External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:239988-1
- Publication
- Proceedings of the American Academy of Arts and Sciences. Boston, MA
- Collation
- 8: 390
- Family as entered in IPNI
- Asteraceae
Original Data
- Remarks
- Am. bor. occ
Nomenclatural Notes
(non P. oregonus Nutt.)