- Hieracium pilosella is a perennial weed that can grow from 4-12 in. (10.2-30.5 cm) in height.
- Leaves are elliptic, rosette, 1-4 in. (2.5-10.2 cm) long, covered in long white hairs and have a white vein down the middle. Flower stalks are long, leafless, and covered in stiff dark hairs.
- Flowers are bright yellow, 1 in. (2.5 cm) across, and clustered in groups of at least 2 flowers. Flowers resemble that of dandelions. Flowering occurs from June to September.
- Fruits can be found purple to black, 0.08 in. (2 mm) long with off white hairs that are 0.2 in. (5 mm) long. The fruit are usually dispersed by the wind.
- Ecological Threat
- Hieracium pilosella does not tolerate shade and can be found in disturbed areas such as fields, waste areas, pastures, and roadsides. It is native to Europe.
Hieracium pilosella is a perennial herb, about 2.5 dm tall, arising from a very short rhizome with many fibrous roots.
Hieracium pilosella can be distinguished from other hawkweeds by its solitary yellow flowers, its hairs, rosette growth form, and its stoloniferous habit.
- Element Stewardship Abstract - The Nature Conservancy
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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
- Faith Campbell, 1998
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Montana Noxious Weeds
- New Jersey Department of Agriculture, Division of Plant Industry, 2004
- Oregon Noxious Weeds
- Pacific Northwest Exotic Pest Plant Council, 1998
- Washington Noxious Weeds
- WeedUS - Database of Plants Invading Natural Areas in the United States
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|