| calamagrostis howellii | | USA: Washington, Skamansa Co., along the Columbia River in drier areas of cliffs at Cape Horn, at E end of railroad tunnel, 8 Jul 1966, R. & M. Spellenberg & D. Sutherland 1189 (CAN-302143) | | 227346743 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1254553389 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1253618185 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1253617371 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1253616936 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1253616640 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1253616319 |
| calamagrostis howellii | | USA: Washington, Skamania Co., along the Columbia River | | 1253615531 |