| Agropyron hybr. | | a | |
| Agropyron spp. | | a | |
| Agropyron abolinii Drobow | Elymus abolinii (Drobow) Tzvelev | | |
| Agropyron acutum (DC.) Roem. & Schult. | Elytrigia littorea (Schumach.) Hyl. | | |
| Agropyron aegilopoides Drobow | Pseudoroegneria strigosa (M. Bieb.) A. Love subsp. aegilopoides (Drobow) A. Love | | |
| Agropyron agroelymoides (Hicken) J. H. Hunz. | Elymus scabriglumis (Hack.) A. Love | | |
| Agropyron alatavicum Drobow | Kengyilia alatavica (Drobow) J. L. Yang et al. | | |
| Agropyron albicans Scribn. & J. G. Sm. | Elymus albicans (Scribn. & J. G. Sm.) A. Love | | |
| Agropyron albicans Scribn. & J. G. Sm. var. griffithsii (Scribn. & J. G. Sm. ex Piper) Beetle | Elymus albicans (Scribn. & J. G. Sm.) A. Love | | i |
| Agropyron amurense Drobow | Elymus ciliaris (Trin.) Tzvelev subsp. amurensis (Drobow) Tzvelev | | |
| Agropyron angustiglume Nevski | Elymus mutabilis (Drobow) Tzvelev subsp. mutabilis | | |
| Agropyron antarcticum Parodi | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron antiquus Nevski | Elymus antiquus (Nevski) Tzvelev | | |
| Agropyron araucanum (Parodi) Parodi | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron arizonicum Scribn. & J. G. Sm. | Elymus arizonicus (Scribn. & J. G. Sm.) Gould | | |
| Agropyron attenuatum (Kunth) Roem. & Schult. var. araucanum Parodi | Elymus magellanicus (E. Desv.) A. Love | | i |
| Agropyron aucheri Boiss. | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. barbulatum (Schur) Barkworth & D. R. Dewey | | |
| Agropyron bakeri E. E. Nelson | Elymus bakeri (E. E. Nelson) A. Love | | |
| Agropyron barbicallum Ohwi | Elymus barbicallus (Ohwi) S. L. Chen | | |
| Agropyron barbulatum Schur | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. barbulatum (Schur) Barkworth & D. R. Dewey | | |
| Agropyron batalinii (Krasn.) Roshev. | Kengyilia batalinii (Krasn.) J. L. Yang et al. | | |
| Agropyron bessarabicum Savul. & Rayss | Thinopyrum bessarabicum (Savul. & Rayss) A. Love | | |
| Agropyron bonaepartis (Spreng.) T. Durand & Schinz | Eremopyrum bonaepartis (Spreng.) Nevski | | |
| Agropyron bonaepartis (Spreng.) T. Durand & Schinz var. pilosum Grossh. | Eremopyrum bonaepartis (Spreng.) Nevski | | i |
| Agropyron boreale (Turcz.) Drobow | Elymus kronokensis (Kom.) Tzvelev subsp. subalpinus (Neuman) Tzvelev | | |
| Agropyron borianum Melderis | Elymus borianus (Melderis) Cope | | |
| Agropyron brachyphyllum Boiss. & Hausskn. | Elymus brachyphyllus (Boiss. & Hausskn.) A. Love | | |
| Agropyron brandzae Pantu & Solacolu | Agropyron cristatum (L.) Gaertn. subsp. brandzae (Pantu & Solacolu) Melderis | | |
| Agropyron breviaristatum Hitchc. | Elymus angulatus J. Presl | | |
| Agropyron burchan-buddae Nevski | Elymus burchan-buddae (Nevski) Tzvelev | | |
| Agropyron buschianum Roshev. | Elymus buschianus (Roshev.) Tzvelev | | |
| Agropyron caespitosum K. Koch | Thinopyrum caespitosum (K. Koch) Zhi W. Liu & R. R.-C. Wang | | |
| Agropyron campestre Godr. & Gren. | Thinopyrum pungens (Pers.) Barkworth | | |
| Agropyron canaliculatum Nevski | Elymus canaliculatus (Nevski) Tzvelev | | |
| Agropyron caninum (L.) P. Beauv. | Elymus caninus (L.) L. | | |
