Pilosella horrida

Pilosella horrida (synonym Hieracium horridum),[1] known as the prickly hawkweed[2] or shaggy hawkweed, gets its name from the long, dense, shaggy white to brown hairs (trichomes) which cover all of the plant parts[3] of this plant species.[4] The species is native to Oregon, California, and Nevada in the western United States.[5][6]

Pilosella horrida
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Tribe: Cichorieae
Genus: Pilosella
Species:
P. horrida
Binomial name
Pilosella horrida
F.W.Schultz & Sch.Bip.[1]
Synonyms[1]
  • Hieracium breweri A.Gray
  • Hieracium horridum Fr.

Pilosella horrida possesses oblong leaves along the stems of this 4 inches (10 cm) to 15 inches (38 cm) tall hairy plant with 11-12 bright yellow flower heads at the top[3] of each flower head, which is 0.315 inches (8 mm) to 0.354 inches (9 mm) in diameter.[7] It flowers between late June and August.

Like all members of the family Asteraceae, the flowers are actually florets made up of many ray corolla, each ray its own stamen. As with other plants of the tribe Cichorieae, the stems and leaves produce a milky substance when broken.[8]

Name

The epithet horridum means 'bristly' in reference to its hairy leaves.[9]

Distribution

Pilosella horrida's habitat is in dry rocky places within mountainous coniferous forests[10] in Oregon, California and Nevada[2][4] at elevations between 5,000 feet (1,524 m) and 12,000 feet (3,658 m).[3]

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References
  1. "Pilosella horrida F.W.Schultz & Sch.Bip.". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-01-28.
  2. Natural Resources Conservation Service (2007). "PLANTS Profile for Hieracium horridum Fr. prickly hawkweed". The PLANTS Database. USDA, Baton Rouge, LA 70874-4490 USA. Retrieved 2007-12-26.
  3. Niehaus, Theodore F. (1976). "Pacific States Wildflowers". Peterson Field Guide. The Peterson Field Guide Series. Illustrations by Charles L. Ripper. New York: Houghton Mifflin Company. p. 220. ISBN 0-395-91095-1.
  4. "Pilosella horrida". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2007-12-26.
  5. Calflora taxon report, University of California, Hieracium horridum Fries Shaggy Hawkweed, prickly hawkweed
  6. Biota of North America Program 2014 county distribution map
  7. Flora of North America. "Hieracium horridum Fries, Uppsala Univ. Årsskr. 1862". Flora of North America North of Mexico. New York and Oxford: Flora of North America Association. 19, 20 and 21: 278, 283, 292. Retrieved 2007-12-26.
  8. Mrs M. Grieve (1933). "Hawkweed, Wood". A Modern Herbal. botanical.com. Retrieved 2007-12-16.
  9. Blackwell, Laird R. (2006). Great Basin Wildflowers: A Guide to Common Wildflowers of the High Deserts of Nevada, Utah, and Oregon (A Falcon Guide) (1st ed.). Guilford, Conn.: Morris Book Publishing, LLC. p. 124. ISBN 0-7627-3805-7. OCLC 61461560.CS1 maint: date and year (link)
  10. Charters, Michael L. "Shaggy Hawkweed". Wildflowers and Other Plants of Southern California. Retrieved 2007-12-26.
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