelm.) Millsp. -- not accepted -- head sandmat
  Chamaesyce cinerascens (Engelm.) Small -- not accepted -- ashy 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 exstipulata (Engelm.) Rydb. -- not accepted
  Chamaesyce flagelliformis (Engelm.) Rydb. -- not accepted
  Chamaesyce floribunda (Engelm. ex Boiss.) Millsp. -- not accepted
  Chamaesyce florida (Engelm.) Millsp. -- not accepted -- Chiricahua Mountain sandmat
  Chamaesyce fruticulosa (Engelm. ex Boiss.) Millsp. -- not accepted
  Chamaesyce garberi (Engelm. ex Chapm.) Small -- not accepted -- Garber's sandmat, Garber's spurge
  Chamaesyce geyeri (Engelm.) Small -- not accepted -- Geyer's sandmat, Geyer's spurge
  Chamaesyce geyeri var. geyeri (Engelm.) Small -- not accepted -- Geyer's sandmat
  Chamaesyce glyptosperma (Engelm.) Small -- not accepted -- rib-seed sandmat, ribseed sandmat, ridgeseed spurge
  Chamaesyce grisea (Engelm. ex Boiss.) Millsp. -- not accepted
  Chamaesyce hirtula (Engelm. ex S. Watson) Millsp. -- not accepted
  Chamaesyce humistrata (Engelm. ex A. Gray) Small -- not accepted -- spreading sandmat
  Chamaesyce indivisa (Engelm.) Millsp. -- not accepted
  Chamaesyce lata (Engelm.) Small -- not accepted -- hoary sandmat, hoary spurge
  Chamaesyce micromera (Boiss. ex Engelm.) Wooton & Standl. -- not accepted -- desert spurge, Sonoran sandmat
  Chamaesyce missurica var. petaloidea (Engelm.) Dorn -- not accepted
  Chamaesyce nuttallii (Engelm.) Small -- not accepted
  Chamaesyce ovalifolia (Engelm. ex Klotzsch) Croizat -- not accepted
  Chamaesyce parryi (Engelm.) Rydb. -- not accepted -- Parry's sandmat, Parry's spurge
  Chamaesyce pediculifera (Engelm.) Rose & Standl. -- not accepted -- Carrizo Mountain sandmat
  Chamaesyce petaloidea (Engelm.) Small -- not accepted
  Chamaesyce pilosula (Engelm. ex Boiss.) Arthur -- not accepted
  Chamaesyce platysperma (Engelm. ex S. Watson) Shinners -- not accepted -- flat-seed sandmat, flat-seeded spurge, flatseed sandmat
  Chamaesyce pycnanthema (Engelm.) Millsp. -- not accepted
  Chamaesyce radicans (Engelm. ex Boiss.) Millsp. -- not accepted
  Chamaesyce revoluta (Engelm.) Small -- not accepted -- thread-stem sandmat, threadstem sandmat, threadstem spurge
  Chamaesyce rugulosa (Engelm. ex Millsp.) Rydb. -- not accepted
  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
  Chamaesyce serrula (Engelm.) Wooton & Standl. -- not accepted -- saw-tooth sandmat, sawtooth sandmat
  Chamaesyce setiloba (Engelm. ex Torr.) Millsp. -- not accepted -- Yuma sandmat, Yuma spurge
  Chamaesyce setiloba (Engelm. ex Torr.) Norton -- not accepted
  Chamaesyce stictospora (Engelm.) Small -- not accepted -- slim-seed sandmat, slimseed sandmat, slimseed spurge
  Chamaesyce trachysperma (Engelm.) Millsp. -- not accepted -- San Pedro River sandmat
  Chamaesyce umbellulata (Engelm. ex Boiss.) Millsp. -- not accepted
  Chilopsis linearis var. glutinosa (Engelm.) Fosberg -- not accepted
  Chondrosum papillosum (Engelm.) Torr. -- not accepted
  Cirsium altissimum var. filipendulum (Engelm.) A. Gray -- not accepted
  Cirsium filipendulum Engelm. -- not accepted
  Clematis coccinea Engelm. -- not accepted
  Clistoyucca brevifolia (Engelm.) Rydb. -- not accepted
  Cnidoscolus stimulosus (Michx.) Engelm. & A. Gray -- not accepted -- finger rot
  Colubrina stricta Engelm. ex M.C. Johnst. -- accepted -- Comal nakedwood, Comal snakewood
  Corydalis aurea ssp. occidentalis (Engelm. ex A. Gray) G.B. Ownbey -- accepted -- curvepod fumewort, scrambled eggs
  Corydalis aurea var. micrantha Engelm. ex A. Gray -- not accepted
  Corydalis aurea var. occidentalis Engelm. ex A. Gray -- not accepted
  Corydalis crystallina Engelm. -- accepted -- mealy corydalis, mealy fumewort
  Corydalis curvisiliqua Engelm. -- accepted -- curvepod corydalis, curvepod fumewort
  Corydalis curvisiliqua ssp. curvisiliqua Engelm. -- accepted -- curvepod fumewort
  Corydalis curvisiliqua ssp. occidentalis (Engelm. ex A. Gray) W.A. Weber -- not accepted -- curvepod fumewort
  Corydalis micrantha (Engelm. ex A. Gray) A. Gray -- accepted -- smallflower corydalis, smallflower fumewort
  Corydalis micrantha ssp. micrantha (Engelm. ex A. Gray) A. Gray -- accepted -- smallflower fumewort
  Corydalis montana Engelm. -- not accepted
  Corynopuntia bulbispina (Engelm.) F.M. Knuth -- accepted
  Coryphantha (Engelm.) Lem. -- accepted -- beehive cactus
  Coryphantha aggregata (Engelm.) Britton & Rose -- not accepted
  Coryphantha arizonica (Engelm. ex Brew & Wats) Britton & Rose -- not accepted
  Coryphantha chlorantha (Engelm.) Britton & Rose -- not accepted
  Coryphantha compacta (Engelm.) Britton & Rose -- accepted
  Coryphantha cornifera var. echinus (Engelm.) L.D. Benson -- not accepted -- rhinoceros cactus
  Coryphantha dasyacantha (Engelm.) Orcutt -- not accepted
  Coryphantha dasyacantha var. dasyacantha (Engelm.) Orcutt -- not accepted
  Coryphantha deserti (Engelm.) Britton & Rose -- not accepted
  Coryphantha echinus (Engelm.) Britton & Rose -- not accepted -- Biznaga-partida erizo, rhinoceros cactus
  Coryphantha echinus (Engelm.) Orcutt -- accepted
  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
  Coryphantha missouriensis var. caespitosa (Engelm.) L.D. Benson -- not accepted
  Coryphantha missouriensis var. robustior (Engelm.) L.D. Benson -- not accepted
  Coryphantha muehlenpfordtii ssp. robustispina (A. Schott ex Engelm.) Dicht -- not accepted
  Coryphantha muehlenpfordtii var. robustispina (A. Schott ex Engelm.) W.T. Marshall -- not accepted
  Coryphantha neomexicana (Engelm.) Britton & Rose -- not accepted
  Coryphantha pectinata (Engelm.) Britton & Rose -- not accepted
  Coryphantha radiosa (Engelm.) Rydb. -- not accepted
  Coryphantha recurvata (Engelm.) Britton & Rose -- accepted -- Biznaga-partida de espinas curvas, Santa Cruz beehive cactus
  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 scheeri var. robustispina (A. Schott ex Engelm.) L.D. Benson -- not accepted -- longtubercle beehive cactus, Pima pineapple cactus
  Coryphantha scheeri var. valida (Engelm.) L.D. Benson -- not accepted -- pineapple cactus, Scheer's beehive cactus
  Coryphantha similis (Engelm.) Britton & Rose -- not accepted
  Coryphantha sulcata (Engelm.) Britton & Rose -- accepted -- finger cactus, pineapple cactus
  Coryphantha sulcata var. sulcata (Engelm.) Britton & Rose -- not accepted -- pineapple cactus
  Coryphantha tuberculosa (Engelm.) A. Berger -- not accepted
  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
  Coryphantha vivipara var. neomexicana (Engelm.) Backeb. -- not accepted
  Coryphantha vivipara var. radiosa (Engelm.) Backeb. -- not accepted
  Crataegus brachyacantha Sarg. & Engelm. -- accepted -- blueberry hawthorn
  Crataegus nitida (Engelm. ex Britton & A. Br.) Sarg. -- accepted -- glossy hawthorn
  Crataegus viridis var. nitida Engelm. ex Britton & A. Br. -- not accepted
  Croton californicus var. major S. Watson ex Engelm. -- not accepted
  Croton capitatus var. lindheimeri (Engelm. & A. Gray) Müll. Arg. -- not accepted -- Lindheimer's hogwort
  Croton corymbulosus Engelm. -- not accepted
  Croton lindheimeri (Engelm. & A. Gray) Alph. Wood -- accepted -- Lindheimer's hogwort
  Cuscuta applanata Engelm. -- accepted -- Gila River dodder
  Cuscuta arvensis Beyr. ex Engelm. -- not accepted
  Cuscuta californica var. apiculata Engelm. -- accepted -- chaparral dodder
  Cuscuta californica var. breviflora Engelm. -- not accepted -- California dodder, chaparral dodder, western dodder
  Cuscuta cassytoides Nees ex Engelm. -- accepted -- African dodder
  Cuscuta cephalanthi Engelm. -- accepted -- butterbush dodder, buttonbush dodder
  Cuscuta coryli Engelm. -- accepted -- hazel dodder
  Cuscuta corylii Engelm. -- not accepted
  Cuscuta curta (Engelm.) Rydb. -- not accepted
  Cuscuta cuspidata Engelm. -- accepted -- cusp dodder
  Cuscuta denticulata Engelm. -- accepted -- desert dodder, small-tooth dodder
  Cuscuta denticulata var. denticulata Engelm. -- accepted -- desert dodder, smalltooth dodder
  Cuscuta exaltata Engelm. -- accepted -- tall dodder
  Cuscuta glabrior (Engelm.) Yunck. -- accepted -- bushclover dodder
  Cuscuta glabrior var. pubescens (Engelm.) Yunck. -- not accepted
  Cuscuta glandulosa (Engelm.) Small -- not accepted
  Cuscuta gronovii var. calyptrata Engelm. -- accepted -- scaldweed
  Cuscuta gronovii var. curta Engelm. -- not accepted
  Cuscuta gronovii var. latiflora Engelm. -- not accepted
  Cuscuta gronovii var. saururi (Engelm.) MacMill. -- not accepted
  Cuscuta indecora var. neuropetala (Engelm.) Hitchc. -- not accepted -- bigseed alfalfa dodder, bigseed dodder
  Cuscuta leptantha Engelm. -- accepted -- slender dodder
  Cuscuta mitriformis Engelm. -- accepted -- Cochise dodder, joint dodder
  Cuscuta obtusiflora var. glandulosa Engelm. -- accepted -- Peruvian dodder
  Cuscuta odontolepis Engelm. -- accepted -- Santa Rita dodder, Santa Rita Mountain dodder
  Cuscuta pentagona Engelm. -- accepted -- bush-clover dodder, field dodder, fiveangled dodder, lespedeza dodder
  Cuscuta pentagona var. calycina Engelm. -- not accepted
  Cuscuta pentagona var. glabrior (Engelm.) Gandhi, R.D. Thomas & S.L. Hatch -- not accepted -- bushclover dodder, field dodder
  Cuscuta pentagona var. pentagona Engelm. -- not accepted -- bush-clover dodder, field dodder, fiveangle dodder, fiveangled dodder
  Cuscuta pentagona var. pubescens (Engelm.) Yunck. -- not accepted -- bushclover dodder, field dodder
  Cuscuta polygonorum Engelm. -- accepted -- smartweed dodder
  Cuscuta potosina W. Schaffn. ex Engelm. -- accepted -- globe dodder
  Cuscuta rostrata Shuttlw. ex Engelm. & A. Gray -- accepted -- beaked dodder
  Cuscuta salina Engelm. -- accepted -- goldenthread, saltmarsh dodder
  Cuscuta salina var. salina Engelm. -- accepted -- saltmarsh dodder
  Cuscuta squamata Engelm. -- accepted -- scaleflower dodder
  Cylindropuntia (Engelm.) F.M. Knuth -- accepted
  Cylindropuntia acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth -- accepted
  Cylindropuntia acanthocarpa ssp. acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth -- accepted
  Cylindropuntia acanthocarpa ssp. major (Engelm. & J.M. Bigelow) U. Guzmán -- 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 bigelovii var. ciribe (Engelm. ex J.M. Coult.) Rebman -- accepted
