- 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 
Washington State Noxious Weed Control Board 
University of California, Jepson Flora Project 
Flora of North America, www.eFloras.org 
CABI Invasive Species Compendium 
Oregon Department of Agriculture 
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org