Pilosella scouleri

Pilosella scouleri (synonym Hieracium scouleri[1]) is a North American species of flowering plant in the dandelion tribe within the sunflower family. It is known as Scouler's woollyweed. It is native to western North America, from British Columbia and Alberta in Canada, south to northern California and Utah in the United States.[2][3][4]

Pilosella scouleri
At the Dark Divide, Washington
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Tribe: Cichorieae
Genus: Pilosella
Species:
P. scouleri
Binomial name
Pilosella scouleri
F.W.Schultz & Sch.Bip.[1]
Synonyms[1]
  • Hieracium absonum J.F.Macbr. & Payson
  • Hieracium albertinum Farr
  • Hieracium chapacanum Zahn
  • Hieracium cusikii Gand.
  • Hieracium cynoglossoides Arv.-Touv.
  • Hieracium scouleri Hook.
  • Hieracium scouleri Hook. ex A.Gray

Pilosella scouleri grows in a variety of mountainous habitats. It produces a basal rosette of long, narrow leaves 10–20 centimetres (3.9–7.9 in) long, which are generally hairy to bristly. The plant produces an erect stem 30–70 centimetres (12–28 in) tall which bears the inflorescence. Each flower head has large, curling bracts with glandular hairs or bristles, long, bright yellow ray florets but no disc florets. The achene is about 3 millimetres (0.12 in) long.[5]

  • Flower heads has many bright yellow ray florets

References
  1. "Pilosella scouleri F.W.Schultz & Sch.Bip.". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-01-29.
  2. Biota of North America Program 2014 county distribution map
  3. Calflora taxon report, University of California, Hieracium scouleri Hook., Hounds tongue hawkweed, Houndstongue hawkweed, Scouler's hawkweed, Scouler's woollyweed
  4. Turner Photographics, Hieracium scouleri - Wildflowers of the Pacific Northwest photos, description, partial distribution map
  5. Flora of North America, Hieracium scouleri Hooker, 1833.


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