  Cylindropuntia ciribe (Engelm.) F.M. Knuth -- not accepted
  Cylindropuntia clavellina (Engelm. ex J.M. Coult.) F.M. Knuth -- not accepted
  Cylindropuntia davisii (Engelm. & J.M. Bigelow) F.M. Knuth -- accepted
  Cylindropuntia echinocarpa (Engelm. & J.M. Bigelow) F.M. Knuth -- accepted
  Cylindropuntia fulgida (Engelm.) F.M. Knuth -- accepted
  Cylindropuntia fulgida var. fulgida (Engelm.) F.M. Knuth -- accepted
  Cylindropuntia fulgida var. mamillata (A. Schott ex Engelm.) Backeb. -- 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 tesajo (Engelm. ex J.M. Coult.) F.M. Knuth -- accepted
  Cylindropuntia thurberi (Engelm.) F.M. Knuth -- accepted
  Cylindropuntia versicolor (Engelm. ex J.M. Coult.) F.M. Knuth -- accepted
  Cylindropuntia whipplei (Engelm. & J.M. Bigelow) F.M. Knuth -- accepted
  Cymanchum utahense (Engelm.) Woodson -- not accepted
  Cynanchum utahense (Engelm.) Woodson -- not accepted -- Utah astephanus, Utah swallow-wort, Utah swallowwort
  Cyperus refractus Engelm. ex Boeckeler -- accepted -- reflexed flatsedge
  Dasylirion leiophyllum Engelm. ex Trel. -- accepted -- green sotol, smooth sotol, Sotol brillante
  Daucosma Engelm. & A. Gray ex A. Gray -- accepted
  Daucosma laciniata Engelm. & A. Gray -- accepted -- meadow parasol
  Dendrocereus nudiflorus (Engelm. ex Sauvalle) Britton & Rose -- accepted
  Descurainia incana ssp. incisa (Engelm. ex A. Gray) Kartesz & Gandhi -- not accepted -- mountain tansy mustard, mountain tansymustard
  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
  Desmodium wislizeni Engelm. ex A. Gray -- not accepted
  Dianthera humilis (Michx.) Engelm. & A. Gray -- not accepted
  Dicentra ochroleuca Engelm. -- accepted -- yellow bleeding hearts, yellow bleedingheart
  Dichrophyllum bicolor (Engelm. & A. Gray) Klotzsch & Garcke -- not accepted
  Dimorphocarpa wislizeni (Engelm.) Rollins -- accepted -- spectacle pod, spectaclepod, touristplant, Wislizeni's spectaclepod
  Dimorphocarpa wislizenii (Engelm.) Rollins -- not accepted
  Dipteracanthus micranthus Engelm. & A. Gray -- not accepted
  Dipteracanthus nudiflorus Engelm. & A. Gray -- not accepted
  Distichlis littoralis (Engelm.) H.L. Bell & Columbus -- accepted
  Ditaxis humilis (Engelm. & A. Gray) Pax -- accepted -- low silverbush
  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 johnsonii Parry ex Engelm. -- not accepted
  Echinocactus lecontei Engelm. -- not accepted
  Echinocactus papyracanthus (Engelm.) Engelm. -- not accepted
  Echinocactus parryi Engelm. -- accepted
  Echinocactus polyancistrus Engelm. & J.M. Bigelow -- not accepted
  Echinocactus polycephalus Engelm. & J.M. Bigelow -- accepted -- Biznaga-tonel amacollada, cottontop barrel cactus, cottontop cactus
  Echinocactus polycephalus ssp. polycephalus Engelm. & J.M. Bigelow -- accepted
  Echinocactus polycephalus var. polycephalus Engelm. & J.M. Bigelow -- not accepted -- cottontop cactus
  Echinocactus pubispinus Engelm. -- not accepted
  Echinocactus setispinus Engelm. -- not accepted
  Echinocactus setispinus var. hamatus (Muehlenpf.) Engelm. -- not accepted
  Echinocactus sileri Engelm. ex J.M. Coult. -- not accepted
  Echinocactus simpsonii Engelm. -- not accepted
  Echinocactus uncinatus var. wrightii Engelm. -- not accepted
  Echinocactus unguispinus Engelm. -- not accepted
  Echinocactus whipplei Engelm. & J.M. Bigelow -- not accepted
  Echinocactus whipplei var. spinosior Engelm. -- not accepted
  Echinocactus wislizeni Engelm. -- not accepted
  Echinocactus xeranthemoides (J.M. Coult.) Engelm. ex Rydb. -- not accepted
  Echinocactus xeranthemoides Engelm. ex J.M. Coult. -- not accepted
  Echinocereus Engelm. -- accepted -- hedgehog cactus
  Echinocereus adustus Engelm. -- accepted
  Echinocereus adustus ssp. adustus Engelm. -- accepted
  Echinocereus berlandieri (Engelm.) J.N. Haage -- accepted -- Berlandier's hedgehog cactus, Órgano-pequeño de Berlandier
  Echinocereus caespitosus (Engelm.) Engelm. -- not accepted
  Echinocereus caespitosus var. minor (Engelm.) D. Weniger -- not accepted
  Echinocereus chloranthus (Engelm.) J.N. Haage -- not accepted -- brownspine hedgehog cactus, Órgano-pequeño de flor verde
  Echinocereus chloranthus var. chloranthus (Engelm.) J.N. Haage -- not accepted -- brownspine hedgehog cactus
  Echinocereus chloranthus var. cylindricus (Engelm.) N.P. Taylor -- not accepted -- brownspine hedgehog cactus
  Echinocereus coccineus Engelm. -- accepted -- Órgano-pequeño de espinas escarlatas, scarlet hedgehog cactus
  Echinocereus coccineus ssp. coccineus Engelm. -- accepted
  Echinocereus coccineus ssp. mojavensis (Engelm. & J.M. Bigelow) N.P. Taylor -- not accepted
  Echinocereus coccineus ssp. paucispinus (Engelm.) W. Blum, Mich. Lange & Rutow -- accepted
  Echinocereus coccineus var. coccineus Engelm. -- not accepted -- Bisbee cactus, scarlet hedgehog cactus
  Echinocereus coccineus var. conoideus (Engelm.) D. Weniger -- not accepted
  Echinocereus coccineus var. paucispinus (Engelm.) Ferguson -- not accepted -- scarlet hedgehog cactus
  Echinocereus ctenoides (Engelm.) Rümpler -- not accepted
  Echinocereus dasyacanthus Engelm. -- accepted -- Órgano-pequeño arcoiris de Texas, spiny hedgehog cactus
  Echinocereus dasyacanthus ssp. dasyacanthus Engelm. -- not accepted
  Echinocereus dubius (Engelm.) Engelm. ex Rümpler -- not accepted
  Echinocereus engelmannii (Parry ex Engelm.) Lem. -- accepted -- Engelmann's hedgehog cactus, Órgano-pequeño fresa, strawberry cactus
  Echinocereus engelmannii ssp. engelmannii (Parry ex Engelm.) Lem. -- not accepted
  Echinocereus engelmannii var. chrysocentrus (Engelm. & J.M. Bigelow) Rümpler -- accepted -- Engelmann's hedgehog cactus, Saint's hedgehog cactus, yellow-center hedgehog cactus
  Echinocereus engelmannii var. engelmannii (Parry ex Engelm.) Lem. -- accepted -- Engelmann's cactus, Engelmann's hedgehog cactus
  Echinocereus engelmannii var. variegatus (Engelm. & J.M. Bigelow) Rümpler -- accepted -- Engelmann's hedgehog cactus, varigated hedgehog cactus
  Echinocereus enneacanthus Engelm. -- accepted -- Órgano-pequeño alicoche real, pitaya, smallspine pitaya
  Echinocereus enneacanthus ssp. enneacanthus Engelm. -- accepted
  Echinocereus enneacanthus var. dubius (Engelm.) L.D. Benson -- not accepted
  Echinocereus enneacanthus var. enneacanthus Engelm. -- not accepted -- pitaya
  Echinocereus enneacanthus var. stramineus (Engelm.) L.D. Benson -- 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 (Engelm.) Sencke ex J.N. Haage -- accepted
  Echinocereus fendleri (Engelm.) Rümpler -- not accepted -- Fendler's hedgehog cactus, Órgano-pequeño de Nuevo México, pinkflower hedgehog cactus
  Echinocereus fendleri ssp. fendleri (Engelm.) Sencke ex J.N. Haage -- accepted
  Echinocereus fendleri var. fasciculatus (Engelm. ex B.D. Jacks.) N.P. Taylor -- not accepted -- pinkflower hedgehog cactus, strawberry cactus
  Echinocereus fendleri var. fendleri (Engelm.) Sencke ex J.N. Haage -- not accepted -- Fendler's hedgehog cactus, pinkflower hedgehog cactus
  Echinocereus hexaedrus (Engelm. & J.M. Bigelow) Rümpler -- not accepted
  Echinocereus longisetus (Engelm.) Rümpler -- accepted
  Echinocereus longisetus ssp. longisetus (Engelm.) Rümpler -- accepted
  Echinocereus mamillatus (Engelm. ex J.M. Coult.) Britton & Rose -- not accepted
  Echinocereus mojavensis (Engelm. & J.M. Bigelow) Rümpler -- not accepted
  Echinocereus pacificus (Engelm. ex Orcutt) Britton & Rose -- accepted
  Echinocereus pectinatus (Scheidw.) Engelm. -- accepted -- Órgano-pequeño peine, rainbow cactus
  Echinocereus pectinatus ssp. ctenoides (Engelm.) G. Frank -- accepted
  Echinocereus pectinatus ssp. pectinatus (Scheidw.) Engelm. -- accepted
  Echinocereus pectinatus var. ctenoides (Engelm.) D. Weniger -- not accepted
  Echinocereus pectinatus var. dasyacanthus (Engelm.) N.P. Taylor -- not accepted -- rainbow cactus
  Echinocereus pectinatus var. minor (Engelm.) L.D. Benson -- not accepted
  Echinocereus pectinatus var. pectinatus (Scheidw.) Engelm. -- not accepted -- rainbow cactus
  Echinocereus pectinatus var. rigidissimus (Engelm.) Rümpler -- not accepted
  Echinocereus pentalophus ssp. procumbens (Engelm.) W. Blum & Mich. Lange -- accepted
  Echinocereus phoeniceus (Engelm.) Rümpler -- not accepted
  Echinocereus phoeniceus var. phoeniceus (Engelm.) Rümpler -- not accepted
  Echinocereus polyacanthus Engelm. -- accepted -- Mojave mound cactus, Órgano-pequeño enmarañado
  Echinocereus polyacanthus ssp. pacificus (Engelm. ex Orcutt) Breckw. -- not accepted
  Echinocereus polyacanthus ssp. polyacanthus Engelm. -- not accepted
  Echinocereus polyacanthus var. pacificus (Engelm. ex Orcutt) N.P. Taylor -- not accepted
  Echinocereus rigidissimus (Engelm.) J.N. Haage -- accepted -- rainbow hedgehog cactus
  Echinocereus rigidissimus ssp. rigidissimus (Engelm.) J.N. Haage -- accepted
  Echinocereus stramineus (Engelm.) F. Seitz -- accepted -- Órgano-pequeño sanjuanero, strawberry hedgehog cactus
  Echinocereus stramineus ssp. stramineus (Engelm.) F. Seitz -- accepted
  Echinocereus triglochidiatus Engelm. -- accepted -- claretcup hedgehog, kingcup cactus, Mojave mound cactus, Órgano-pequeño copa de vino
  Echinocereus triglochidiatus ssp. mojavensis (Engelm. & J.M. Bigelow) W. Blum & Mich. Lange -- not accepted
  Echinocereus triglochidiatus ssp. triglochidiatus Engelm. -- not accepted
  Echinocereus triglochidiatus var. gonacanthus (Engelm. & J.M. Bigelow) Boissev. -- not accepted
  Echinocereus triglochidiatus var. hexaedrus (Engelm.) Boissev. & C. Davidson -- not accepted
  Echinocereus triglochidiatus var. melanacanthus (Engelm. ex A. Gray) L.D. Benson -- not accepted
  Echinocereus triglochidiatus var. mojavensis (Engelm. & J.M. Bigelow) L.D. Benson -- not accepted -- Mohave hedgehog cactus, Mojave kingcup cactus
  Echinocereus triglochidiatus var. paucispinus (Engelm.) W.T. Marshall -- not accepted
  Echinocereus triglochidiatus var. polyacanthus (Engelm.) L.D. Benson -- not accepted
  Echinocereus triglochidiatus var. triglochidiatus Engelm. -- not accepted -- kingcup cactus
  Echinocereus viridiflorus Engelm. -- accepted -- green pitaya, nylon hedgehog cactus
  Echinocereus viridiflorus ssp. chloranthus (Engelm.) N.P. Taylor -- accepted
