- Hieracium caespitosum is a perennial plant in the sunflower family. It grows from 1-3 ft. (0.3-0.9 m) tall and produces a milky sap when crushed.
- Leaves long and narrow, up to 6 in. (15.2 cm) long, somewhat hairy on both sides, and form a basal rosette. There are also one or two small leaves found on the stem.
- Flowers are yellow, dandelion-like, and develop in summer to fall. Flowers in bud are rounded and black in tight clusters on top of the stems.
- 25-30 seeds can be found on one fruit and have fine white bristles which aid in wind dispersal. The plant can spread by seed, stolon, and rhizome.
- Ecological Threat
- Hieracium caespitosum is native to Europe and occurs in fields, roadsides and sparse woodlands. It was first found in the United States in Washington in 1969.
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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
- Colorado Noxious Weeds
- Faith Campbell, 1998
- Great Lakes Early Detection Network
- Idaho Noxious Weeds
- Montana Noxious Weeds
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- 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.|