| Agropyron caninum (L.) P. Beauv. unranked muticum Holmb. | Elymus caninus (L.) L. | | i |
| Agropyron chinense (Trin.) Ohwi | Leymus chinensis (Trin.) Tzvelev | | |
| Agropyron ciliare (Trin.) Franch. | Elymus ciliaris (Trin.) Tzvelev subsp. ciliaris | | |
| Agropyron ciliatiflorum Roshev. | Thinopyrum podperae (Nabelek) D. R. Dewey | | |
| Agropyron cimmericum Nevski | | a | |
| Agropyron cognatum Hack. | Pseudoroegneria cognata (Hack.) A. Love | | |
| Agropyron confusum Roshev. | Elymus confusus (Roshev.) Tzvelev | | |
| Agropyron cristatum (L.) Gaertn. | | a | |
| Agropyron cristatum (L.) Gaertn. subsp. brandzae (Pantu & Solacolu) Melderis | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. cristatum | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. desertorum (Fisch. ex Link) A. Love | Agropyron desertorum (Fisch. ex Link) Schult. | | i |
| Agropyron cristatum (L.) Gaertn. subsp. imbricatum (Roem. & Schult.) A. Love | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev unranked imbricatum (Roem. & Schult.) Beck | | i |
| Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev unranked imbricatum (Roem. & Schult.) Beck | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev var. pectinatum (M. Bieb.) Tzvelev | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. puberulum (Boiss.) Tzvelev | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev unranked imbricatum (Roem. & Schult.) Beck | | i |
| Agropyron cristatum (L.) Gaertn. subsp. sabulosum Lavrenko | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. sclerophyllum Novopokr. ex Tzvelev | | a | i |
| Agropyron cristatum (L.) Gaertn. subsp. tarbagataicum (N. Plotn.) Tzvelev | | a | i |
| Agropyron cristatum (L.) Gaertn. var. puberulum Boiss. | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev unranked imbricatum (Roem. & Schult.) Beck | | i |
| Agropyron curvifolium Lange | Thinopyrum curvifolium (Lange) D. R. Dewey | | |
| Agropyron dagnae Grossh. | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev var. pectinatum (M. Bieb.) Tzvelev | | |
| Agropyron dasyanthum Ledeb. | | a | |
| Agropyron dasystachyum (Hook.) Scribn. | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. lanceolatus | | |
| Agropyron dasystachyum (Hook.) Scribn. var. riparium (Scribn. & J. G. Sm.) Bowden | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. riparius (Scribn. & J. G. Sm.) Barkworth | | i |
| Agropyron dentatum Hook. f. | Elymus dentatus (Hook. f.) Tzvelev | | i |
| Agropyron desertorum (Fisch. ex Link) Schult. | | a | |
| Agropyron deweyi A. Love | Agropyron cristatum (L.) Gaertn. | | |
| Agropyron distans K. Koch | Eremopyrum distans (K. Koch) Nevski | | |
| Agropyron distichum (Thunb.) P. Beauv. | Thinopyrum distichum (Thunb.) A. Love | | |
| Agropyron divaricatum Boiss. & Balansa | Pseudoroegneria divaricata (Boiss. & Balansa) A. Love | | |
| Agropyron divergens Vasey | Pseudoroegneria spicata (Pursh) A. Love | | |
| Agropyron divergens Vasey var. inerme Scribn. & J. G. Sm. | Pseudoroegneria spicata (Pursh) A. Love | | i |
| Agropyron donianum F. B. White | Elymus donianus (F. B. White) A. Love & D. Love | | |
| Agropyron drobovii Nevski | Elymus drobovii (Nevski) Tzvelev | | |