  Echinocereus viridiflorus ssp. cylindricus (Engelm.) N.P. Taylor -- accepted -- nylon hedgehog cactus
  Echinocereus viridiflorus ssp. viridiflorus Engelm. -- accepted
  Echinocereus viridiflorus var. cylindricus (Engelm.) Rümpler -- not accepted -- nylon hedgehog cactus
  Echinocereus viridiflorus var. viridiflorus Engelm. -- not accepted -- nylon hedgehog cactus
  Echinocereus X roetteri (Engelm.) Rümpler -- accepted
  Echinodorus Rich. & Engelm. ex A. Gray -- accepted -- burhead
  Echinodorus berteroi var. lanceolatus (Engelm. ex S. Watson & J.M. Coult.) Fassett -- not accepted
  Echinodorus parvulus Engelm. -- not accepted -- mudbabies
  Echinodorus radicans (Nutt.) Engelm. -- not accepted
  Echinodorus ranunculoides (L.) Engelm. -- not accepted
  Echinodorus rostratus (Nutt.) Engelm. -- not accepted
  Echinodorus rostratus var. lanceolatus Engelm. ex S. Watson & J.M. Coult. -- not accepted
  Echinodorus tenellus var. parvulus (Engelm.) Fassett -- not accepted
  Echinomastus intertextus (Engelm.) Britton & Rose -- not accepted
  Echinomastus intertextus var. dasyacanthus (Engelm.) Backeb. -- not accepted
  Echinomastus intertextus var. intertextus (Engelm.) Britton & Rose -- not accepted
  Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter -- not accepted
  Echinomastus unguispinus (Engelm.) Britton & Rose -- not accepted
  Ehrendorferia ochroleuca (Engelm.) Fukuhara -- not accepted -- yellow bleeding heart
  Elodea minor (Engelm. ex Caspary) Farw. -- not accepted
  Emorycactus parryi (Engelm.) Doweld -- not accepted
  Emorycactus polycephalus (Engelm. & J.M. Bigelow) Doweld -- not accepted
  Ephedra aspera Engelm. ex S. Watson -- accepted -- aspera Mormon tea, boundary ephedra, Mormon tea, rough jointfir
  Ephedra nevadensis var. aspera (Engelm. ex S. Watson) L.D. Benson -- not accepted
  Ephedra pedunculata Engelm. ex S. Watson -- accepted -- vine ephedra, vine jointfir
  Epiphyllanthus obovatus (Engelm. ex K. Schum.) Britton & Rose -- not accepted
  Epithelantha greggii (Engelm.) Orcutt -- not accepted
  Epithelantha micromeris (Engelm.) A. Weber ex Britton & Rose -- accepted -- Biznaga-blanca chilona, pingpong ball cactus
  Epithelantha micromeris ssp. greggii (Engelm.) N.P. Taylor -- not accepted
  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
  Epixiphium (Engelm. ex A. Gray) Munz -- accepted
  Epixiphium wislizeni (Engelm. ex A. Gray) Munz -- accepted -- balloonbush
  Equisetum affine Engelm. -- not accepted
  Equisetum hyemale ssp. affine (Engelm.) Calder & Roy L. Taylor -- accepted -- prêle d'hiver, scouringrush horsetail
  Equisetum hyemale var. affine (Engelm.) A.A. Eaton -- not accepted -- scouringrush horsetail, stout scouringrush, tall scouring-rush
  Equisetum hyemale var. elatum (Engelm.) C.V. Morton -- not accepted
  Eriogonum alpinum Engelm. -- accepted -- Trinity buckwheat
  Eriogonum atrorubens Engelm. -- accepted -- buckwheat, red buckwheat
  Eriogonum atrorubens var. atrorubens Engelm. -- accepted -- red buckwheat
  Eriogonum longifolium var. plantagineum Engelm. & A. Gray -- not accepted
  Eriophorum viridicarinatum (Engelm.) Fernald -- accepted -- tassel cotton-grass, thinleaf cottonsedge
  Eryngium heterophyllum Engelm. -- accepted -- Wright's eryngo
  Escobaria chlorantha (Engelm.) Buxb. -- accepted
  Escobaria dasyacantha (Engelm.) Britton & Rose -- accepted -- Big Bend foxtail cactus, Biznaga-Escobar de espinas gruesas
  Escobaria dasyacantha ssp. dasyacantha (Engelm.) Britton & Rose -- accepted
  Escobaria dasyacantha var. dasyacantha (Engelm.) Britton & Rose -- not accepted -- Big Bend foxtail cactus
  Escobaria deserti (Engelm.) Buxb. -- 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 missouriensis var. similis (Engelm.) N.P. Taylor -- accepted -- Missouri foxtail cactus
  Escobaria neomexicana (Engelm.) Buxb. -- not accepted
  Escobaria tuberculosa (Engelm.) Britton & Rose -- accepted -- Biznaga-Escobar rómbica, white column foxtail cactus
  Escobaria vivipara var. arizonica (Engelm.) D.R. Hunt -- not accepted -- Arizona pincushion cactus, Arizona spinystar
  Escobaria vivipara var. deserti (Engelm.) D.R. Hunt -- not accepted -- desert spinystar
  Escobaria vivipara var. neomexicana (Engelm.) Buxb. -- not accepted -- New Mexico spinystar
  Escobaria vivipara var. radiosa (Engelm.) D.R. Hunt -- not accepted -- spinystar
  Eumecanthus bifurcatus (Engelm.) Millsp. -- not accepted
  Eupatorium cuneatum (Engelm. ex A. Gray) Engelm. ex Small -- not accepted
  Eupatorium perfoliatum var. cuneatum Engelm. ex A. Gray -- not accepted
  Euphorbia acuta Engelm. -- accepted -- Pointed sandmat
  Euphorbia adenoptera var. indivisa (Engelm.) Boiss. -- not accepted
  Euphorbia angusta Engelm. -- accepted -- Blackfoot sandmat, narrow-leaf spurge
  Euphorbia arenaria Engelm. & A. Gray -- not accepted
  Euphorbia arizonica Engelm. -- accepted -- Arizona sandmat
  Euphorbia arkansana Engelm. & A. Gray -- not accepted
  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 barbellata Engelm. -- not accepted
  Euphorbia baueri Engelm. ex Boiss. -- 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 bifurcata Engelm. -- accepted -- forked spurge
  Euphorbia bilobata Engelm. -- accepted -- black-seed spurge, blackseed spurge
  Euphorbia blodgettii Engelm. ex Hitchc. -- accepted -- limestone sandmat
  Euphorbia brachycera Engelm. -- accepted -- horned spurge, shorthorn spurge
  Euphorbia brachycera var. greggii (Engelm. ex Boiss.) M.C. Johnst. -- not accepted
  Euphorbia brachycera var. robusta (Engelm.) Dorn -- not accepted
  Euphorbia calliadena Engelm. ex Boiss. -- not accepted
  Euphorbia capitellata Engelm. -- accepted -- capitate sandmat, head sandmat, head spurge
  Euphorbia chamaesula var. subdentata (Engelm.) Norton -- not accepted
  Euphorbia cinerascens Engelm. -- accepted -- ashy sandmat
  Euphorbia cinerascens var. appendiculata Engelm. -- not accepted
  Euphorbia colorata Engelm. -- accepted
  Euphorbia commutata Engelm. ex A. Gray -- accepted -- tinted euphorbia, tinted woodland spurge
  Euphorbia consanguinea Engelm. ex Boiss. -- not accepted
  Euphorbia crenulata Engelm. -- accepted -- Chinese caps, Chinesecaps
  Euphorbia cuphosperma (Engelm.) Boiss. -- accepted -- hairy-fruit spurge, Hairy-fruited Spurge
  Euphorbia curtisii Engelm. -- accepted -- Curtis' spurge, sandhills spurge
  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 dentata f. cuphosperma (Engelm.) Fernald -- not accepted
  Euphorbia dentata var. cuphosperma Engelm. -- not accepted
  Euphorbia dentata var. linearis Engelm. ex Boiss. -- 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 -- Clark Mountain spurge, square-seed spurge, squareseed spurge
  Euphorbia exstipulata var. exstipulata Engelm. -- not accepted -- Clark Mountain spurge, squareseed spurge
  Euphorbia flagelliformis (Engelm.) Engelm. -- not accepted
  Euphorbia floribunda Engelm. ex Boiss. -- accepted
  Euphorbia florida Engelm. -- accepted -- Chiricahua Mountain sandmat
  Euphorbia fruticulosa Engelm. ex Boiss. -- accepted
  Euphorbia fruticulosa var. fruticulosa Engelm. ex Boiss. -- accepted
  Euphorbia garberi Engelm. ex Chapm. -- accepted -- Garber's sandmat, Garber's spurge
  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 -- ribseed sandmat, ridgeseed spurge
  Euphorbia glyptosperma var. tenerrima Engelm. -- not accepted
  Euphorbia greggii Engelm. ex Boiss. -- accepted
  Euphorbia grisea Engelm. ex Boiss. -- not accepted
  Euphorbia gymnoclada Engelm. -- not accepted
  Euphorbia heterophylla var. barbellata (Engelm.) Holz. -- not accepted
  Euphorbia heterophylla var. graminifolia Engelm. -- not accepted
  Euphorbia hirtula Engelm. ex S. Watson -- not accepted
  Euphorbia hortensis Engelm. ex Boiss. -- not accepted
  Euphorbia humistrata Engelm. ex A. Gray -- accepted -- spreading sandmat
  Euphorbia hypericifolia var. communis Engelm. -- not accepted
  Euphorbia incisa Engelm. -- not accepted -- Mojave spurge
  Euphorbia incisa var. incisa Engelm. -- not accepted -- Mojave spurge
  Euphorbia indivisa (Engelm.) Tidestr. -- accepted -- royal sandmat
  Euphorbia klotzschii var. schizosepala (Engelm. ex Boiss.) Oudejans -- not accepted
  Euphorbia lata Engelm. -- accepted -- broadleaf spurge, hoary sandmat
  Euphorbia leiococca (Engelm.) Norton -- not accepted
  Euphorbia leptocera Engelm. ex Torr. -- not accepted
  Euphorbia leptocera Engelm. ex Boiss. -- not accepted
  Euphorbia leptocera var. crenulata (Engelm.) Boiss. -- not accepted
  Euphorbia lindheimeriana Engelm. ex Boiss. -- not accepted
  Euphorbia lurida Engelm. -- accepted -- San Francisco Mountain spurge, woodland spurge
  Euphorbia maculata var. detonsa Engelm. ex Boiss. -- not accepted
  Euphorbia marginata var. uloleuca Engelm. & A. Gray -- not accepted
  Euphorbia melanadenia var. subinappendiculata Engelm. -- not accepted
  Euphorbia mexicana (Engelm.) Norton -- not accepted
  Euphorbia micromera Boiss. ex Engelm. -- accepted -- desert spurge, Sonoran sandmat, tiny sandmat
  Euphorbia missurica var. intermedia (Engelm.) L.C. Wheeler -- not accepted
  Euphorbia missurica var. petaloidea (Engelm.) Dorn -- 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 notata Engelm. ex Boiss. -- not accepted
  Euphorbia nuttallii (Engelm.) Small -- not accepted
  Euphorbia ovalifolia (Engelm. ex Klotzsch) Boiss. -- not accepted
  Euphorbia ovalifolia var. schizosepala Engelm. ex Boiss. -- 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 palmeri var. subpubens (Engelm. ex S. Watson) L.C. Wheeler -- not accepted -- woodland spurge
  Euphorbia parryi Engelm. -- accepted -- dune spurge, Parry's sandmat
  Euphorbia pediculifera Engelm. -- accepted -- Carrizo Mountain sandmat
  Euphorbia pediculifera var. pediculifera Engelm. -- accepted
  Euphorbia peplidion Engelm. -- accepted -- low spurge
  Euphorbia peplofolia Engelm. ex Patt. -- not accepted
  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 pilosula Engelm. ex Boiss. -- not accepted
  Euphorbia pilulifera var. discolor Engelm. -- not accepted
  Euphorbia platysperma Engelm. ex S. Watson -- accepted -- dune spurge, flat-seeded spurge, flatseed sandmat
  Euphorbia polycarpa var. appendiculata (Engelm.) Munz -- not accepted
