- Hieracium aurantiacum is a perennial plant that is 11.8-23.6 in. (30-60 cm) tall and produces a milky sap.
- Leaves are mostly basal, elliptical, 2-8 in. (5-20 cm) long, 0.4-1.2 in. (1-3 cm) wide and covered with short, stiff, black hairs. The stems can grow up to 12 in. (30.5 m) tall.
- Flowers appear in compact cluster of 5 or more dandelion-like flowers on short hairy stalks at the top of the plant. They are 0.75-1 in. (1.9-2.5 cm) across, orange to red, have square-edged petals and appear in May to June on leafless flower stalks.
- Fruit is a dark seed with a tuft of white hair to be carried in the wind. The plant can spread by seeds, stolons, and rhizomes.
- Ecological Threat
- Hieracium aurantiacum is usually found in sunny areas and occurs in disturbed areas such as roadsides, gravel pits, meadows, and pastures. It is native to Europe.
- Stone, Katharine R. 2010. Hieracium aurantiacum. In: Fire Effects Information System, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory
- Global Invasive Species Database. 2011. Invasive Species Specialist Group (ISSG) of the IUCN Species Survival Commission
- King County Department of Natural Resources and Parks Water and Land Resources Division
- Oregon Department of Agriculture Plant Programs, Noxious Weed Control
- Washington State Noxious Weed Control Board
- University of California, Jepson Flora Project
- Flora of North America, www.eFloras.org
- USDA NRCS PLANTS
- USDA ARS GRIN