Pilosella albiflora

Pilosella albiflora (synonym Hieracium albiflorum) is a common and widespread North American plant in the sunflower family, known by the names white hawkweed and white-flowered hawkweed.

Pilosella albiflora
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Tribe: Cichorieae
Genus: Pilosella
Species:
P. albiflora
Binomial name
Pilosella albiflora
F.W.Schultz & Sch.Bip.
Synonyms[1]
  • Chlorocrepis albiflora (Hook.) W.A.Weber
  • Hieracium albiflorum Hook.
  • Hieracium vancouverianum Arv.-Touv.

Pilosella albiflora grows in western North America, from Alaska and Northwest Territories south as far as Chihuahua, Sonora) and east to Manitoba and the Black Hills of South Dakota. There have been reports of populations in Québec and Wisconsin, but these are probably waifs or introductions.[2][3][4][5]

Pilosella albiflora is found in forests and woodlands at low to moderate elevation. It is similar its relative the common dandelion, except for having more than one flower head per plant, sometimes 50 or more in a flat-topped array. Each head has 6-25 white (rather than yellow as in most related species) ray flowers but no disc flowers.[6]

References
  1. "Pilosella albiflora F.W.Schultz & Sch.Bip.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2019-01-28
  2. Gary A. Monroe (2000). "Hieracium albiflorum". Fire Effects Information System. USDA Forest Service. Retrieved 2007-12-15.
  3. http://bonap.net/MapGallery/County/Hieracium%20albiflorum.png
  4. Biota of North America Program 2014 county distribution map
  5. Biota of North America Program 2014 state-level distribution map
  6. Flora of North America, Hieracium albiflorum Hooker, 1833.


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