  Euphorbia polyphylla Engelm. ex Holz. -- accepted -- Lesser Florida spurge
  Euphorbia prostrata var. vestita Engelm. ex Boiss. -- not accepted
  Euphorbia pycnanthema Engelm. -- not accepted
  Euphorbia revoluta Engelm. -- accepted -- threadstem sandmat, threadstem spurge
  Euphorbia robusta (Engelm.) Small -- not accepted -- robust spurge, Rocky Mountain spurge
  Euphorbia rugulosa (Engelm. ex Millsp.) Greene -- not accepted
  Euphorbia schizoloba Engelm. -- accepted -- Mojave spurge
  Euphorbia serpens var. indica Engelm. ex Boiss. -- not accepted
  Euphorbia serpens var. ovalifolia (Engelm. ex Klotzsch) Allem -- not accepted
  Euphorbia serpyllifolia ssp. hirtella (Engelm. ex S. Watson) Oudejans -- not accepted
  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
  Euphorbia serpyllifolia var. rugulosa Engelm. ex Millsp. -- not accepted
  Euphorbia serrula Engelm. -- accepted -- sawtooth sandmat
  Euphorbia setiloba Engelm. ex Torr. -- accepted -- fringed spurge, shaggy spurge, Yuma sandmat
  Euphorbia setiloba var. dentata Engelm. ex Boiss. -- not accepted
  Euphorbia spathulata var. mexicana (Engelm.) Oudejans -- not accepted
  Euphorbia stictospora Engelm. -- accepted -- mat spurge, narrow-seeded spurge, slimseed sandmat
  Euphorbia stictospora var. stictospora Engelm. -- accepted
  Euphorbia stipulacea Engelm. ex Boiss. -- not accepted
  Euphorbia subpubens Engelm. ex S. Watson -- not accepted
  Euphorbia subserrata Engelm. ex Boiss. -- not accepted
  Euphorbia tetrapora Engelm. -- accepted -- weak spurge
  Euphorbia tomentella Engelm. ex Boiss. -- accepted
  Euphorbia trachysperma Engelm. -- accepted -- San Pedro River sandmat
  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
  Euphorbia zygophylloides var. flagelliformis (Engelm.) Boiss. -- not accepted
  Eustylis Engelm. & A. Gray -- not accepted
  Eustylis purpurea (Herb.) Engelm. & A. Gray -- not accepted
  Eysenhardtia spinosa Engelm. -- accepted -- spiny kidneywood
  Fendlera Engelm. & A. Gray -- accepted -- fendlerbush
  Fendlera rupicola Engelm. & A. Gray -- accepted -- cliff fendlerbush, fendlerbush
  Ferocactus acanthodes var. lecontei (Engelm.) G.E. Linds. -- not accepted
  Ferocactus cylindraceus (Engelm.) Orcutt -- accepted -- Biznaga-barril cilíndrica, California barrel cactus
  Ferocactus cylindraceus ssp. cylindraceus (Engelm.) Orcutt -- accepted
  Ferocactus cylindraceus ssp. lecontei (Engelm.) N.P. Taylor -- accepted
  Ferocactus cylindraceus var. cylindraceus (Engelm.) Orcutt -- not accepted -- California barrel cactus, campus barrel cactus
  Ferocactus cylindraceus var. eastwoodiae (Engelm.) N.P. Taylor -- not accepted -- California barrel cactus, yellowspine barrel cactus
  Ferocactus cylindraceus var. lecontei (Engelm.) H. Bravo -- not accepted -- Leconte's barrel cactus, redspine barrel cactus
  Ferocactus emoryi (Engelm.) Orcutt -- accepted -- Biznaga-barril de Emory, Emory's barrel cactus
  Ferocactus emoryi ssp. emoryi (Engelm.) Orcutt -- accepted
  Ferocactus emoryi ssp. rectispinus (Engelm.) N.P. Taylor -- accepted
  Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose -- not accepted
  Ferocactus lecontei (Engelm.) Britton & Rose -- not accepted -- Biznaga-barril de Gila
  Ferocactus polyancistrus (Engelm. & J.M. Bigelow) N.P. Taylor -- not accepted
  Ferocactus pubispinus (Engelm.) N.P. Taylor -- not accepted
  Ferocactus setispinus (Engelm.) L.D. Benson -- not accepted
  Ferocactus spinosior (Engelm.) N.P. Taylor -- not accepted
  Ferocactus uncinatus var. wrightii (Engelm.) N.P. Taylor -- not accepted
  Ferocactus whipplei (Engelm. & J.M. Bigelow) N.P. Taylor -- not accepted
  Ferocactus wislizeni (Engelm.) Britton & Rose -- accepted -- Biznaga-barril de Nuevo México, candy barrel cactus, fishhook barrel cactus
  Ferocactus wislizenii (Engelm.) Britton & Rose -- not accepted
  Fouquieria splendens Engelm. -- accepted -- ocotillo
  Funastrum cynanchoides ssp. heterophyllum (Engelm. ex Torr.) Kartesz -- not accepted -- Hartweg's twinevine
  Funastrum heterophyllum (Engelm. ex Torr.) Standl. -- not accepted
  Funastrum utahense (Engelm.) Liede & Meve -- accepted -- Utah swallow-wort
  Gaillardia suavis (A. Gray & Engelm.) Britton & Rusby -- accepted -- perfumeballs, sweet gaillardia
  Galarhoeus arkansanus (Engelm. & A. Gray) Small ex Rydb. -- not accepted
  Galarhoeus commutatus (Engelm. ex A. Gray) Small ex Rydb. -- not accepted
  Galarhoeus robustus (Engelm.) Rydb. -- not accepted
  Gaura lindheimeri Engelm. & A. Gray -- not accepted -- Lindheimer's beeblossom, white gaura
  Gaura suffulta Engelm. -- not accepted -- kisses, roadside gaura
  Gaura suffulta ssp. suffulta Engelm. -- not accepted -- kisses
  Gentiana amarella ssp. heterosepala (Engelm.) J.M. Gillett -- not accepted
  Gentiana barbellata Engelm. -- not accepted
  Gentiana heterosepala Engelm. -- not accepted
  Gentiana oregana Engelm. ex A. Gray -- not accepted
  Gentiana parryi Engelm. -- accepted -- Parry's gentian
  Gentiana prostrata var. americana Engelm. -- not accepted
  Gentiana sceptrum var. humilis Engelm. ex A. Gray -- not accepted
  Gentiana wislizeni Engelm. -- not accepted
  Gentianella amarella ssp. heterosepala (Engelm.) J.M. Gillett -- accepted -- autumn dwarf gentian, dwarf gentian
  Gentianella amarella var. heterosepala (Engelm.) Dorn -- not accepted
  Gentianella barbellata (Engelm.) J.M. Gillett -- not accepted
  Gentianella heterosepala (Engelm.) Holub -- not accepted
  Gentianella wislizeni (Engelm.) J.M. Gillett -- accepted -- Chiricahua dwarf gentian, Chiricahua Mountain dwarf gentian
  Gentianella wislizenii (Engelm.) J.M. Gillett -- not accepted
  Gentianopsis barbellata (Engelm.) Iltis -- accepted -- perennial fringed gentian, perennial fringed-gentian
  Geranium caespitosum var. parryi (Engelm.) W.A. Weber -- not accepted -- Parry's geranium
  Geranium fremontii var. parryi Engelm. -- not accepted
  Geranium parryi (Engelm.) A. Heller -- not accepted
  Gerardia spiciflora Engelm. -- not accepted
  Glandulicactus uncinatus var. wrightii (Engelm.) Backeb. -- not accepted
  Glandulicactus wrightii (Engelm.) D.J. Ferguson -- not accepted
  Gonolobus cynanchoides Engelm. & A. Gray -- not accepted
  Gonolobus reticulatus Engelm. ex A. Gray -- not accepted
  Grammica cephalanthi (Engelm.) Hadac & Chrtek -- not accepted
  Grammica coryli (Engelm.) Hadac & Chrtek -- not accepted
  Grammica cuspidata (Engelm.) Hadac & Chrtek -- not accepted
  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
  Grammica salina (Engelm.) Roy L. Taylor & MacBryde -- not accepted
  Grusonia bulbispina (Engelm.) H. Rob. -- not accepted
  Grusonia clavata (Engelm.) H. Rob. -- accepted
  Grusonia emoryi (Engelm.) Pinkava -- accepted
  Grusonia grahamii (Engelm.) H. Rob. -- accepted
  Grusonia pulchella (Engelm.) H. Rob. -- accepted
  Grusonia schottii (Engelm.) H. Rob. -- accepted
  Guaiacum angustifolium Engelm. -- accepted -- Texas lignum-vitae
  Guajacum angustifolium Engelm. -- not accepted -- guayacan, Texas lignum-vitae
  Helianthemum capitatum Nutt. ex Engelm. & A. Gray -- not accepted
  Helianthium parvulum (Engelm.) Small -- not accepted
  Helianthus debilis ssp. praecox (Engelm. & A. Gray) Heiser -- not accepted
  Helianthus praecox Engelm. & A. Gray -- accepted -- Texas sunflower
  Helianthus praecox ssp. praecox Engelm. & A. Gray -- accepted -- Texas sunflower
  Hesperaloe Engelm. -- accepted -- false yucca, falseyucca
  Hesperhodos minutifolius (Engelm.) Hurst -- not accepted
  Hesperoyucca (Engelm.) Baker -- accepted
  Heuchera sanguinea Engelm. -- accepted -- coralbells
  Heuchera sanguinea var. sanguinea Engelm. -- not accepted -- coralbells
  Hippochaete hyemalis ssp. affinis (Engelm.) W.A. Weber -- not accepted
  Hypericum gymnanthum Engelm. & A. Gray -- accepted -- claspingleaf St. Johnswort
  Hypoxis hirsuta var. leptocarpa (Engelm. & A. Gray) Brackett -- not accepted
  Hypoxis leptocarpa (Engelm. & A. Gray) Small -- not accepted
  Ibidium vernale (Engelm. & A. Gray) House -- not accepted
  Isoetes bolanderi Engelm. -- accepted -- Bolander's quillwort
  Isoetes bolanderi var. bolanderi Engelm. -- not accepted -- Bolander's quillwort
  Isoetes bolanderi var. pygmaea (Engelm.) Clute -- not accepted -- pygmy quillwort
  Isoetes butleri Engelm. -- accepted -- Butler's quillwort, limestone quillwort
  Isoetes canadensis (Engelm.) A.A. Eaton -- not accepted
  Isoetes echinospora var. braunii (Durieu) Engelm. -- not accepted
  Isoetes echinospora var. muricata (Durieu) Engelm. -- not accepted
  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 ssp. paupercula (Engelm.) Feilberg -- not accepted
  Isoetes lacustris var. paupercula Engelm. -- not accepted
  Isoetes melanospora Engelm. -- accepted -- black-spored quillwort, blackspore quillwort
  Isoetes nuttallii A. Braun ex Engelm. -- accepted -- Nuttall's quillwort
  Isoetes nuttallii var. nuttallii A. Braun ex Engelm. -- not accepted -- Nuttall's quillwort
  Isoetes paupercula (Engelm.) A.A. Eaton -- not accepted
  Isoetes pygmaea Engelm. -- not accepted
  Isoetes riparia Engelm. ex A. Braun -- accepted -- isoète riparien, shore quillwort
  Isoetes riparia var. canadensis Engelm. -- not accepted
  Isoetes riparia var. riparia Engelm. ex A. Braun -- not accepted -- shore quillwort
  Isoetes saccharata Engelm. -- not accepted -- sugar quillwort
  Isoetes valida (Engelm.) Clute -- not accepted -- strong quillwort
  Jatropha macrorhiza var. septemfida Engelm. -- not accepted -- ragged jatropha, ragged nettlespurge
  Juglans rupestris Engelm. ex Torr. -- not accepted
  Juncus acuminatus var. robustus Engelm. -- not accepted
  Juncus acutus var. sphaerocarpus Engelm. -- not accepted
  Juncus arcticus ssp. littoralis (Engelm.) Hultén -- not accepted -- mountain rush
  Juncus arcticus var. littoralis (Engelm.) B. Boivin -- not accepted
  Juncus arcticus var. montanus (Engelm.) S.L. Welsh -- not accepted
  Juncus arcticus var. sitchensis Engelm. -- not accepted
  Juncus articulatus var. obtusatus Engelm. -- not accepted
  Juncus balticus ssp. littoralis (Engelm.) Snogerup -- accepted -- Baltic rush
  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 brachycephalus (Engelm.) Buchenau -- accepted -- small-head rush, smallhead rush
