Pilosella albiflora

Short description: Species of flowering plant in the daisy family Asteraceae

Pilosella albiflora

Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Clade:  | Angiosperms
Clade:  | Eudicots
Clade:  | Asterids
Order:  | Asterales
Family:  | Asteraceae
Genus:  | Pilosella
Species:  |

P. albiflora

Binomial name
Pilosella albiflora

(Hook.) F.W.Schultz & Sch.Bip.

Synonyms[1]

* Arv.-Touv. (Hook.) W.A.Weber
* Hieracium albiflorum Chlorocrepis albiflora
* Hook. Hieracium vancouverianum

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

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 (Hook.) F.W.Schultz & Sch.Bip.", Plants of the World Online (Royal Botanic Gardens, Kew), http://www.plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:237973-1, retrieved 2020-09-24
2. ↑ Gary A. Monroe (2000). "Hieracium albiflorum". Fire Effects Information System. USDA Forest Service. http://www.fs.fed.us/database/feis/plants/forb/hiealb/all.html. Retrieved 2007-12-15.
3. ↑ http://bonap.net/MapGallery/County/Hieracium albiflorum.png [bare URL image file]
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.

## External links

* Jepson Flora Project Hieracium albiflorum
* Calphotos photo gallery, University of California
* Turner Photographics, Hieracium albiflorum \- Wildflowers of the Pacific Northwest

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