| Agropyron elmeri Scribn. | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. lanceolatus | | |
| Agropyron elongatiforme Drobow | Elymus repens (L.) Gould subsp. elongatiformis (Drobow) Melderis | | |
| Agropyron elongatum (Host) P. Beauv. | Thinopyrum elongatum (Host) D. R. Dewey | | |
| Agropyron elongatum auct. nonn. | Thinopyrum ponticum (Podp.) Barkworth & D. R. Dewey | | |
| Agropyron elymoides Hack. | Elymus lineariglumis Seberg & Petersen | | |
| Agropyron enysii Kirk | Stenostachys enysii (Kirk) Barkworth & S. W. L. Jacobs | | |
| Agropyron ferganense Drobow | Pseudoroegneria cognata (Hack.) A. Love | | |
| Agropyron fibrosum (Schrenk) P. Candargy | Elymus fibrosus (Schrenk) Tzvelev subsp. fibrosus | | |
| Agropyron firmum J. Presl | Elymus repens (L.) Gould subsp. repens | | |
| Agropyron fragile (Roth) P. Candargy | | a | |
| Agropyron fragile (Roth) P. Candargy subsp. fragile | Agropyron fragile (Roth) P. Candargy | | i |
| Agropyron fragile (Roth) P. Candargy subsp. sibiricum (Willd.) Melderis | Agropyron fragile (Roth) P. Candargy | | i |
| Agropyron fuegianum (Speg.) Kurtz | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron geniculatum (Trin. ex Ledeb.) K. Koch | Pseudoroegneria geniculata (Trin.) A. Love subsp. geniculata | | |
| Agropyron gentryi Melderis | Thinopyrum gentryi (Melderis) D. R. Dewey | | |
| Agropyron glaucissimum Popov | Elymus glaucissimus (Popov) Tzvelev | | |
| Agropyron glaucum (Desf. ex DC.) Roem. & Schult. | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. intermedium | | i |
| Agropyron glaucum (Desf.) Roem. & Schult. var. occidentale Scribn. | Pascopyrum smithii (Rydb.) Barkworth & D. R. Dewey | | i |
| Agropyron gmelinii (Ledeb.) Scribn. & J. G. Sm. | Elymus gmelinii (Trin.) Tzvelev | | |
| Agropyron gracillimum Nevski | Pseudoroegneria gracillima (Nevski) A. Love | | |
| Agropyron griffithsii Scribn. & J. G. Sm. ex Piper | Elymus albicans (Scribn. & J. G. Sm.) A. Love | | |
| Agropyron humidum Ohwi & Sakam. | Elymus humidus (Ohwi & Sakam.) A. Love | | |
| Agropyron imbricatum Roem. & Schult. | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev unranked imbricatum (Roem. & Schult.) Beck | | |
| Agropyron inerme (Scribn. & J. G. Sm.) Rydb. | Pseudoroegneria spicata (Pursh) A. Love | | |
| Agropyron intermedium (Host) P. Beauv. | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. intermedium | | |
| Agropyron intermedium (Host) P. Beauv. var. trichophorum (Link) Halacsy | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. barbulatum (Schur) Barkworth & D. R. Dewey | | i |
| Agropyron interruptum Nevski | Elymus praeruptus Tzvelev | | |
| Agropyron japonense Honda | Elymus ciliaris (Trin.) Tzvelev subsp. japonicus A. Love | | |
| Agropyron japonicum Honda | Elymus ciliaris (Trin.) Tzvelev subsp. japonicus A. Love | | |
| Agropyron junceiforme A. Love & D. Love | Thinopyrum junceiforme (A. Love & D. Love) A. Love | | |
| Agropyron junceum (L.) P. Beauv. | Thinopyrum junceum (L.) A. Love | | |
| Agropyron junceum (L.) P. Beauv. subsp. boreali-atlanticum Simonet & Guin. | Thinopyrum junceiforme (A. Love & D. Love) A. Love | | i |
| Agropyron junceum (L.) P. Beauv. subsp. mediterraneum Simonet | Thinopyrum junceum (L.) A. Love | | i |