  Juncus brachystylus (Engelm.) Piper -- not accepted
  Juncus brevicaudatus (Engelm.) Fernald -- accepted -- narrow-panicle rush, narrowpanicle 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 effusus var. conglomeratus (L.) Engelm. -- not accepted -- common rush
  Juncus ensifolius var. montanus (Engelm.) C.L. Hitchc. -- not accepted -- Rocky Mountain rush
  Juncus greenei var. vaseyi (Engelm.) B. Boivin -- not accepted
  Juncus hallii Engelm. -- accepted -- Hall rush, Hall's rush
  Juncus kelloggii Engelm. -- accepted -- Kellogg's dwarf rush, Kellogg's rush
  Juncus mertensianus ssp. gracilis (Engelm.) F.J. Herm. -- not accepted
  Juncus obtusatus Engelm., non Kit. -- not accepted
  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 robustus (Engelm.) Coville -- not accepted
  Juncus rugulosis Engelm. -- not accepted
  Juncus rugulosus Engelm. -- not accepted -- wrinkled rush
  Juncus subcaudatus (Engelm.) Coville & S.F. Blake -- accepted -- woodland rush
  Juncus subcaudatus var. subcaudatus (Engelm.) Coville & S.F. Blake -- not accepted -- woodland rush
  Juncus supiniformis Engelm. -- accepted -- hairyleaf rush
  Juncus tenuis var. congestus Engelm. -- not accepted
  Juncus texanus (Engelm.) Coville -- accepted -- Texas rush
  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 monosperma (Engelm.) Sarg. -- accepted -- enebro de sombra, oneseed juniper
  Juniperus occidentalis var. conjungens Engelm. -- not accepted
  Juniperus occidentalis var. utahensis (Engelm.) Kent -- not accepted
  Juniperus utahensis (Engelm.) Lemmon -- not accepted
  Keerlia bellidifolia A. Gray & Engelm. -- not accepted
  Lacinaria acidota (Engelm. & A. Gray) Kuntze -- not accepted
  Larrea glutinosa Engelm. -- not accepted
  Lemaireocereus thurberi (Engelm.) Britton & Rose -- not accepted
  Lepadena bicolor (Engelm. & A. Gray) Nieuwl. -- not accepted
  Lepidocoryphantha macromeris (Engelm.) Backeb. -- not accepted
  Lespedeza leptostachya Engelm. -- accepted -- prairie bush-clover, prairie lespedeza
  Lesquerella auriculata (Engelm. & A. Gray) S. Watson -- not accepted -- earleaf bladderpod
  Lesquerella recurvata (Engelm. ex A. Gray) S. Watson -- not accepted -- gaslight bladderpod
  Lewisia brachycalyx Engelm. ex A. Gray -- accepted -- short-sepal bitter-root, shortsepal bitterroot, shortsepal lewisia
  Liatris acidota Engelm. & A. Gray -- accepted -- sharp blazing star, sharp gayfeather
  Limnosciadium pumilum (Engelm. & A. Gray) Mathias & Constance -- accepted -- prairie dogshade
  Lindheimera A. Gray & Engelm. -- accepted -- lindheimera
  Lindheimera texana A. Gray & Engelm. -- accepted -- Texas star, Texas yellowstar
  Linum aristatum Engelm. -- accepted -- bristle flax
  Linum greggii Engelm. -- not accepted
  Linum puberulum (Engelm.) A. Heller -- accepted -- desert flax, plains flax
  Linum rigidum var. puberulum Engelm. -- not accepted
  Linum rupestre (A. Gray) Engelm. ex A. Gray -- accepted -- rock flax
  Lobelia cardinalis ssp. graminea var. phyllostachya (Engelm.) McVaugh -- not accepted -- cardinalflower
  Lobelia cardinalis var. phyllostachya (Engelm.) McVaugh -- not accepted
  Lophocereus (Engelm.) Britton & Rose -- not accepted
  Lophocereus schottii (Engelm.) Britton & Rose -- not accepted -- Senita
  Lophotocarpus calycinus (Engelm.) J.G. Sm. -- not accepted
  Lophotocarpus spongiosus (Engelm.) J.G. Sm. -- not accepted
  Ludwigia linearis var. puberula Engelm. & A. Gray -- not accepted
  Lythrum ovalifolium Engelm. ex Koehne -- accepted -- low loosestrife
  Machaerocereus gummosus (Engelm.) Britton & Rose -- not accepted
  Mammillaria aggregata Engelm. -- not accepted
  Mammillaria applanata Engelm. -- not accepted
  Mammillaria arizonica Engelm. -- not accepted
  Mammillaria barbata Engelm. -- accepted
  Mammillaria brandegeei (J.M. Coult.) Engelm. ex K. Brandegee -- accepted
  Mammillaria brandegeei ssp. brandegeei (J.M. Coult.) Engelm. ex K. Brandegee -- accepted
  Mammillaria compacta Engelm. -- not accepted
  Mammillaria dasyacantha Engelm. -- not accepted
  Mammillaria deserti Engelm. -- not accepted
  Mammillaria echinus Engelm. -- not accepted
  Mammillaria fasciculata Engelm. ex B.D. Jacks. -- not accepted
  Mammillaria fasciculata Engelm. -- not accepted
  Mammillaria fissurata Engelm. -- not accepted
  Mammillaria gabbii (J.M. Coult.) Engelm. ex K. Brandegee -- not accepted
  Mammillaria gabbii Engelm. ex J.M. Coult. -- not accepted
  Mammillaria grahamii Engelm. -- accepted -- Graham's nipple cactus, Graham's pincushion 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 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 hemisphaerica Engelm. -- not accepted
  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 heyderi var. applanata (Engelm.) Engelm. -- not accepted
  Mammillaria heyderi var. gummifera (Engelm.) L.D. Benson -- not accepted
  Mammillaria heyderi var. hemisphaerica (Engelm.) Engelm. -- not accepted -- little nipple cactus
  Mammillaria heyderi var. meiacantha (Engelm.) L.D. Benson -- not accepted -- little nipple cactus
  Mammillaria lasiacantha Engelm. -- accepted -- Biznaga de espinas pubescentes, lacespine nipple cactus, small pincushion 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 microcarpa ssp. grahamii (Engelm.) Mottram -- not accepted
  Mammillaria micromeris Engelm. -- not accepted
  Mammillaria micromeris var. greggii Engelm. -- not accepted
  Mammillaria milleri var. grahamii (Engelm.) Neutel. -- not accepted
  Mammillaria neomexicana (Engelm.) A. Nelson -- not accepted
  Mammillaria papyracantha Engelm. -- not accepted
  Mammillaria prolifera ssp. texana (Engelm.) D.R. Hunt -- accepted
  Mammillaria prolifera var. texana (Engelm.) Borg -- not accepted -- Texas nipple cactus
  Mammillaria recurvata Engelm. -- not accepted
  Mammillaria robustispina A. Schott ex Engelm. -- not accepted
  Mammillaria setispina Engelm. ex J.M. Coult. -- not accepted
  Mammillaria similis Engelm. -- not accepted
  Mammillaria similis var. robustior Engelm. -- not accepted
  Mammillaria sulcata Engelm. -- not accepted
  Mammillaria tetrancistra Engelm. -- accepted -- Biznaga de cuatro ganchos, common fishhook cactus, corkseed pincushion cactus
  Mammillaria tuberculosa Engelm. -- not accepted
  Mammillaria vivipara var. arizonica (Engelm.) L.D. Benson -- not accepted
  Mammillaria vivipara var. borealis Engelm. -- not accepted
  Mammillaria vivipara var. deserti (Engelm.) D. Weniger -- not accepted
  Mammillaria vivipara var. neomexicana (Engelm.) Engelm. -- not accepted
  Mammillaria vivipara var. radiosa Engelm. -- not accepted
  Mammillaria wrightii Engelm. -- accepted -- Biznaga de Wright, Wright's nipple cactus, Wright's pincushion cactus
  Mammillaria wrightii ssp. wrightii Engelm. -- accepted
  Mammillaria wrightii var. wrightii Engelm. -- not accepted -- Wright's nipple cactus
  Manfreda tigrina (Engelm.) Small -- not accepted
  Manfreda virginica var. tigrina (Engelm.) Rose -- not accepted
  Marshallocereus thurberi (Engelm.) Backeb. -- not accepted
  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 -- hairy pepperwort, hairy waterclover, pepperwort
  Martynia arenaria Engelm. -- not accepted
  Matelea cynanchoides (Engelm. & A. Gray) Woodson -- accepted -- prairie milkvine
  Matelea reticulata (Engelm. ex A. Gray) Woodson -- accepted -- netted milkvine
  Maurandya wislizeni Engelm. ex A. Gray -- not accepted
  Maurandya wislizenii Engelm. ex A. Gray -- not accepted
  Meibomia wrightii (Engelm. ex A. Gray) Kuntze -- not accepted
  Melothria pendula var. chlorocarpa (Engelm.) Cogn. -- not accepted
  Menodora scoparia Engelm. ex A. Gray -- not accepted
  Mentzelia chrysantha Engelm. ex Brandegee -- accepted -- gold blazingstar
  Mesynium aristatum (Engelm.) W.A. Weber -- not accepted
  Mesynium puberulum (Engelm.) W.A. Weber -- not accepted
  Mimulus reniformis Engelm. ex Benth. -- not accepted
  Monanthochloe Engelm. -- not accepted -- monanthochloe, shoregrass
  Monanthochloe littoralis Engelm. -- not accepted -- shoregrass
  Monarda lindheimeri Engelm. & A. Gray ex A. Gray -- accepted -- Lindheimer's beebalm
  Myosotis macrosperma Engelm. -- accepted -- largeseed forget-me-not, southern forget-me-not
  Myosotis verna var. macrosperma (Engelm.) Chapm. -- not accepted
  Myosotis virginica var. macrosperma (Engelm.) Fernald -- not accepted
  Najas gracillima (A. Braun ex Engelm.) Magnus -- accepted -- slender waternymph
  Najas indica var. gracillima A. Braun ex Engelm. -- not accepted
  Nasturtium calycinum Engelm. ex Hayden -- not accepted
  Nemexia ecirrata (Engelm. ex Kunth) Small -- not accepted
  Nemexia ecirrhata (Engelm. ex Kunth) Small -- not accepted
  Neobesseya similis (Engelm. & A. Gray) Britton & Rose -- not accepted
  Neolloydia intertexta (Engelm.) L.D. Benson -- not accepted
  Neolloydia intertexta var. dasyacantha (Engelm.) L.D. Benson -- not accepted
  Neolloydia johnsonii (Parry ex Engelm.) L.D. Benson -- not accepted
  Neolloydia unguispina (Engelm.) L.D. Benson -- not accepted
  Neomammillaria similis (Engelm.) Britton & Rose ex Rydb. -- not accepted
  Nuphar lutea ssp. polysepala (Engelm.) E.O. Beal -- not accepted -- Rocky Mountain cowlily, Rocky Mountain pond-lily, Rocky Mountain pondlily, yellow pond-lily
  Nuphar luteum var. polysepalum (Engelm.) E.O. Beal -- not accepted
  Nuphar luteum var. variegatum (Engelm. ex. Clinton) E.O. Beal -- not accepted
  Nuphar polysepala Engelm. -- accepted -- Rocky Mountain pond-lily
  Nuttallia chrysantha (Engelm. ex Brandegee) Greene -- not accepted
  Nymphaea polysepala (Engelm.) Greene -- not accepted
  Nymphozanthus polysepalus (Engelm.) Fernald -- not accepted
  Oenothera berlandieri ssp. pinifolia (Engelm.) W.L. Wagner & Hoch -- accepted -- Berlandier's sundrops
  Oenothera lindheimeri (Engelm. & A. Gray) W.L. Wagner & Hoch -- accepted -- Lindheimer's beeblossom
  Oenothera pallida ssp. runcinata (Engelm.) Munz & W.M. Klein -- accepted -- pale evening primrose, pale evening-primrose, pale eveningprimrose
  Oenothera pallida var. runcinata (Engelm.) Cronquist -- not accepted
  Oenothera runcinata (Engelm.) Munz -- not accepted
  Oenothera runcinata var. brevifolia (Engelm.) Munz -- not accepted
  Oenothera serrulata ssp. pinifolia (Engelm. ex A. Gray) Munz -- not accepted
