| Hordeum andicola Griseb. | Hordeum muticum J. Presl | | | Hordeum andicola Griseb. | Hordeum muticum J. Presl | 19265 | 19315 |
| Hordeum bogdanii Wilensky | | a | | Hordeum bogdanii Wilensky | | 19266 | |
| Hordeum brachyantherum Nevski | | a | | Hordeum brachyantherum Nevski | | 19267 | |
| Hordeum brevisubulatum (Trin.) Link | | a | | Hordeum brevisubulatum (Trin.) Link | | 19269 | |
| Hordeum caespitosum Scribn. | Hordeum jubatum L. subsp. intermedium Bowden | | | Hordeum caespitosum Scribn. | Hordeum jubatum L. subsp. intermedium Bowden | 19271 | 460172 |
| Hordeum chilense Roem. & Schult. | | a | | Hordeum chilense Roem. & Schult. | | 19272 | |
| Hordeum comosum J. Presl | | a | | Hordeum comosum J. Presl | | 19274 | |
| Hordeum compressum Griseb. | Hordeum stenostachys Godr. | | | Hordeum compressum Griseb. | Hordeum stenostachys Godr. | 19275 | 19328 |
| Hordeum depressum (Scribn. & J. G. Sm.) Rydb. | | a | | Hordeum depressum (Scribn. & J. G. Sm.) Rydb. | | 19281 | |
| Hordeum geniculatum All. | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | | | Hordeum geniculatum All. | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | 19294 | 102508 |
| Hordeum gussoneanum Parl. | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | | | Hordeum gussoneanum Parl. | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | 19296 | 102508 |
| Hordeum halophilum Griseb. | Hordeum pubiflorum Hook. f. subsp. halophilum (Griseb.) Baden & Bothmer | | | Hordeum halophilum Griseb. | Hordeum pubiflorum Hook. f. subsp. halophilum (Griseb.) Baden & Bothmer | 19297 | 418599 |
| Hordeum hexaploidum Covas | Hordeum procerum Nevski | | | Hordeum hexaploidum Covas | Hordeum procerum Nevski | 19298 | 19321 |
| Hordeum hystrix Roth | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | | | Hordeum hystrix Roth | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | 19300 | 102508 |
| Hordeum jubatum L. | | a | | Hordeum jubatum L. | | 19308 | |
| Hordeum jubatum L. var. caespitosum (Scribn.) Hitchc. | Hordeum jubatum L. subsp. intermedium Bowden | | i | Hordeum jubatum L. var.caespitosum (Scribn.) Hitchc. | Hordeum jubatum L. subsp. intermedium Bowden | 19309 | 460172 |
| Hordeum lechleri (Steud.) Schenck | | a | | Hordeum lechleri (Steud.) Schenck | | 19310 | |
| Hordeum marinum Huds. | | a | | Hordeum marinum Huds. | | 19312 | |
| Hordeum maritimum With. | Hordeum marinum Huds. subsp. marinum | | | Hordeum maritimum With. | Hordeum marinum Huds. subsp. marinum | 19313 | 317386 |
| Hordeum muticum J. Presl | | a | | Hordeum muticum J. Presl | | 19315 | |
| Hordeum parodii Covas | | a | | Hordeum parodii Covas | | 19318 | |
| Hordeum procerum Nevski | | a | | Hordeum procerum Nevski | | 19321 | |
| Hordeum pusillum Nutt. | | a | | Hordeum pusillum Nutt. | | 19322 | |
| Hordeum secalinum Schreb. | | a | | Hordeum secalinum Schreb. | | 19324 | |