| Agropyron kamoji Ohwi | Elymus tsukushiensis Honda var. transiens (Hack.) Osada | | |
| Agropyron karataviense Pavlov | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev var. pectinatum (M. Bieb.) Tzvelev | | |
| Agropyron kengii Tzvelev | Kengyilia hirsuta (Keng) J. L. Yang et al. | | |
| Agropyron kirkii Zotov | Anthosachne multiflora (Banks & Sol. ex Hook. f.) C. Yen & J. L. Yang subsp. multiflora | | |
| Agropyron komarovii Nevski | Elymus uralensis (Nevski) Tzvelev subsp. komarovii (Nevski) Tzvelev | | |
| Agropyron kosaninii Nabelek | Pseudoroegneria kosaninii (Nabelek) A. Love | | |
| Agropyron krylovianum Schischk. | Agropyron pumilum P. Candargy | | |
| Agropyron kuramense Melderis | Elymus semicostatus (Nees ex Steud.) Melderis | | |
| Agropyron lanceolatum Scribn. & J. G. Sm. | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. lanceolatus | | |
| Agropyron lasianthum Boiss. | Eremopyrum distans (K. Koch) Nevski | | |
| Agropyron latiglume (Scribn. & J. G. Sm.) Rydb. | Elymus violaceus (Hornem.) Feilberg | | |
| Agropyron lavrenkoanum Prokudin | Agropyron cristatum (L.) Gaertn. subsp. sabulosum Lavrenko | | |
| Agropyron leptourum (Nevski) Grossh. | Elymus transhyrcanus (Nevski) Tzvelev | | |
| Agropyron libanoticum Hack. | Pseudoroegneria libanotica (Hack.) D. R. Dewey | | |
| Agropyron ligusticum Savign. | Aegilops speltoides Tausch var. ligustica (Savign.) Fiori | | |
| Agropyron littorale Dumort. | Thinopyrum pycnanthum (Godr.) Barkworth | | |
| Agropyron lolioides P. Candargy | Elytrigia lolioides (P. Candargy) Nevski | | |
| Agropyron longearistatum (Boiss.) Boiss. | Elymus longearistatus (Boiss.) Tzvelev | | |
| Agropyron macrourum (Turcz. ex Steud.) Drobow | Elymus macrourus (Turcz. ex Steud.) Tzvelev | | |
| Agropyron magellanicum (E. Desv.) Hack. | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron mayebaranum Honda | Elymus mayebaranus (Honda) S. L. Chen | | |
| Agropyron melantherum Keng | Kengyilia melanthera (Keng) J. L. Yang et al. | | |
| Agropyron michnoi Roshev. | | a | |
| Agropyron michnoi Roshev. subsp. nathaliae (Sipliv.) Tzvelev | Agropyron nathaliae Sipliv. | | i |
| Agropyron mongolicum Keng | | a | |
| Agropyron multiflorum (Banks & Sol. ex Hook. f.) Kirk ex Cheeseman | Anthosachne multiflora (Banks & Sol. ex Hook. f.) C. Yen & J. L. Yang subsp. multiflora | | i |
| Agropyron multiflorum (Banks & Sol. ex Hook. f.) Kirk ex Cheeseman var. longisetum Hack. | Anthosachne multiflora (Banks & Sol. ex Hook. f.) C. Yen & J. L. Yang subsp. multiflora | | i |
| Agropyron muricatum Fisch. ex Eichw. | Agropyron cristatum (L.) Gaertn. | | |
| Agropyron mutabile Drobow | Elymus mutabilis (Drobow) Tzvelev | | |
| Agropyron nathaliae Sipliv. | | a | |
| Agropyron nodosum Nevski | Thinopyrum caespitosum (K. Koch) Zhi W. Liu & R. R.-C. Wang | | |
| Agropyron novae-angliae Scribn. | Elymus trachycaulus (Link) Gould ex Shinners subsp. trachycaulus | | |
| Agropyron nutans Keng | Elymus burchan-buddae (Nevski) Tzvelev | | |
| Agropyron obtusiusculum Lange | Elytrigia obtusiuscula (Lange) Hyl. | | |
| Agropyron occidentale (Scribn.) Scribn. | Pascopyrum smithii (Rydb.) Barkworth & D. R. Dewey | | |
| Agropyron orientale (L.) Roem. & Schult. | Eremopyrum orientale (L.) Jaub. & Spach | | |
