- 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.
- Stone, Katharine R. 2011. Hieracium caespitosum. Fire Effects Information System, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory
- King County Department of Natural Resources and Parks Water and Land Resources Division
- Washington State Noxious Weed Control Board
- Flora of North America, www.eFloras.org
- USDA NRCS PLANTS
- USDA ARS GRIN