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Baker's Wheatgrass, Baker's Wildrye: Elymus bakeri (Synonyms: Agropyron bakeri, Agropyron trachycaulum var. bakeri, Elymus trachycaulus ssp. bakeri) -
Great Plains Wildrye: Elymus canadensis var. canadensis (Synonyms: Elymus brachystachys, Elymus canadensis var. brachystachys, Elymus canadensis var. hirsutus, Elymus canadensis var. robustus, Elymus crescendus, Elymus philadelphicus, Elymus philadelphicus var. hirsutus, Elymus robustus) -
Longleaf Squirreltail, Squirreltail, Squirreltail Grass: Elymus elymoides ssp. brevifolius (Synonyms: Elymus elymoides var. brevifolius, Elymus longifolius, Sitanion ciliatum, Sitanion hystrix var. brevifolium, Sitanion longifolium, Sitanion velutinum) -
California Squirreltail, Squirreltail, Squirreltail Grass: Elymus elymoides ssp. californicus (Synonym: Sitanion hystrix var. californicum) -
Squirreltail, Bottlebrush Squirreltail, Bottle-brush Squirreltail: Elymus elymoides ssp. elymoides (Synonyms: Elymus cinereum, Elymus sitanion, Sitanion elymoides, Sitanion glabrum, Sitanion hystrix, Sitanion hystrix var. hystrix, Sitanion rigidum) -
Squirreltail, Squirreltail Grass: Elymus elymoides ssp. hordeoides (Synonyms: Elymus hordeoides, Sitanion hordeoides, Sitanion hystrix var. hordeoides) -
Blue Wildrye, Jepson's Blue Wildrye, Western Wildrye: Elymus glaucus ssp. glaucus (Synonyms: Elymus glaucus var. breviaristatus, Elymus glaucus var. glaucus, Elymus glaucus ssp. jepsonii, Elymus glaucus var. jepsonii, Elymus glaucus var. tenuis) -
Squirreltail Grass: Elymus x hansenii (Synonyms: Elymus glaucus x elymoides or multisetus, xElysitanion hansenii, Sitanion anomalum, Sitanion hanseni, Sitanion hansenii) -
Streambank Whetatgrass, Thickspike Wheatgrass: Elymus lanceolatus ssp. lanceolatus (Synonyms: Agropyron dasystachyum, Agropyron dasystachyum var. dasystachyum, Agropyron dasystachyum var. riparium, Agropyron lanceolatum, Agropyron riparium, Agropyron subvillosum) -
Great Lakes Wheatgrass, Sand-dune Wheatgrass: Elymus lanceolatus ssp. psammophilus (Synonyms: Agropyron dasystachyum ssp. psammophilum, Agropyron dasystachyum var. psammophilum, Agropyron psammophilum, Elytrigia dasystachya ssp. psammophila, Elytrigia dasystachya var. psammophila) -
Streambank Wheatgrass, Thickspike Wheatgrass: Elymus lanceolatus ssp. riparius (Synonyms: Agropyron dasystachyum var. riparium, Agropyron riparium) -
Big Squirreltail: Elymus multisetus (Synonym: Sitanion jubatum) -
False Quackgrass: Elymus x pseudorepens -
Creeping Wildrye, Quackgrass: Elymus repens (Synonyms: Agropyron caesium, Agropyron repens, Agropyron repens var. subulatum, Elytrigia repens, Elytrigia repens var. repens, Elytrigia repens var. vaillantiana, Elytrigia vaillantiana, Triticum repens, Triticum vaillantianum) -
Sierra Wildrye: Elymus sierrus (Synonyms: Agropyron gmelinii var. pringlei, Agropyron pringlei, Elymus sierrae) - ?
Alpine Bearded Wheatgrass: Elymus trachycaulus ssp. subsecundus (Synonyms: Agropyron caninum var. unilaterale, Agropyron subsecundum, Agropyron trachycaulum var. glaucum, Agropyron trachycaulum var. unilaterale) -
Slender Wheatgrass: Elymus trachycaulus ssp. trachycaulus (Synonyms: Agropyron caninum var. andinum, Agropyron pauciflorum, Agropyron secundum, Agropyron secundum var. andinum, Agropyron tenerum, Agropyron trachycaulum var. trachycaulum, Agropyron violaceum var. andinum) -
Arctic Wheatgrass, Broadglumed Wheatgrass: Elymus violaceus (Synonyms: Agropyrum caninum, Agropyron caninum var. latiglume, Agropyron caninum ssp. majus, Agropyron trachycaulum, Agropyron trachycaulum var. latiglume, Agropyron violaceum, Agropyron violaceum var. violaceum, Elymus alaskanus, Elymus alaskanus ssp. latiglumis) -
Snake River Wheatgrass: Elymus wawawaiensis -
Blue Wildrye, Giant Wildrye, Great Basin Lymegrass: Leymus cinereus (Synonyms: Aneurolepidum piperi, Elymus cinereus, Elymus cinereus var. cinereus, Elymus cinereus var. pubens, Elymus condensatus, Elymus condensatus var. condensatus, Elymus condensatus var. pubens, Elymus piperi) -
Giant Wildrye: Leymus condensatus (Synonyms: Aneurolepidium consdensatum, Elymus condensatus, Elymus condensatus var. condensatus) -
Sand Wildrye, Yellow Wildrye: Leymus flavescens: (Synonyms: Elymus arenicola, Elymus flavescens, Leymus arenicola) -
Hybrid Wildrye: Leymus flavescens x Leymus triticoides -
Beardless Wildrye, Creeping Wildrye: Leymus triticoides (Synonyms: Elymus triticoides, Elymus triticoides var. pubescens, Elymus triticoides var. triticoides) -
Medusahead, Medusahead Wildrye: Taeniatherum caput-medusae (Synonym: Elymus caput-medusae) -