  Oenothera suffulta (Engelm.) W.L. Wagner & Hoch -- accepted -- kisses
  Oenothera suffulta ssp. suffulta (Engelm.) W.L. Wagner & Hoch -- accepted -- kisses
  Opuntia acanthocarpa Engelm. & J.M. Bigelow -- not accepted -- buckhorn cholla, Cholla espinosa
  Opuntia acanthocarpa ssp. acanthocarpa Engelm. & J.M. Bigelow -- not accepted
  Opuntia acanthocarpa var. acanthocarpa Engelm. & J.M. Bigelow -- not accepted -- buckhorn cholla
  Opuntia acanthocarpa var. major (Engelm. & J.M. Bigelow) L.D. Benson -- not accepted -- buckhorn cholla, slender joint buckhorn cholla
  Opuntia arborescens Engelm. -- not accepted
  Opuntia arbuscula Engelm. -- not accepted -- Arizona pencil cholla, Cholla arbusto, pencil cholla
  Opuntia arenaria Engelm. -- not accepted -- El Paso pricklypear, sand prickly-pear, sand pricklypear
  Opuntia basilaris Engelm. & J.M. Bigelow -- accepted -- beavertail pricklypear, Nopal del castor
  Opuntia basilaris var. basilaris Engelm. & J.M. Bigelow -- accepted -- beavertail pricklypear
  Opuntia bigelovii Engelm. -- not accepted -- Cholla velas de Coyote, teddybear cholla
  Opuntia bigelovii var. bigelovii Engelm. -- not accepted -- teddybear cholla
  Opuntia brachyarthra Engelm. & J.M. Bigelow -- not accepted
  Opuntia bulbispina Engelm. -- not accepted
  Opuntia californica Engelm. -- not accepted
  Opuntia camanchica Engelm. & J.M. Bigelow -- not accepted
  Opuntia chlorotica Engelm. & J.M. Bigelow -- accepted -- dollarjoint pricklypear, Nopal verdoso, pancake pricklypear
  Opuntia chlorotica var. chlorotica Engelm. & J.M. Bigelow -- not accepted
  Opuntia ciribe Engelm. ex J.M. Coult. -- not accepted
  Opuntia clavata Engelm. -- not accepted -- club cholla
  Opuntia compressa var. fuscoatra (Engelm.) D. Weniger -- not accepted
  Opuntia compressa var. grandiflora (Engelm.) D. Weniger -- not accepted
  Opuntia compressa var. macrorhiza (Engelm.) L.D. Benson -- not accepted
  Opuntia compressa var. microsperma (Engelm.) L.D. Benson -- not accepted
  Opuntia compressa var. stenochila (Engelm. & J.M. Bigelow) D. Weniger -- not accepted
  Opuntia cymochila Engelm. & J.M. Bigelow -- not accepted -- grassland pricklypear
  Opuntia davisii Engelm. & J.M. Bigelow -- not accepted
  Opuntia dulcis Engelm. -- not accepted
  Opuntia echinocarpa Engelm. & J.M. Bigelow -- not accepted -- Cholla plateada, golden cholla, silver cholla
  Opuntia echinocarpa var. echinocarpa Engelm. & J.M. Bigelow -- not accepted -- staghorn cholla
  Opuntia echinocarpa var. major Engelm. & J.M. Bigelow -- not accepted
  Opuntia echinocarpa var. parkeri (Engelm.) J.M. Coult. -- not accepted
  Opuntia emoryi Engelm. -- not accepted
  Opuntia emoryi auct. non Engelm. -- not accepted
  Opuntia engelmannii Salm-Dyck ex Engelm. -- accepted
  Opuntia engelmannii var. cycloides Engelm. & J.M. Bigelow -- not accepted
  Opuntia engelmannii var. dulcis (Engelm.) Engelm. ex K. Schum. -- not accepted
  Opuntia engelmannii var. engelmannii Salm-Dyck ex Engelm. -- accepted
  Opuntia engelmannii var. lindheimeri (Engelm.) B.D. Parfitt & Pinkava -- accepted -- Texas pricklypear
  Opuntia engelmannii var. littoralis Engelm. -- 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 erinacea var. hystricina (Engelm. & J.M. Bigelow) L.D. Benson -- not accepted -- grizzlybear pricklypear, porcupine pricklypear
  Opuntia erinacea var. utahensis (Engelm.) L.D. Benson -- not accepted -- Utah grizzlybear pricklypear, Utah pricklypear
  Opuntia fragilis ssp. brachyarthra (Engelm. & J.M. Bigelow) W.A. Weber -- not accepted
  Opuntia fragilis var. brachyarthra (Engelm. & J.M. Bigelow) J.M. Coult. -- not accepted -- Brach pricklypear cactus, brittle pricklypear
  Opuntia fulgida Engelm. -- not accepted -- Cholla brillante, jumping cholla
  Opuntia fulgida var. fulgida Engelm. -- not accepted -- jumping cholla
  Opuntia fulgida var. mamillata (A. Schott ex Engelm.) J.M. Coult. -- not accepted -- compact jumping cholla, jumping cholla
  Opuntia grahami Engelm. -- not accepted
  Opuntia grahamii Engelm. -- not accepted -- Cholla de Graham, devil cholla, Graham's pricklypear
  Opuntia grandiflora Engelm. -- not accepted
  Opuntia hystricina Engelm. & J.M. Bigelow -- not accepted -- Nopal puerco espín
  Opuntia imbricata var. arborescens (Engelm.) A.D. Zimmerman -- not accepted
  Opuntia lindheimeri Engelm. -- not accepted -- Nopal arrastrado
  Opuntia littoralis (Engelm.) Cockerell -- accepted -- coastal pricklypear, Nopal del litoral
  Opuntia littoralis var. littoralis (Engelm.) Cockerell -- accepted -- coastal pricklypear
  Opuntia macrocentra Engelm. -- accepted -- Nopal violaceo, purple pricklypear
  Opuntia macrocentra var. macrocentra Engelm. -- accepted -- longspine pricklypear, purple pricklypear, redjoint pricklypear
  Opuntia macrorhiza Engelm. -- accepted -- grassland pricklypear, Nopal raizudo, plains twistspine pricklypear, twistspine pricklypear
  Opuntia macrorhiza var. macrorhiza Engelm. -- not accepted -- bigflower pricklypear, twistspine pricklypear
  Opuntia mamillata A. Schott ex Engelm. -- not accepted -- Nopal de mamilas
  Opuntia microcarpa Engelm. -- not accepted -- smallfruit cactus
  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 occidentalis var. littoralis (Engelm.) Parish -- not accepted
  Opuntia parryi Engelm. -- not accepted -- brownspined pricklypear, Cholla de California
  Opuntia parryi var. parryi Engelm. -- not accepted -- brownspined pricklypear
  Opuntia parryi var. serpentina (Engelm.) L.D. Benson -- not accepted -- serpentine cholla, snake cholla
  Opuntia phaeacantha Engelm. -- accepted -- brownspine pricklypear, Nopal pardo, tulip pricklypear
  Opuntia phaeacantha var. brunnea (Engelm.) Engelm. -- not accepted
  Opuntia phaeacantha var. camanchica (Engelm. & J.M. Bigelow) L.D. Benson -- accepted -- brownspine pricklypear, tulip pricklypear
  Opuntia phaeacantha var. major Engelm. -- accepted -- great pricklypear, Mojave pricklypear
  Opuntia phaeacantha var. mojavensis (Engelm. & J.M. Bigelow) Fosberg -- not accepted
  Opuntia phaeacantha var. nigricans (Engelm.) Engelm. -- not accepted
  Opuntia phaeacantha var. phaeacantha Engelm. -- accepted -- tulip pricklypear
  Opuntia phaeacantha var. tenuispina (Engelm.) D. Weniger -- not accepted
  Opuntia polyacantha var. arenaria (Engelm.) B.D. Parfitt -- 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
  Opuntia polyacantha var. rufispina (Engelm. & J.M. Bigelow ex Engelm.) L.D. Benson -- accepted -- hairspine pricklypear, plains pricklypear, red-spine pricklypear
  Opuntia polyacantha var. trichophora (Engelm. & J.M. Bigelow) J.M. Coult. -- not accepted -- hairspine pricklypear, threadspine pricklypear
  Opuntia prolifera Engelm. -- not accepted -- Cholla prolifera, coastal cholla
  Opuntia pulchella Engelm. -- not accepted -- sagebrush cholla, sand cholla, sand club cholla
  Opuntia pycnantha Engelm. ex J.M. Coult. -- accepted
  Opuntia rafinesquei Engelm. -- not accepted
  Opuntia ramosissima Engelm. -- not accepted -- branched pencil cholla, Cholla diamante, diamond cholla, pencil cholla
  Opuntia rubrifolia Engelm. ex J.M. Coult. -- not accepted
  Opuntia rufida Engelm. -- accepted -- blind pricklypear, Nopal rojizo
  Opuntia schottii Engelm. -- not accepted -- Cholla abrojo de Texas, dog cactus, dog cholla
  Opuntia schottii var. grahamii (Engelm.) L.D. Benson -- not accepted
  Opuntia serpentina Engelm. -- not accepted -- Cholla serpentina
  Opuntia sphaerocarpa Engelm. & J.M. Bigelow -- not accepted
  Opuntia sphaerocarpa var. utahensis Engelm. -- not accepted
  Opuntia spinosior (Engelm.) Toumey -- not accepted -- cane cholla, Cholla tasajillo de Arizona, walkingstick cactus
  Opuntia spinosoir (Engelm.) Toumey -- 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 tapona Engelm. ex J.M. Coult. -- not accepted
  Opuntia tenuispina Engelm. -- not accepted
  Opuntia tesajo Engelm. ex J.M. Coult. -- not accepted
  Opuntia thurberi Engelm. -- not accepted
  Opuntia tortispina Engelm. & J.M. Bigelow -- accepted
  Opuntia trichophora (Engelm. & J.M. Bigelow) Britton & Rose -- not accepted -- Nopal peludito
  Opuntia tunicata var. davisii (Engelm. & J.M. Bigelow) L.D. Benson -- not accepted -- Jeff Davis cholla, thistle cholla
  Opuntia vaginata Engelm. -- 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
  Opuntia violacea Engelm. -- not accepted
  Opuntia violacea var. macrocentra (Engelm.) L.D. Benson -- not accepted
  Opuntia whipplei Engelm. & J.M. Bigelow -- not accepted -- Whipple's cholla
  Opuntia whipplei var. spinosior Engelm. -- not accepted
  Opuntia whipplei var. whipplei Engelm. & J.M. Bigelow -- not accepted -- Whipple cholla
  Opuntia X occidentalis Engelm. & J.M. Bigelow (pro sp.) -- accepted -- pricklypear
  Pachycereus calvus (Engelm. ex J.M. Coult.) Britton & Rose -- not accepted
  Pachycereus pecten-aboriginum (Engelm. ex S. Watson) Britton & Rose -- accepted
  Pachycereus schottii (Engelm.) D.R. Hunt -- accepted -- senita cactus
  Pachycereus thurberi (Engelm.) Bravo -- not accepted
  Panicum capillare var. minimum Engelm. ex Gatt. -- not accepted
  Panicum minimum (Engelm. ex Gatt.) Scribn. & Merr. -- 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
  Paspalum floridanum var. glabratum Engelm. ex Vasey -- accepted
  Paspalum glabratum (Engelm. ex Vasey) C. Mohr -- not accepted
  Passiflora affinis Engelm. -- accepted -- bracted passionflower
  Passiflora tenuiloba Engelm. -- accepted -- birdwing passionflower
  Paysonia auriculata (Engelm. & A. Gray) O'Kane & Al-Shehbaz -- accepted -- earleaf bladderpod
  Pediocactus brevihamatus (Engelm.) Halda -- not accepted
  Pediocactus intertextus (Engelm.) Halda -- not accepted
  Pediocactus johnsonii (Parry ex Engelm.) Halda -- not accepted
  Pediocactus papyracanthus (Engelm.) L.D. Benson -- not accepted -- paper-spined cactus
  Pediocactus polyancistrus (Engelm. & J.M. Bigelow) Arp -- not accepted
  Pediocactus sileri (Engelm. ex J.M. Coult.) L.D. Benson -- accepted -- Siler's pincushion cactus
  Pediocactus simpsonii (Engelm.) Britton & Rose -- accepted -- Simpson's hedgehog cactus, snowball pediocactus
  Pediocactus simpsonii ssp. bensonii (Engelm.) Hochstätter -- not accepted