| Hordeum secalinum Schreb. var. brevisubulatum Trin. | Hordeum brevisubulatum (Trin.) Link subsp. brevisubulatum | | i | Hordeum secalinum Schreb. var.brevisubulatum Trin. | Hordeum brevisubulatum (Trin.) Link subsp. brevisubulatum | 19325 | 317399 |
| Hordeum stenostachys Godr. | | a | | Hordeum stenostachys Godr. | | 19328 | |
| Hordeum turkestanicum Nevski | Hordeum brevisubulatum (Trin.) Link subsp. turkestanicum Tzvelev | | | Hordeum turkestanicum Nevski | Hordeum brevisubulatum (Trin.) Link subsp. turkestanicum Tzvelev | 19331 | 102937 |
| Hordeum violaceum Boiss. & Hohen. | Hordeum brevisubulatum (Trin.) Link subsp. violaceum (Boiss. & Hohen.) Tzvelev | | | Hordeum violaceum Boiss. & Hohen. | Hordeum brevisubulatum (Trin.) Link subsp. violaceum (Boiss. & Hohen.) Tzvelev | 19332 | 102938 |
| Hordeum arizonicum Covas | | a | | Hordeum arizonicum Covas | | 102504 | |
| Hordeum californicum Covas & Stebbins | Hordeum brachyantherum Nevski subsp. californicum (Covas & Stebbins) Bothmer et al. | | | Hordeum californicum Covas & Stebbins | Hordeum brachyantherum Nevski subsp. californicum (Covas & Stebbins) Bothmer et al. | 102505 | 317469 |
| Hordeum capense Thunb. | | a | | Hordeum capense Thunb. | | 102506 | |
| Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | | a | i | Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell. | | 102508 | |
| Hordeum boreale Scribn. & J. G. Sm. | Hordeum brachyantherum Nevski subsp. brachyantherum | | | Hordeum boreale Scribn. & J. G. Sm. | Hordeum brachyantherum Nevski subsp. brachyantherum | 102509 | 317468 |
| Hordeum pratense Huds. | Hordeum secalinum Schreb. | | | Hordeum pratense Huds. | Hordeum secalinum Schreb. | 102515 | 19324 |
| Hordeum euclaston Steud. | | a | | Hordeum euclaston Steud. | | 102922 | |
| Hordeum pubiflorum Hook. f. | | a | | Hordeum pubiflorum Hook. f. | | 102924 | |
| Hordeum tetraploidum Covas | | a | | Hordeum tetraploidum Covas | | 102925 | |
| Hordeum sibiricum Roshev. | Hordeum roshevitzii Bowden | | | Hordeum sibiricum Roshev. | Hordeum roshevitzii Bowden | 102930 | 102931 |
| Hordeum roshevitzii Bowden | | a | | Hordeum roshevitzii Bowden | | 102931 | |
| Hordeum nevskianum Bowden | Hordeum brevisubulatum (Trin.) Link subsp. nevskianum (Bowden) Tzvelev | | | Hordeum nevskianum Bowden | Hordeum brevisubulatum (Trin.) Link subsp. nevskianum (Bowden) Tzvelev | 102935 | 102936 |
| Hordeum brevisubulatum (Trin.) Link subsp. nevskianum (Bowden) Tzvelev | | a | i | Hordeum brevisubulatum (Trin.) Link subsp. nevskianum (Bowden) Tzvelev | | 102936 | |
| Hordeum brevisubulatum (Trin.) Link subsp. turkestanicum Tzvelev | | a | i | Hordeum brevisubulatum (Trin.) Link subsp. turkestanicum Tzvelev | | 102937 | |
| Hordeum brevisubulatum (Trin.) Link subsp. violaceum (Boiss. & Hohen.) Tzvelev | | a | i | Hordeum brevisubulatum (Trin.) Link subsp. violaceum (Boiss. & Hohen.) Tzvelev | | 102938 | |
| Hordeum marinum Huds. subsp. marinum | | a | i | Hordeum marinum Huds. subsp. marinum | | 317386 | |
| Hordeum guatemalense Bothmer et al. | | a | | Hordeum guatemalense Bothmer et al. | | 317387 | |
