Hieracium horridum
From Wikipedia, the free encyclopedia
| Hieracium horridum | ||||||||||||||
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| Hieracium horridum Fries[1] |
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 Hieracium horridum distribution
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Pilosella horrida (Fr.) F.W. Schultz & Sch. Bip.[2] |
Hieracium horridum,[4] known as the Prickly Hawkweed[1] or Shaggy Hawkweed, gets its name from the long, dense, shaggy white to brown hairs (trichomes) which cover all of the plant parts[2] of this native western North American perennial plant.[5]
H. horridum 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 flowers at the top[2] of each flower head, which is .315 inches (8 mm) to .354 inches (9 mm) in diameter.[6] It flowers between late June and August.
Like all members of the Asteraceae family, the flowers are actually florets comprised of many ray corolla, each ray its own stamen. The stems and leaves produce a milky substance when broken.[7]
[edit] Distribution
Hieracium horridum's habitat is in dry rocky places within mountainous coniferous forests[4] in Oregon, California and Nevada[1][5] at elevations between 5,000 feet (1,524 m) and 12,000 feet (3,658 m).[2]
[edit] References
- ^ a b c Natural Resources Conservation Service (2007). PLANTS Profile for Hieracium horridum Fr. prickly hawkweed (HTML). The PLANTS Database. USDA, Baton Rouge, LA 70874-4490 USA.. Retrieved on 2007-12-26.
- ^ a b c d Missouri Botanical Garden (2007). Tropios beta: details for Hieracium horridum Fr. (HTML). Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110. Retrieved on 2007-12-26.
- ^ International Plant Names Index. Plant Name Details Hieracium horridum (HTML). Retrieved on 2007-12-26.
- ^ a b Charters, Michael L.. Shaggy Hawkweed (HTML). Wildflowers and Other Plants of Southern California. Retrieved on 2007-12-26.
- ^ a b Germplasm Resources Information Network. Taxon: Hieracium horridum Fr. (HTML). (GRIN) Online Database. USDA, ARS, National Genetic Resources Program. Retrieved on 2007-12-26.
- ^ Flora of North America. "Hieracium horridum Fries, Uppsala Univ. Årsskr. 1862". Flora of North America North of Mexico Volumes 19, 20 and 21: pages 278, 283, 292. New York and Oxford: Flora of North America Association.
- ^ Hieracium (HTML) (2007). Retrieved on 2007-12-26.
[edit] External links
- Integrated Taxonomic Information System (ITIS). Standard Report Hieracium horridum Fries (HTML). Retrieved on 2007-12-26.
- Bayerische botanische Gesellschaft, Regensburg; Jena : G. Fischer [etc.] (1862). Flora oder Allgemeine botanische Zeitung (HTML), 45, 4344 Shaw Boulevard - Saint Louis, Missouri 63110: Missouri Botanical Garden. QK1.F418. Retrieved on 2007-12-26.
- The Flora of the Pine Belt of the San Antonio Mountains of Southern California (HTML). Plant World (1919 Reprinted with Editing 2003-2005). Retrieved on 2007-12-26.
- Plant Guide to Devils Slide Trail, San Jacinto Mountains (HTML). Flora of San Jacinto Mountain (2002-2007). Retrieved on 2007-12-26. “This is a working list, about which we make no guarantees at all until we officially release it. Use at your own risk!”
- Sierra Nevada Field Campus, San Francisco State University. FLORA (HTML). Preliminary list of species within a 60 mile radius of Sierra Nevada Field Campus.. Retrieved on 2007-12-26.
- Grossi, Mark (September 2000). "Longstreet Highroad Guide to the California Sierra Nevada", California Sierra Nevada Book:Devils Postpile National Monument (HTML), Decatur, GA: Lenz Design, Rainbow Falls. ISBN 1-56352-592-5. Retrieved on 2007-12-26.
