Elymus (plant)
Elymus is a genus of perennial plants with approximately 150 species in the grass family,  related to rye, wheat, and other widely grown cereal grains.

Elymus is a cosmopolitan genus, represented by species across all continents of the world.
Common names include couch grass, wildrye and wheatgrass.

Many species once considered members of Elymus are now regarded as better suited to other genera: Agropyron, Anthosachne, Brachypodium, Cenchrus, Crithopsis, Heteranthelium, Jouvea, Kengyilia, Leymus, Psathyrostachys, Stenostachys, Taeniatherum, Thinopyrum etc.

The following species are recognised by The Plant List:

 Elymus abolinii
 Elymus afghanicus
 Elymus africanus
 Elymus alatavicus
 Elymus albicans
 Elymus alienus
 Elymus alopex
 Elymus alpinus
 Elymus altissimus
 Elymus angsaiensis
 Elymus angulatus
 Elymus angustispiculatus
 Elymus anthosachnoides
 Elymus antiquus
 Elymus apricus
 Elymus arcuatus
 Elymus aristiglumis
 Elymus arizonicus
 Elymus athericus
 Elymus atratus
 Elymus bakeri
 Elymus barbatus
 Elymus barbicallus
 Elymus barystachyus
 Elymus batalinii
 Elymus borianus
 Elymus × brachyphyllus
 Elymus brevipes
 Elymus bungeanus
 Elymus burchan-buddae
 Elymus buschianus
 Elymus cacuminus
 Elymus caesifolius
 Elymus caianus
 Elymus calcicola
 Elymus calderi
 Elymus californicus
 Elymus canadensis
 Elymus caninus
 Elymus caucasicus
 Elymus cheniae
 Elymus churchii
 Elymus ciliaris
 Elymus cinereus
 Elymus clivorum
 Elymus cognatus
 Elymus colorans
 Elymus confusus
 Elymus cordilleranus
 Elymus curtiaristatus
 Elymus curvatiformis
 Elymus curvifolius
 Elymus × czilikensis
 Elymus czimganicus
 Elymus dahuricus
 Elymus debilis
 Elymus dentatus
 Elymus distichus
 Elymus diversiglumis
 Elymus dolichatherus
 Elymus drobovii
 Elymus × drucei
 Elymus durus
 Elymus duthiei
 Elymus × ebingeri
 Elymus edelbergii
 Elymus elongatus
 Elymus elymoides
 Elymus enysii
 Elymus erosiglumis
 Elymus falcis
 Elymus farctus
 Elymus fedtschenkoi
 Elymus festucoides
 Elymus fibrosus
 Elymus flaccidifolius
 Elymus formosanus
 Elymus geminatus
 Elymus gentryi
 Elymus glaberrimus
 Elymus glaucissimus
 Elymus glaucus
 Elymus gmelinii
 Elymus grandiglumis
 Elymus grandis
 Elymus × hansenii
 Elymus himalayanus
 Elymus hirsutus
 Elymus hispidus
 Elymus hitchcockii
 Elymus hoffmannii
 Elymus hondae
 Elymus hongyuanensis
 Elymus hordeoides
 Elymus humidorum
 Elymus humilis
 Elymus hybridus
 Elymus hystrix
 Elymus × incertus
 Elymus interruptus
 Elymus intramongolicus
 Elymus ircutensis
 Elymus jacquemontii
 Elymus jacutensis
 Elymus karakabinicus
 Elymus kaschgaricus
 Elymus kengii
 Elymus khokhrjakovii
 Elymus kokonoricus
 Elymus kuramensis
 Elymus lancangensis
 Elymus lanceolatus
 Elymus laxiflorus
 Elymus laxinodis
 Elymus lazicus
 Elymus leiotropis
 Elymus lenensis
 Elymus libanoticus
 Elymus × littoreus
 Elymus lolioides
 Elymus longiaristatus
 Elymus longifolius
 Elymus longisetus
 Elymus macgregorii
 Elymus macgregoriorum
 Elymus macrochaetus
 Elymus macrourus
 Elymus magadanensis
 Elymus magellanicus
 Elymus magnicaespes
 Elymus magnipodus
 Elymus × maltei
 Elymus marginatus
 Elymus melantherus
 Elymus mendocinus
 Elymus mollis
 Elymus × mucronatus
 Elymus multiflorus
 Elymus multisetus
 Elymus mutabilis
 Elymus nakaii
 Elymus nepalensis
 Elymus nipponicus
 Elymus nodosus
 Elymus × nothus
 Elymus nutans
 Elymus × obtusiusculus
 Elymus × oliveri
 Elymus panormitanus
 Elymus parviglume
 Elymus patagonicus
 Elymus pendulinus
 Elymus petrovii
 Elymus plurinervis
 Elymus praeruptus
 Elymus probatovae
 Elymus pseudocaninus
 Elymus puberulus
 Elymus pulanensis
 Elymus pungens
 Elymus purpuraristus
 Elymus purpurascens
 Elymus pycnanthus
 Elymus rectisetus
 Elymus reflexiaristatus
 Elymus repens
 Elymus retroflexus
 Elymus retusus
 Elymus rigidulus
 Elymus riparius
 Elymus russellii
 Elymus sacandros
 Elymus sajanensis
 Elymus × saundersii
 Elymus × saxicola
 Elymus scabridulus
 Elymus scabrifolius
 Elymus scabriglumis
 Elymus scabrus
 Elymus schrenkianus
 Elymus schugnanicus
 Elymus sclerophyllus
 Elymus scribneri
 Elymus semicostatus
 Elymus serotinus
 Elymus serpentinus
 Elymus shandongensis
 Elymus shouliangiae
 Elymus sibinicus
 Elymus sibiricus
 Elymus sierrae
 Elymus sikkimensis
 Elymus sinkiangensis
 Elymus sinoflexuosus
 Elymus sinosubmuticus
 Elymus smithii
 Elymus solandri
 Elymus sosnowskyi
 Elymus spicatus
 Elymus × spurius
 Elymus stebbinsii
 Elymus stenachyrus
 Elymus stenostachyus
 Elymus stewartii
 Elymus stipifolius
 Elymus strictus
 Elymus submuticus
 Elymus svensonii
 Elymus sylvaticus
 Elymus tangutorum
 Elymus tauri
 Elymus tenuis
 Elymus tenuispicus
 Elymus texensis
 Elymus thoroldianus
 Elymus tibeticus
 Elymus tilcarensis
 Elymus trachycaulus
 Elymus transhyrcanus
 Elymus trichospicula
 Elymus tridentatus
 Elymus troctolepis
 Elymus tsukushiensis
 Elymus uralensis
 Elymus varius
 Elymus versicolor
 Elymus villifer
 Elymus villosus
 Elymus virginicus
 Elymus viridulus
 Elymus vulpinus
 Elymus × wallii
 Elymus wawawaiensis
 Elymus woroschilowii
 Elymus yangiae
 Elymus yukonensis
 Elymus yushuensis
 Elymus zejensis
 Elymus zhui