  Pediocactus simpsonii ssp. simpsonii (Engelm.) Britton & Rose -- not accepted
  Pediocactus simpsonii var. minor (Engelm.) Cockerell -- not accepted -- snowball cactus
  Pediocactus simpsonii var. simpsonii (Engelm.) Britton & Rose -- not accepted -- Simpson hedgehog cactus, Simpson's hedgehog cactus
  Pediocactus spinosior (Engelm.) Halda -- not accepted
  Pediocactus unguispinus (Engelm.) Halda -- not accepted
  Pediocactus whipplei (Engelm. & J.M. Bigelow) Arp -- not accepted
  Peniocereus greggii (Engelm.) Britton & Rose -- accepted -- nightblooming cereus
  Peniocereus greggii var. greggii (Engelm.) Britton & Rose -- accepted -- Gregg's nightblooming cereus
  Peniocereus greggii var. transmontanus (Engelm.) Backeb. -- accepted -- nightblooming cereus
  Phacelia patuliflora (Engelm. & A. Gray) A. Gray -- accepted -- sand phacelia, sand scorpionweed
  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
  Phelipaea erianthera Engelm. ex A. Gray -- not accepted
  Phellosperma tetrancistra (Engelm.) Britton & Rose -- not accepted
  Phemeranthus aurantiacus (Engelm.) Kiger -- accepted -- orange fameflower
  Phemeranthus calycinus (Engelm.) Kiger -- accepted -- largeflower fameflower
  Philibertia heterophylla (Engelm. ex Torr.) Jeps. -- not accepted
  Philotria minor (Engelm. ex Caspary) Small -- not accepted
  Phoradendron flavescens var. macrophyllum Engelm. -- not accepted
  Phoradendron flavescens var. orbiculatum (Engelm.) Engelm. -- not accepted
  Phoradendron flavescens var. pubescens Engelm. ex A. Gray -- not accepted
  Phoradendron flavescens var. villosum (Nutt.) Engelm. -- not accepted
  Phoradendron juniperinum ssp. libocedri (Engelm.) Wiens -- not accepted
  Phoradendron juniperinum var. libocedri Engelm. -- not accepted
  Phoradendron libocedri (Engelm.) Howell -- not accepted -- incense cedar mistletoe
  Phoradendron macrophyllum (Engelm.) Cockerell -- not accepted -- Colorado Desert mistletoe
  Phoradendron macrophyllum ssp. macrophyllum (Engelm.) Cockerell -- not accepted -- Colorado Desert mistletoe
  Phoradendron serotinum ssp. macrophyllum (Engelm.) Kuijt -- accepted -- Colorado Desert mistletoe
  Phoradendron serotinum var. pubescens (Engelm. ex A. Gray) M.C. Johnst. -- not accepted
  Phoradendron tomentosum (DC.) Engelm. ex A. Gray -- not accepted -- bigleaf mistletoe, Christmas mistletoe, downy mistletoe
  Phoradendron tomentosum ssp. macrophyllum (Engelm.) Wiens -- not accepted
  Phoradendron tomentosum var. macrophyllum (Engelm.) L.D. Benson -- not accepted
  Phoradendron tomentosum var. tomentosum (DC.) Engelm. ex 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
  Physaria recurvata (Engelm. ex A. Gray) O'Kane & Al-Shehbaz -- accepted -- gaslight bladderpod
  Physostegia intermedia (Nutt.) Engelm. & A. Gray -- accepted -- intermediate dragonhead, slender false dragonhead
  Picea engelmannii Parry ex Engelm. -- accepted -- Columbian spruce, Engelmann spruce, Engelmann's spruce, mountain spruce, silver spruce, white spruce
  Picea engelmannii var. engelmannii Parry ex Engelm. -- accepted -- Engelmann spruce
  Picea glauca ssp. engelmannii (Parry ex Engelm.) T.M.C. Taylor -- not accepted
  Picea glauca var. engelmannii (Parry ex Engelm.) B. Boivin -- not accepted
  Picea pungens Engelm. -- accepted -- blue spruce, Colorado blue spruce, silver 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 -- Arizona pine, pino de Arizona
  Pinus arizonica var. arizonica Engelm. -- accepted -- Arizona pine
  Pinus ayacahuite var. reflexa (Engelm.) Voss -- not accepted
  Pinus ayacahuite var. strobiformis (Engelm.) Lemmon -- not accepted
  Pinus balfouriana var. aristata (Engelm.) Engelm. -- not accepted
  Pinus brachyptera Engelm. -- not accepted
  Pinus cembroides var. edulis (Engelm.) Voss -- not accepted
  Pinus chihuahuana Engelm. -- not accepted -- pino de Chihuahua
  Pinus clausa (Chapm. ex Engelm.) Vasey ex Sarg. -- accepted -- sand pine, scrub pine, spruce pine
  Pinus contorta ssp. latifolia (Engelm. ex S. Watson) Critchfield -- not accepted -- black pine, Rocky Mountain lodgepole pine
  Pinus contorta var. latifolia Engelm. ex S. Watson -- accepted -- lodgepole pine, Rocky Mountain lodgepole pine, tall lodgepole pine
  Pinus contorta var. murrayana (Balf.) Engelm. -- accepted -- Murray's lodgepole pine, Sierra lodgepole pine, tamarack pine
  Pinus divaricata var. latifolia (Engelm. ex S. Watson) B. Boivin -- not accepted
  Pinus edulis Engelm. -- accepted -- Colorado pinyon, nut pine, piñón de Colorado, piñon pine, pinyon, pinyon pine, two-leaf pinyon, two-needle pinyon, twoneedle pinyon
  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 greggii Engelm. ex Parl. -- accepted
  Pinus inops var. clausa Chapm. ex Engelm. -- not accepted
  Pinus leiophylla var. chihuahuana (Engelm.) Shaw -- accepted -- Chihuahuan pine, pino real, yellow pine
  Pinus ponderosa ssp. arizonica (Engelm.) A.E. Murray -- not accepted
  Pinus ponderosa ssp. jeffreyi (Balf.) Engelm. -- not accepted
  Pinus ponderosa ssp. scopulorum (Engelm.) A.E. Murray -- not accepted -- Black Hills pondersosa pine, Rocky Mountain ponderosa pine
  Pinus ponderosa var. arizonica (Engelm.) Shaw -- not accepted
  Pinus ponderosa var. brachyptera (Engelm.) Lemmon -- accepted -- ponderosa pine
  Pinus ponderosa var. scopulorum Engelm. -- accepted -- Black Hills ponderosa pine, interior pondersosa pine, ponderosa pine, Rocky Mountain ponderosa pine
  Pinus reflexa (Engelm.) Engelm. -- not accepted
  Pinus scopulorum (Engelm.) Lemmon -- not accepted
  Pinus strobiformis Engelm. -- accepted -- border limber pine, border white pine, Mexican white pine, southwestern white pine
  Plantago pusilla var. major Engelm. -- not accepted
  Platyopuntia (Engelm.) Fric & Schelle ex Kreuz. -- not accepted
  Pneumonanthe parryi (Engelm.) Greene -- not accepted
  Poinsettia barbellata (Engelm.) Small -- not accepted
  Poinsettia colorata (Engelm.) Dressler -- not accepted
  Poinsettia cuphosperma (Engelm.) Small -- not accepted
  Poinsettia dentata var. cuphosperma (Engelm.) Mohlenbr. -- not accepted
  Poinsettia graminifolia (Engelm.) Millsp. -- not accepted
  Polygonella polygama (Vent.) Engelm. & A. Gray -- accepted -- October flower
  Polygonella polygama var. polygama (Vent.) Engelm. & A. Gray -- accepted -- October flower
  Polygonum cristatum Engelm. & A. Gray -- not accepted
  Polygonum douglasii var. latifolium (Engelm.) Greene -- not accepted
  Polygonum douglasii var. microspermum (Engelm.) Dorn -- not accepted
  Polygonum microspermum (Engelm.) Small -- not accepted
  Polygonum scandens var. cristatum (Engelm. & A. Gray) Gleason -- not accepted -- climbing false buckwheat, false buckwheat
  Polygonum tenue var. microspermum Engelm. -- not accepted
  Porlieria angustifolia (Engelm.) A. Gray -- not accepted
  Portulaca lanceolata Engelm. -- not accepted
  Portulaca retusa Engelm. -- not accepted
  Portulaca suffrutescens Engelm. -- accepted -- shrubby purslane
  Portulaca umbraticola ssp. lanceolata (Engelm.) J.F. Matthews & Ketron -- accepted -- wingpod purslane
  Potentilla millegrana Engelm. ex Lehm. -- not accepted
  Potentilla pentandra Engelm. ex Torr. & A. Gray -- not accepted
  Potentilla rivalis var. millegrana (Engelm. ex Lehm.) S. Watson -- not accepted -- brook cinquefoil
  Potentilla rivalis var. pentandra (Engelm. ex Torr. & A. Gray) S. Watson -- not accepted -- brook cinquefoil, cinquefoil
  Proboscidea arenaria (Engelm.) Decne. -- not accepted
  Prunus gracilis Engelm. & A. Gray -- accepted -- Oklahoma plum
  Prunus minutiflora Engelm. ex A. Gray -- accepted -- smallflower peachbrush, Texas almond
  Quercus agrifolia var. frutescens Engelm. -- not accepted -- coastal live oak
  Quercus breweri Engelm. -- not accepted
  Quercus chrysolepis var. palmeri (Engelm.) Sarg. -- not accepted
  Quercus chrysolepis var. palneri (Engelm.) Sarg. -- not accepted
  Quercus falcata var. subintegra Engelm. -- not accepted
  Quercus garryana var. breweri (Engelm.) Jeps. -- accepted -- Oregon white oak
  Quercus garryana var. fruticosa (Engelm.) Govaerts -- not accepted -- Oregon white oak
  Quercus macrocarpa var. depressa (Nutt.) Engelm. -- not accepted -- bur oak
  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 live oak, island oak
  Quercus wislizeni var. frutescens Engelm. -- not accepted -- interior live oak
  Quercus wislizenii var. frutescens Engelm. -- not accepted
  Quercus X runcinata (A. DC.) Engelm. -- accepted -- oak
  Quercus X subintegra (Engelm.) Trel. -- accepted -- oak
  Quercus X tridentata (Engelm. ex A. DC.) Trel. (pro sp.) -- accepted -- tridentata oak
  Ranunculus laxicaulis var. angustifolia (Engelm.) L.D. Benson -- not accepted
  Ranunculus laxicaulis var. angustifolius (Engelm.) L.D. Benson -- not accepted
  Ranunculus lindheimeri Engelm. -- not accepted
  Ranunculus pusillus var. angustifolius (Engelm.) L.D. Benson -- not accepted -- low spearwort
  Ranunculus pusillus var. lindheimeri (Engelm.) A. Gray -- not accepted
  Ranunculus pusillus var. trachyspermus Engelm. -- not accepted
  Ranunculus texensis Engelm. & A. Gray -- not accepted
  Reynoutria scandens var. cristata (Engelm. & A. Gray) Shinners -- not accepted
  Rhus microphylla Engelm. ex A. Gray -- accepted -- littleleaf sumac
  Rorippa calycina (Engelm.) Rydb. -- accepted -- persistent sepal yellowcress, persistent-sepal yellowcress
  Rosa minutifolia Engelm. -- accepted -- Baja rose, small-leaved rose
  Roseocactus fissuratus (Engelm.) A. Berger -- not accepted
  Rudbeckia fulgida var. missouriensis (Engelm. ex C.L. Boynt. & Beadle) Cronquist -- not accepted
  Rudbeckia missouriensis Engelm. ex C.L. Boynt. & Beadle -- accepted -- Missouri coneflower, Missouri orange coneflower
  Ruellia nudiflora (Engelm. & A. Gray) Urb. -- accepted -- violet wild petunia, wild petunia
  Ruellia nudiflora var. nudiflora (Engelm. & A. Gray) Urb. -- accepted -- violet wild petunia
  Ruellia strepens var. micrantha (Engelm. & A. Gray) Britton -- not accepted
  Sabina monosperma (Engelm.) Rydb. -- not accepted
  Sabina utahensis (Engelm.) Rydb. -- not accepted
  Sagittaria calycina Engelm. -- not accepted -- hooded arrowhead
  Sagittaria calycina var. calycina Engelm. -- not accepted -- hooded arrowhead
