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Prickly Hawkweed
Hieracium horridum
About Prickly Hawkweed (Hieracium horridum) 0 Nurseries Carry This Plant Hieracium horridum, known as the prickly hawkweed or shaggy hawkweed, gets its name from the long, dense, shaggy white to brown hairs (trichomes) which cover all of the plant parts of this plant species. The species is native to Oregon, California, and Nevada in the western United States. Hieracium 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 flower heads at the top of each flower head, which is 0. 315 inches (8 mm) to 0. 354 inches (9 mm) in diameter. It flowers between late June and August. Hieracium horridum's habitat is in dry rocky places within mountainous coniferous forests in Oregon, California and Nevada at elevations between 5,000 feet (1,524 m) and 12,000 feet (3,658 m).
Plant Description
Plant Type
Plant Type
Perennial herb

4 in tall

Flower Color
Flower Color

Wildlife Supported

Butterflies & moths hosted ( 2 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Annual Precipitation: 13.1" - 107.6", Summer Precipitation: 0.24" - 3.85", Coldest Month: 10.8" - 53.0", Hottest Month: 34.1" - 79.3", Humidity: 0.69" - 22.13", Elevation: 1869" - 14090"

Alternative Names
Common Names: Shaggy Hawkweed

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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