| Hordeum patagonicum (Hauman) Covas | | a | | Hordeum patagonicum (Hauman) Covas | | 317388 | |
| Hordeum patagonicum (Hauman) Covas subsp. patagonicum | | a | i | Hordeum patagonicum (Hauman) Covas subsp. patagonicum | | 317389 | |
| Hordeum patagonicum (Hauman) Covas subsp. mustersii (Nicora) Bothmer et al. | | a | i | Hordeum patagonicum (Hauman) Covas subsp. mustersii (Nicora) Bothmer et al. | | 317390 | |
| Hordeum patagonicum (Hauman) Covas subsp. magellanicum (Parodi & Nicora) Bothmer et al. | | a | i | Hordeum patagonicum (Hauman) Covas subsp. magellanicum (Parodi & Nicora) Bothmer et al. | | 317391 | |
| Hordeum patagonicum (Hauman) Covas subsp. setifolium (Parodi & Nicora) Bothmer et al. | | a | i | Hordeum patagonicum (Hauman) Covas subsp. setifolium (Parodi & Nicora) Bothmer et al. | | 317392 | |
| Hordeum patagonicum (Hauman) Covas subsp. santacrucense (Parodi & Nicora) Bothmer et al. | | a | i | Hordeum patagonicum (Hauman) Covas subsp. santacrucense (Parodi & Nicora) Bothmer et al. | | 317393 | |
| Hordeum fuegianum Bothmer et al. | | a | | Hordeum fuegianum Bothmer et al. | | 317394 | |
| Hordeum cordobense Bothmer et al. | | a | | Hordeum cordobense Bothmer et al. | | 317395 | |
| Hordeum flexuosum Nees | | a | | Hordeum flexuosum Nees | | 317396 | |
| Hordeum intercedens Nevski | | a | | Hordeum intercedens Nevski | | 317397 | |
| Hordeum erectifolium Bothmer et al. | | a | | Hordeum erectifolium Bothmer et al. | | 317398 | |
| Hordeum brevisubulatum (Trin.) Link subsp. brevisubulatum | | a | i | Hordeum brevisubulatum (Trin.) Link subsp. brevisubulatum | | 317399 | |
| Hordeum brevisubulatum (Trin.) Link subsp. iranicum Bothmer | | a | i | Hordeum brevisubulatum (Trin.) Link subsp. iranicum Bothmer | | 317400 | |
| Hordeum compressum auct. | Hordeum cordobense Bothmer et al. | | | Hordeum compressum auct. | Hordeum cordobense Bothmer et al. | 317415 | 317395 |
| Hordeum nodosum L. var. depressum Scribn. & J. G. Sm. | Hordeum depressum (Scribn. & J. G. Sm.) Rydb. | | i | Hordeum nodosum L. var.depressum Scribn. & J. G. Sm. | Hordeum depressum (Scribn. & J. G. Sm.) Rydb. | 317416 | 19281 |
| Hordeum chilense Roem. & Schult. var. magellanicum Parodi & Nicora | Hordeum patagonicum (Hauman) Covas subsp. magellanicum (Parodi & Nicora) Bothmer et al. | | i | Hordeum chilense Roem. & Schult. var.magellanicum Parodi & Nicora | Hordeum patagonicum (Hauman) Covas subsp. magellanicum (Parodi & Nicora) Bothmer et al. | 317418 | 317391 |
| Hordeum mustersii Nicora | Hordeum patagonicum (Hauman) Covas subsp. mustersii (Nicora) Bothmer et al. | | | Hordeum mustersii Nicora | Hordeum patagonicum (Hauman) Covas subsp. mustersii (Nicora) Bothmer et al. | 317419 | 317390 |
| Hordeum maritimum With. var. patagonicum Hauman | Hordeum patagonicum (Hauman) Covas subsp. patagonicum | | i | Hordeum maritimum With. var.patagonicum Hauman | Hordeum patagonicum (Hauman) Covas subsp. patagonicum | 317420 | 317389 |
