Pumilum6
- Cirsium pumilum var. (wikipedia.org)
- Flora of North America, Hill's thistle, Cirsium pumilum (Nuttall) Sprengel var. (wikipedia.org)
- Cirsium pumilum (Nutt. (usf.edu)
- Cirsium hillii (Canby) Fernald Cirsium pumilum subsp. (floranorthamerica.org)
- Flowers of Cirsium pumilum are reportedly sweetly scented. (floranorthamerica.org)
- hillii , Cirsium pumilum var. (floranorthamerica.org)
Canby3
- Population viability assessment for Hill's thistle (Cirsium hillii (Canby) Fernald) (PDF). (wikipedia.org)
- hillii (Canby) B. Boivin Biota of North America Program 2014 county distribution map, Cirsium hillii Higman, P.J. (wikipedia.org)
- Endemic Basionym: Cnicus hillii Canby Gard. (floranorthamerica.org)
Species1
- Hill's thistle is an endemic species to North America, found only in Canada and the United States. (wikipedia.org)
Type1
- hillii is a type of thistle endemic to North America. (wikipedia.org)