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Pilosella aurantiaca
From Wikipedia, the free encyclopedia
| Pilosella aurantiaca | ||||||||||||||
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| Pilosella aurantiaca (L.) F.W.Schultz & Schultz-Bip. |
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Hieracium aurantiacum L. |
Pilosella aurantiaca (Fox-and-cubs, Orange Hawkweed, Tawny Hawkweed, Devil's Paintbrush, Grim-the-collier) is a flowering plant of the family Asteraceae native to alpine regions of central and southern Europe, where it is protected in several regions.
It is a low-growing plant with shallow fibrous roots and a basal rosette of elliptical to lanceolate leaves 5–20 cm long and 1–3 cm broad [1]. The flowering stem is usually leafless or with just one or two small leaves. The stem and leaves are covered with short stiff hairs (trichomes), usually blackish in colour. The stems may reach a height of 60 cm and have 2–25 capitula (flowerheads), each 1–2½ cm diameter, bundled together at the end of short pedicels. All parts of the plant exude a milky juice.
The plants propagates through its wind-dispersed seeds, and also vegetatively by stolons and shallow rhizomes.
P. aurantiaca is widely grown as an ornamental plant in gardens for its very decorative flowers. It has been introduced into Australasia and North America and escaped from gardens and is considered an invasive species in some areas. It is found across Canada and the north of the U.S., reaching more in the south on the coasts. The plant is easily removed (until it seeds back) by ploughing or salting. It is on the noxious weeds and/or quarantine lists of Colorado [2], Idaho [3], Montana [4][1], Oregon [5], Washington [6] and regions of British Columbia [7], with cultivation usually prohibited. In Alberta, it is not considered a noxious weed except locally [8]. In Australia, the plant is considered a noxious weed in Tasmania and it is quarantined from the country [9]. In New Zealand, the plant is closely watched [10] and attempts at control are made.
- ^ Blanchan, Neltje (2005). Wild Flowers Worth Knowing. Project Gutenberg Literary Archive Foundation.
- ^ Colorado Noxious Weeds ID Guide.
- ^ Robert H. Callihan & Timothy W. Miller (2004). Idaho's Noxious Weeds – Orange Hawkweed. The Idaho Association of Soil Conservation Districts.
- ^ Montana's Statewide Noxious Weed Awareness and Education Campaign. Weed list.
- ^ Noxious Weed List by common name. Oregon Department of Agriculture.
- ^ Orange hawkweed (Hieracium aurantiacum. Washington State Noxious Weed Control Board).
- ^ Field Guide to Noxious and Other Selected Weeds of British Columbia (2002). Orange Hawkweed (Hieracium aurantiacum). Ministry of Agriculture and Lands.
- ^ Alberta Invasive Plants Council. Orange Hawkweed: Hieracium aurantiacum. Government of Alberta.
- ^ Department of the Environment and Heritage and the CRC for Australian Weed Management (2003). Orange hawkweed (Hieracium aurantiacum). ISBN 1-920-93225-9.
- ^ Biosecurity New Zealand. Pests and Diseases List.