| Currently Accepted Name: | Elymus riparius Wiegand - Determined By: J.J.N. Campbell, 2015 |
| Locality: | United States. Kentucky. Rockcastle: sandy alluvial floodplain. Associates: Phlox maculata- Passiflora lutea- Agrimonia rostellata- Lindera benzoin- Elymus virginicus- Calystegia sepium- Platanus occidentalis. |
| Habitat: | Rockcastle County: Rockcastle River alluvial floodplain and gravel bars- ca. 2.2 miles west of US 25 west of KY 1329- north bank. Frequent; |