External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:30313607-2
- Publication
- Flora of North America, A (Torrey & Gray)
- Collation
- 2(3): 483
- Date of Publication
- Feb 1843
- Family as entered in IPNI
- Asteraceae