| Agropyron orientale (L.) Roem. & Schult. subsp. lanuginosum (Griseb.) K. Richt. | Eremopyrum distans (K. Koch) Nevski | | i |
| Agropyron orientale (L.) Roem. & Schult. var. lasianthum (Boiss.) Boiss. | Eremopyrum distans (K. Koch) Nevski | | i |
| Agropyron orientale (L.) Roem. & Schult. var. sublanuginosum Drobow | Eremopyrum bonaepartis (Spreng.) Nevski | | i |
| Agropyron panormitanum Parl. | Elymus panormitanus (Parl.) Tzvelev | | |
| Agropyron parishii Scribn. & J. G. Sm. | Elymus stebbinsii Gould | | |
| Agropyron patagonicum (Speg.) Parodi | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron pauciflorum (Schwein.) Hitchc. | Elymus trachycaulus (Link) Gould ex Shinners subsp. trachycaulus | | |
| Agropyron pectinatum (Labill.) P. Beauv. | Australopyrum pectinatum (Labill.) A. Love | | |
| Agropyron pectinatum auct. nonn. | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev var. pectinatum (M. Bieb.) Tzvelev | | |
| Agropyron pectiniforme Roem. & Schult. | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev var. pectinatum (M. Bieb.) Tzvelev | | |
| Agropyron pectiniforme Roem. & Schult. var. karabaljikji ined.? | Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev var. pectinatum (M. Bieb.) Tzvelev | | i |
| Agropyron pinifolium Nevski | Agropyron cristatum (L.) Gaertn. subsp. sclerophyllum Novopokr. ex Tzvelev | | |
| Agropyron podperae Nabelek | Thinopyrum podperae (Nabelek) D. R. Dewey | | |
| Agropyron popovii Drobow | Kengyilia pulcherrima (Grossh.) C. Yen et al. | | |
| Agropyron praecaespitosum Nevski | Elymus mutabilis (Drobow) Tzvelev subsp. praecaespitosus (Nevski) Tzvelev | | |
| Agropyron prostratum (Pall.) P. Beauv. | Eremopyrum triticeum (Gaertn.) Nevski | | |
| Agropyron pruinifera Nevski | Pseudoroegneria geniculata (Trin.) A. Love subsp. pruinifera (Nevski) A. Love | | |
| Agropyron psammophilum J. M. Gillett & H. Senn | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. psammophilus (J. M. Gillett & H. Senn) A. Love | | |
| Agropyron pseudorepens Scribn. & J. G. Sm. | Elymus pseudorepens (Scribn. & J. G. Sm.) Barkworth & D. R. Dewey | | |
| Agropyron pubiflorum (Steud.) Parodi | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron pulcherrimum Grossh. | Kengyilia pulcherrima (Grossh.) C. Yen et al. | | |
| Agropyron pumilum P. Candargy | | a | |
| Agropyron pungens (Pers.) Roem. & Schult. | Thinopyrum pungens (Pers.) Barkworth | | |
| Agropyron pycnanthum (Godr.) Godr. & Gren. | Thinopyrum pycnanthum (Godr.) Barkworth | | |
| Agropyron ramosum (Trin.) K. Richt. | Leymus ramosus (Trin.) Tzvelev | | |
| Agropyron rechingeri Runemark | Thinopyrum sartorii (Boiss. & Heldr.) A. Love | | |
| Agropyron remotiflorum Parodi | Elymus magellanicus (E. Desv.) A. Love | | |
| Agropyron repens (L.) P. Beauv. | Elymus repens (L.) Gould subsp. repens | | |
| Agropyron repens (L.) P. Beauv. var. bromiforme Schur | Elymus repens (L.) Gould | | i |
| Agropyron repens (L.) P. Beauv. var. glaucescens Peterm. | Elymus repens (L.) Gould | | i |
| Agropyron repens (L.) P. Beauv. var. scabriglume Hack. | Elymus scabriglumis (Hack.) A. Love | | i |
| Agropyron retrofractum Vickery | Australopyrum retrofractum (Vickery) A. Love | | |