  Sagittaria calycina var. spongiosa Engelm. -- not accepted -- hooded arrowhead, sagittaire à grand calice variété spongieuse, spongy arrow-head
  Sagittaria cristata Engelm. -- accepted -- crested arrowhead
  Sagittaria graminea var. cristata (Engelm.) Bogin -- not accepted
  Sagittaria graminea var. platyphylla Engelm. -- not accepted
  Sagittaria longiloba Engelm. ex J.G. Sm. -- accepted -- long-barb arrowhead, longbarb arrowhead, longlobe arrowhead
  Sagittaria montevidensis ssp. calycina (Engelm.) Bogin -- accepted -- hooded arrowhead
  Sagittaria montevidensis ssp. spongiosa (Engelm.) Bogin -- accepted -- hooded arrowhead, tidal arrowhead
  Sagittaria montevidensis var. spongiosa (Engelm.) B. Boivin -- not accepted
  Sagittaria platyphylla (Engelm.) J.G. Sm. -- accepted -- delta arrowhead
  Sagittaria spongiosus (Engelm.) -- not accepted
  Sagittaria variabilis var. obtusa Engelm. -- not accepted
  Saxifraga debilis Engelm. ex A. Gray -- accepted -- weak saxifrage
  Saxifraga hyperborea ssp. debilis (Engelm. ex A. Gray) Á. Löve & D. Löve & B.M. Kapoor -- not accepted
  Saxifraga rivularis var. debilis (Engelm. ex A. Gray) Dorn -- not accepted
  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
  Sclerocactus intertextus (Engelm.) N.P. Taylor -- accepted -- Biznaga-bola entretejida, white fish-hook cactus, white fishhook cactus
  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 johnsonii (Parry ex Engelm.) N.P. Taylor -- accepted -- Johnson's barrel cactus, Johnson's fishhook cactus, pygmy barrel cactus
  Sclerocactus papyracanthus (Engelm.) N.P. Taylor -- accepted -- Biznaga-bola de espinas de papel, paperspine fishhook cactus
  Sclerocactus polyancistrus (Engelm. & J.M. Bigelow) Britton & Rose -- accepted -- Mohave fishhook cactus, Mojave fishhook cactus, redspined fishhook cactus
  Sclerocactus pubispinus (Engelm.) L.D. Benson -- accepted -- Great Basin fishhook cactus
  Sclerocactus pubispinus var. pubispinus (Engelm.) L.D. Benson -- not accepted
  Sclerocactus pubispinus var. spinosior (Engelm.) S.L. Welsh -- not accepted
  Sclerocactus spinosior (Engelm.) D. Woodruff & L.D. Benson -- accepted -- desert valley fish-hook cactus, desert valley fishhook cactus
  Sclerocactus spinosior ssp. spinosior (Engelm.) D. Woodruff & L.D. Benson -- not accepted
  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
  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. spinosior (Engelm.) Boissev. -- not accepted
  Sclerocactus whipplei var. whipplei (Engelm. & J.M. Bigelow) Britton & Rose -- not accepted -- Whipple's fishhook cactus
  Scutellaria cardiophylla Engelm. & A. Gray -- accepted -- gulf skullcap
  Sida lindheimeri Engelm. & A. Gray -- accepted -- showy fanpetals
  Silene antirrhina var. laevigata Engelm. & A. Gray -- not accepted
  Silene antirrhina var. subglaber Engelm. & A. Gray -- not accepted
  Simsia calva (Engelm. & A. Gray) A. Gray -- accepted -- awnless bushsunflower
  Sisymbrium incisum Engelm. ex A. Gray -- not accepted
  Sisyrinchium minus Engelm. & A. Gray -- accepted -- dwarf blue-eyed grass, dwarf blueeyed grass
  Smilax ecirrata (Engelm. ex Kunth) S. Watson -- not accepted -- greenbriar, upright carrion-flower, upright carrionflower
  Smilax ecirrhata (Engelm. ex Kunth) S. Watson -- accepted -- upright carrionflower
  Solidago microphylla (A. Gray) Engelm. ex Small -- not accepted
  Sophia incisa (Engelm. ex A. Gray) Greene -- not accepted
  Sparganium androcladum (Engelm.) Morong -- accepted -- branched bur-reed, branched burreed, branching bur-reed
  Sparganium androcladum var. fluctuans Engelm. ex Morong -- not accepted
  Sparganium eurycarpum Engelm. -- accepted -- broad-fruit burr-reed, broadfruit bur-reed, broadfruit burreed, giant burreed
  Sparganium fluctuans (Engelm. ex Morong) B.L. Rob. -- accepted -- floating bur-reed
  Spartina densiflora var. junciformis (Engelm. & A. Gray) St.-Yves -- not accepted
  Spartina junciformis Engelm. & A. Gray -- not accepted
  Spiranthes vernalis Engelm. & A. Gray -- accepted -- spring ladies'-tresses, spring lady's tresses, upland ladiestresses
  Stellaria obtusa Engelm. -- accepted -- Rocky Mountain chickweed
  Stenocereus gummosus (Engelm.) A.C. Gibson & K.E. Horak -- accepted
  Stenocereus thurberi (Engelm.) Buxb. -- accepted -- organpipe cactus, Pitayo dulce
  Stenocereus thurberi ssp. thurberi (Engelm.) Buxb. -- accepted
  Stillingia angustifolia (Müll. Arg.) Engelm. ex S. Watson -- not accepted
  Styrax platanifolia Engelm. -- not accepted -- sycamoreleaf snowbell
  Styrax platanifolius Engelm. ex Torr. -- accepted -- sycamoreleaf snowbell
  Styrax platanifolius ssp. platanifolius Engelm. ex Torr. -- accepted -- sycamoreleaf snowbell
  Symphyotrichum anomalum (Engelm. ex Torr. & A. Gray) G.L. Nesom -- accepted -- manyray aster
  Syngonium podophyllum var. albolineatum (W. Bull) Engelm. -- not accepted
  Talinum angustissimum (Engelm.) Wooton & Standl. -- not accepted
  Talinum aurantiacum Engelm. -- not accepted -- orange fameflower
  Talinum aurantiacum var. angustissimum Engelm. -- not accepted
  Talinum calycinum Engelm. -- not accepted -- largeflower fameflower, rockpink
  Talinum paniculatum var. sarmentosum (Engelm.) Poelln. -- not accepted -- jewels of Opar
  Talinum spathulatum Engelm. ex A. Gray -- not accepted
  Tetracoccus Engelm. ex Parry -- accepted -- shrubby-spurge
  Tetragonotheca texana Engelm. & A. Gray ex A. Gray -- accepted -- squarebud daisy
  Tetragonothela texana Engelm. & A. Gray ex A. Gray -- not accepted
  Thalictrum fendleri Engelm. ex A. Gray -- accepted -- Fendler's meadow-rue, Fendler's meadowrue
  Thalictrum fendleri var. fendleri Engelm. ex A. Gray -- not accepted -- Fendler's meadow-rue, Fendler's meadowrue
  Thelocactus bicolor var. schottii (Engelm.) Krainz -- not accepted
  Thelocactus setispinus (Engelm.) E.F. Anderson -- accepted -- Biznaga-pezón setosa, fishhook cactus, miniature barrel cactus
  Thelocactus unguispinus (Engelm.) W.T. Marshall -- not accepted
  Tiniaria cristata (Engelm. & A. Gray) Small -- not accepted
  Tithymalopsis curtisii (Engelm.) Small -- not accepted
  Tithymalopsis polyphylla (Engelm. ex Holz.) Small -- not accepted
  Tithymalus arkansanus (Engelm. & A. Gray) Klotzsch & Garcke -- not accepted
  Tithymalus brachycera (Engelm.) Small -- not accepted
  Tithymalus brachycerus (Engelm.) Small -- not accepted
  Tithymalus commutatus (Engelm. ex A. Gray) Klotzsch & Garcke -- not accepted
  Tithymalus crenulatus (Engelm.) A. Heller -- not accepted
  Tithymalus incisa (Engelm.) W.A. Weber -- not accepted
  Tithymalus incisus (Engelm.) W.A. Weber -- not accepted
  Tithymalus leiococcus (Engelm.) Small -- not accepted
  Tithymalus leptocerus (Engelm. ex Boiss.) Arthur -- not accepted
  Tithymalus luridus (Engelm.) Wooton & Standl. -- not accepted
  Tithymalus mexicanus (Engelm.) Wooton & Standl. -- not accepted
  Tithymalus palmeri (Engelm. ex S. Watson) Dayton -- not accepted
  Tithymalus peplidion (Engelm.) Small -- not accepted
  Tithymalus robustus (Engelm.) Small -- not accepted
  Tithymalus schizolobus (Engelm.) Norton -- not accepted
  Tithymalus subpubens (Engelm. ex S. Watson) Norton -- not accepted
  Tithymalus tetraporus (Engelm.) Small -- not accepted
  Toumeya papyracantha (Engelm.) Britton & Rose -- not accepted
  Toxicodendron radicans ssp. pubens (Engelm. ex S. Watson) Gillis -- accepted -- eastern poison ivy
  Toxicodendron radicans var. pubens (Engelm. ex S. Watson) Reveal -- not accepted
  Tragia brevispica Engelm. & A. Gray -- accepted -- shortspike noseburn
  Tsuga caroliniana Engelm. -- accepted -- Carolina hemlock
  Udora verticillata var. minor Engelm. ex Caspary -- not accepted
  Utahia sileri (Engelm. ex J.M. Coult.) Britton & Rose -- not accepted
  Valerianella amarella (Lindh. ex Engelm.) Krok -- accepted -- hairy cornsalad, hairyseed cornsalad
  Valerianella stenocarpa (Engelm. ex A. Gray) Krok -- accepted -- narrowcell cornsalad
  Verbena X paniculatistricta Engelm. -- not accepted
  Vernonia lettermannii Engelm. ex A. Gray -- accepted -- narrowleaf ironweed, slimleaf ironweed
  Vernonia lindheimeri A. Gray & Engelm. -- accepted -- woolly ironweed
  Vitis aestivalis var. canescens Engelm. -- not accepted
  Vitis aestivalis var. cinerea Engelm. -- not accepted
  Vitis aestivalis var. monticola (Buckley) Engelm. -- not accepted
  Vitis arizonica Engelm. -- accepted -- canyon grape
  Vitis candicans Engelm. ex A. Gray -- not accepted
  Vitis cinerea (Engelm.) Engelm. ex Millard -- accepted -- graybark grape, sweet grape
  Vitis cinerea var. canescens (Engelm.) L.H. Bailey -- not accepted
  Vitis cinerea var. cinerea (Engelm.) Engelm. ex Millard -- accepted -- graybark grape
  Vitis cordifolia var. foetida Engelm. -- 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
  Warnockia scutellarioides (Engelm. & A. Gray) M.W. Turner -- accepted -- prairie brazosmint
  Wislizenia Engelm. -- accepted
  Wislizenia refracta Engelm. -- accepted -- jackass clover, spectacle fruit
  Wislizenia refracta ssp. refracta Engelm. -- not accepted -- spectacle fruit
  Wolffia borealis (Engelm. ex Hegelm.) Landolt -- accepted -- dotted watermeal, northern watermeal, watermeal
  Yucca angustissima Engelm. ex Trel. -- accepted -- narrowleaf yucca
  Yucca angustissima var. angustissima Engelm. ex Trel. -- accepted -- fineleaf yucca, narrowleaf yucca
  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 glauca var. mollis Engelm. ex Branner & Coville -- not accepted
  Yucca gloriosa var. recurvifolia (Salisb.) Engelm. -- accepted -- curve-leaf yucca
  Yucca macrocarpa Merriam, non Engelm. -- not accepted
  Yucca macrocarpa Engelm., non Merriam -- not accepted
  Yucca rostrata Engelm. ex Trel. -- accepted -- beaked yucca, Izote Kikapú
  Yucca schottii Engelm. -- not accepted -- Izote de Schott, Schott's yucca
  Yucca tortifolia Lindl. ex Engelm. -- not accepted
  Yucca X schottii Engelm. (pro. sp.) -- accepted -- Schott's yucca
  Zeltnera nudicaulis (Engelm.) G. Mans. -- accepted -- Santa Catalina Mountain centaury
  Zygophyllidium bilobatum (Engelm.) Standl. -- not accepted
  Zygophyllidum exstipulatum (Engelm.) Wooton & Standl. -- not accepted
 
 Kingdom Bacteria
  Megasphaera cerevisiae Engelmann and Weiss, 1986 -- valid
   

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