Senecio serra Hook.
Asteraceae
| Collection Number | C. Davidson 13889 |
| Collectors | C. Davidson, S. R. Christoph, Dave Weskamp (TNC) |
| Identified By | C. Davidson |
| Source | C. Davidson |
| Date | 31 July 2018 |
| Country | USA |
| state | Idaho |
| county | Fremont |
| Location | Henry's Fork of Snake River; Box Canyon, below Island Park Dam. Elev. 1880 m. |
| Lat/Long | N 44 23 28.1 W 111 24 05.1 |
| Note | Mixed conifers with lodgepole, Abies, Douglas fir. Moist riverbank. Stems 1-1.3 m. |