| Agropyron rigidum (Schrad.) P. Beauv. | Thinopyrum elongatum (Host) D. R. Dewey | | |
| Agropyron riparium Scribn. & J. G. Sm. | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. riparius (Scribn. & J. G. Sm.) Barkworth | | |
| Agropyron russellii Melderis | Elymus russellii (Melderis) Cope | | |
| Agropyron scabrifolium (Doll) Parodi | Elymus scabrifolius (Doll) J. H. Hunz. | | |
| Agropyron scabriglume (Hack.) Parodi | Elymus scabriglumis (Hack.) A. Love | | |
| Agropyron scabrum (R. Br.) P. Beauv. | Anthosachne scabra (R. Br.) Nevski | | |
| Agropyron scabrum (R. Br.) P. Beauv. var. tenue Buchanan | Connorochloa tenuis (Buchanan) Barkworth et al. | | i |
| Agropyron scabrum R. Br. var. plurinerve Vickery | Anthosachne plurinervis (Vickery) Barkworth & S. W. L. Jacobs | | i |
| Agropyron schugnanicum Nevski | Elymus schugnanicus (Nevski) Tzvelev | | |
| Agropyron scirpeum C. Presl | Thinopyrum scirpeum (C. Presl) D. R. Dewey | | |
| Agropyron scirpeum C. Presl var. flaccidifolium Boiss. & Heldr. | Thinopyrum scirpeum (C. Presl) D. R. Dewey | | i |
| Agropyron scribneri Vasey | Elymus scribneri (Vasey) M. E. Jones | | |
| Agropyron scythicum Nevski | Pseudoroegneria geniculata (Trin.) A. Love subsp. scythica (Nevski) A. Love | | |
| Agropyron semicostatum (Steud.) Boiss. | Elymus semicostatus (Nees ex Steud.) Melderis | | |
| Agropyron semicostatum Nees var. transiens Hack. | Elymus tsukushiensis Honda var. transiens (Hack.) Osada | | i |
| Agropyron sibiricum (Willd.) P. Beauv. | Agropyron fragile (Roth) P. Candargy | | |
| Agropyron sibiricum (Willd.) P. Beauv. var. desertorum (Fisch. ex Link) Boiss. | Agropyron desertorum (Fisch. ex Link) Schult. | | i |
| Agropyron smithii Rydb. | Pascopyrum smithii (Rydb.) Barkworth & D. R. Dewey | | |
| Agropyron smithii Rydb. var. molle (Scribn. & J. G. Sm.) M. E. Jones | Pascopyrum smithii (Rydb.) Barkworth & D. R. Dewey | | i |
| Agropyron spicatum (Pursh) Scribn. & J. G. Sm. | Pseudoroegneria spicata (Pursh) A. Love | | |
| Agropyron spicatum (Pursh) Scribn. & J. G. Sm. f. inerme (Scribn. & J. G. Sm.) Beetle | Pseudoroegneria spicata (Pursh) A. Love | | i |
| Agropyron spicatum (Pursh) Scribn. & J. G. Sm. var. inerme (Scribn. & J. G. Sm.) A. Heller | Pseudoroegneria spicata (Pursh) A. Love | | i |
| Agropyron spicatum (Pursh) Scribn. & J. G. Sm. var. molle Scribn. & J. G. Sm. | Pascopyrum smithii (Rydb.) Barkworth & D. R. Dewey | | i |
| Agropyron squarrosum Link | Eremopyrum bonaepartis (Spreng.) Nevski | | |
| Agropyron stenostachyum Melderis | Elymus stenostachyus (Melderis) O. Anders & Podlech | | |
| Agropyron stipifolium Czern. ex Nevski | Pseudoroegneria stipifolia (Czern. ex Nevski) A. Love | | |
| Agropyron striatum (Steud.) Hook. f. | Elymus semicostatus (Nees ex Steud.) Melderis | | i |
| Agropyron strigosum (M. Bieb.) Boiss. | Pseudoroegneria strigosa (M. Bieb.) A. Love subsp. strigosa | | |
| Agropyron strigosum (M. Bieb.) Boiss. subsp. aegilopoides (Drobow) Tzvelev | Pseudoroegneria strigosa (M. Bieb.) A. Love subsp. aegilopoides (Drobow) A. Love | | i |
| Agropyron subsecundum (Link) Hitchc. | Elymus trachycaulus (Link) Gould ex Shinners subsp. subsecundus (Link) A. Love & D. Love | | |
