Interim profile, incomplete information
Taxonomic name: Hieracium aurantiacum L.
Synonyms: Pilosella aurantiaca (L.) F. W. Schultz & Sch. Bip.
Common names: devil's weed, devil's-paintbrush, épervière orangée (French), fox-and-cubs, grim-the-collier, king-devil, orange hawkweed, orange paintbrush, red daisy flameweed
Organism type: herb
Orange hawkweed, Hieracium aurantiacum is a perennial herb native to Europe. It has distinctive orange flowers which appear over summer until early autumn and produce tiny black seeds. H. aurantiacum can also spread vegetatively via stolons. The ability ofH. aurantiacum to grow in a range of conditions - it is both snow and frost tolerant, and can grow in gravelly and acidic soils, full sun through to part shade and semi-arid through to humid environments - increases its invasiveness. H. aurantiacum has been known to invade disturbed ecosystems, roadsides, grasslands, pastures, open forests, alpine meadows and other mountain habitats. H. aurantiacum has been described as a 'sleeper weed' in Australia, i.e., a weed that spreads significantly and grows significantly in population many years (usually 50+ years) after naturalisation.
natural forests, range/grasslands, ruderal/disturbed
Native range: Europe (USDA-ARS, 2010)
Known introduced range: Temperate regions
Introduction pathways to new locations
For ornamental purposes:
Other: Garden escape/garden waste
Local dispersal methods
For ornamental purposes (local):
Garden escape/garden waste:
Other (local): Spread vegetatively via stolons (short distances).
Hieracium aurantiacum is considered a weed in Australia, the United States, Canada and New Zealand. It is thought that early detection and eradication is the most effective method for preventing H. aurantiacum from spreading into new areas. Control can be relatively simple if planned correctly, as H. aurantiacum can spread easily via seeds and stolons. H. aurantiacum can be managed using chemical methods, i.e. the application of herbicide (in spring for best results) followed by no mowing or slashing for at least two weeks. Plants can also be carefully dug out, ensuring no roots or runnners are left behind - H. aurantiacum can quickly regrow from fragments. (Beaumont et al. 2009a; CRC 2003).
Compiled by: IUCN SSC Invasive Species Specialist Group (ISSG) with support from the Overseas Territories Environmental Programme (OTEP) project XOT603, a joint project with the Cayman Islands Government - Department of Environment
Last Modified: Friday, 24 September 2010