| Hordeum santacrucense Parodi & Nicora | Hordeum patagonicum (Hauman) Covas subsp. santacrucense (Parodi & Nicora) Bothmer et al. | | | Hordeum santacrucense Parodi & Nicora | Hordeum patagonicum (Hauman) Covas subsp. santacrucense (Parodi & Nicora) Bothmer et al. | 317421 | 317393 |
| Hordeum setifolium Parodi & Nicora | Hordeum patagonicum (Hauman) Covas subsp. setifolium (Parodi & Nicora) Bothmer et al. | | | Hordeum setifolium Parodi & Nicora | Hordeum patagonicum (Hauman) Covas subsp. setifolium (Parodi & Nicora) Bothmer et al. | 317422 | 317392 |
| Hordeum brachyantherum Nevski subsp. brachyantherum | | a | i | Hordeum brachyantherum Nevski subsp. brachyantherum | | 317468 | |
| Hordeum brachyantherum Nevski subsp. californicum (Covas & Stebbins) Bothmer et al. | | a | i | Hordeum brachyantherum Nevski subsp. californicum (Covas & Stebbins) Bothmer et al. | | 317469 | |
| Hordeum pubiflorum Hook. f. subsp. halophilum (Griseb.) Baden & Bothmer | | a | i | Hordeum pubiflorum Hook. f. subsp. halophilum (Griseb.) Baden & Bothmer | | 418599 | |
| Hordeum pubiflorum Hook. f. subsp. pubiflorum | | a | i | Hordeum pubiflorum Hook. f. subsp. pubiflorum | | 418600 | |
| Hordeum pubiflorum Hook. f. subsp. breviaristatum (Parodi & Nicora) Baden | | a | i | Hordeum pubiflorum Hook. f. subsp. breviaristatum (Parodi & Nicora) Baden | | 418601 | |
| Hordeum innermongolicum P. C. Kuo & L. B. Cai | | a | | Hordeum innermongolicum P. C. Kuo & L. B. Cai | | 454251 | |
| Hordeum halophilum Griseb. var. breviaristatum Parodi & Nicora | Hordeum pubiflorum Hook. f. subsp. breviaristatum (Parodi & Nicora) Baden | | i | Hordeum halophilum Griseb. var.breviaristatum Parodi & Nicora | Hordeum pubiflorum Hook. f. subsp. breviaristatum (Parodi & Nicora) Baden | 454252 | 418601 |
| Hordeum jubatum L. subsp. jubatum | | a | i | Hordeum jubatum L. subsp. jubatum | | 460171 | |
| Hordeum jubatum L. subsp. intermedium Bowden | | a | i | Hordeum jubatum L. subsp. intermedium Bowden | | 460172 | |
| Hordeum chilense Roem. & Schult. var. chilense | Hordeum chilense Roem. & Schult. | | i | Hordeum chilense Roem. & Schult. var.chilense | Hordeum chilense Roem. & Schult. | 484416 | 19272 |
| Hordeum halophilum Griseb. var. halophilum | Hordeum pubiflorum Hook. f. subsp. halophilum (Griseb.) Baden & Bothmer | | i | Hordeum halophilum Griseb. var.halophilum | Hordeum pubiflorum Hook. f. subsp. halophilum (Griseb.) Baden & Bothmer | 484419 | 418599 |
| Hordeum jubatum L. var. jubatum | Hordeum jubatum L. | | i | Hordeum jubatum L. var.jubatum | Hordeum jubatum L. | 484421 | 19308 |
| Hordeum maritimum With. var. maritimum | Hordeum marinum Huds. subsp. marinum | | i | Hordeum maritimum With. var.maritimum | Hordeum marinum Huds. subsp. marinum | 484423 | 317386 |
| Hordeum secalinum Schreb. var. secalinum | Hordeum secalinum Schreb. | | i | Hordeum secalinum Schreb. var.secalinum | Hordeum secalinum Schreb. | 484426 | 19324 |