Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Michael Shephard, USDA Forest Service, Bugwood.org<br />
Orange Hawkweed<br />
Hieracium aurantiacum, Asteraceae (Sunflower Family)<br />
Category: Prohibited Noxious<br />
Michael Shephard, USDA Forest<br />
Service, Bugwood.org<br />
• Information: Introduced from Europe as an ornamental.<br />
• Life Cycle: Perennial.<br />
• Root: Shallow, fibrous, creeping.<br />
• Leaves: Rosette leaves are narrow, spatula-shaped, hairy, 10-15cm long,<br />
and darker green on the upper surface.<br />
• Stems: 30-90cm tall with bristly hairs and 0-3 small leaves. Entire plant<br />
contains a milky juice.<br />
www.ontariowildflower.com/alien_wildflower_meadow.htm#orange hawkweed<br />
• Flower: 5 to 30 flower heads form a compact, umbelliform inflorescence<br />
at stem apex. Flower heads have red-orange petals with notched tips.<br />
• Seed/Fruit: Dark brown or black with ridges and bristly plumes.<br />
http://www.invasiveplants.ab.ca/Downloads/FS-OrangeHawkweed.pdf<br />
25<br />
www.ontariowildflower.com/alien_wildflower_meadow.htm#orange hawkweed