| Agropyron subulatum (Banks & Sol.) Roem. & Schult. | Loliolum subulatum (Banks & Sol.) Eig | | |
| Agropyron tanaiticum Nevski | | a | |
| Agropyron tarbagataicum N. Plotn. | Agropyron cristatum (L.) Gaertn. subsp. tarbagataicum (N. Plotn.) Tzvelev | | |
| Agropyron tauri Boiss. & Balansa | Pseudoroegneria tauri (Boiss. & Balansa) A. Love | | |
| Agropyron tenerum Vasey | Elymus trachycaulus (Link) Gould ex Shinners subsp. trachycaulus | | |
| Agropyron thoroldianus Oliv. | Kengyilia thoroldiana (Oliv.) J. L. Yang et al. | | |
| Agropyron tianschanicum Drobow | Elymus uralensis (Nevski) Tzvelev subsp. tianschanicus (Drobow) Tzvelev | | |
| Agropyron tibeticum Melderis | Elymus tibeticus (Melderis) G. Singh | | |
| Agropyron tilcarensis J. H. Hunz. | Elymus tilcarensis (J. H. Hunz.) A. Love | | |
| Agropyron trachycaulum (Link) Malte ex H. F. Lewis | Elymus trachycaulus (Link) Gould ex Shinners subsp. trachycaulus | | |
| Agropyron trachycaulum (Link) Malte ex H. F. Lewis var. unilaterale Malte | Elymus trachycaulus (Link) Gould ex Shinners subsp. subsecundus (Link) A. Love & D. Love | | i |
| Agropyron transbaicalense Nevski | Elymus transbaicalensis (Nevski) Tzvelev | | |
| Agropyron trichophorum (Link) K. Richt. | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. barbulatum (Schur) Barkworth & D. R. Dewey | | |
| Agropyron trichophorum var. luteslum | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey subsp. barbulatum (Schur) Barkworth & D. R. Dewey | | i |
| Agropyron triticeum Gaertn. | Eremopyrum triticeum (Gaertn.) Nevski | | |
| Agropyron tschimganica Drobow | Elymus tschimganicus (Drobow) Tzvelev | | |
| Agropyron tsukushiense (Honda) Ohwi | Elymus tsukushiensis Honda var. tsukushiensis | | |
| Agropyron tsukushiense (Honda) Ohwi var. transiens (Hack.) Ohwi | Elymus tsukushiensis Honda var. transiens (Hack.) Osada | | i |
| Agropyron turczaninovii Drobow | Elymus gmelinii (Trin.) Tzvelev | | |
| Agropyron ugamicum Drobow | Elymus nevskii Tzvelev | | |
| Agropyron unilaterale Cassidy | Elymus trachycaulus (Link) Gould ex Shinners subsp. subsecundus (Link) A. Love & D. Love | | |
| Agropyron uralense Nevski | Elymus uralensis (Nevski) Tzvelev subsp. uralensis | | |
| Agropyron vaillantianum (Wulfen) Trautv. | Elymus repens (L.) Gould | | |
| Agropyron varnense (Velen.) Hayek | Thinopyrum intermedium (Host) Barkworth & D. R. Dewey | | |
| Agropyron velutinum Nees | Australopyrum velutinum (Nees) B. K. Simon | | |
| Agropyron villosum (L.) Link | Dasypyrum villosum (L.) P. Candargy | | |
| Agropyron violaceum (Hornem.) Lange | Elymus violaceus (Hornem.) Feilberg | | |
| Agropyron violaceum (Hornem.) Lange var. latiglume Scribn. & J. G. Sm. | Elymus violaceus (Hornem.) Feilberg | | i |
| Agropyron violaceum (Hornem.) Lange var. virescens Lange | Elymus trachycaulus (Link) Gould ex Shinners subsp. virescens (Lange) A. Love & D. Love | | i |
| Agropyron yezoense Honda | Elymus nipponicus Jaaska | | |
| Agropyron yukonense auct. | Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. psammophilus (J. M. Gillett & H. Senn) A. Love | | |
| Agropyron yukonense Scribn. & Merr. | Elymus yukonensis (Scribn. & Merr.) A. Love | | |