| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Poaceae | Diarrhena americana | Eastern Beakgrain | Rich moist forests, usually over calcareous rocks. | W. Virginia and West Virginia west to Indiana, south to Tennessee, sw. North Carolina, and nw. Georgia (Jones & Coile 1988); disjunct west of the Mississippi in Missouri, Arkansas, and Oklahoma. |  (c) Fleming, Gary P. |
| Poaceae | Diarrhena obovata | Western Beakgrain | Alluvial forests, other moist forests. | Sw. Pennsylvania and Indiana west to South Dakota, Kansas, south to w. Virginia, c. Tennessee, and ne. Texas. First reported for Virginia by Fleming & Ludwig (1996). The floodplain of the Potomac River (in Fairfax County, Virginia) has a number of disjuncts of species with more midwestern affinities, including Diarrhena obovata, Erigenia bulbosa, Valeriana pauciflora, and Erythronium albidum (Fleming & Ludwig 1996). |  (c) Marcum, Paul |