External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:246713-1
- Publication
- Flora of the Rocky Mountains . . .
- Collation
- 998
- Family as entered in IPNI
- Asteraceae
Original Data
- Remarks
- S. hydrophilus, var. pacificus, Greene