Orange Hawkweed (Hieracium aurantiacum)

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Stems are erect, usually leafless, and covered with bristly hairs. They grow 15 to 90 cm tall and contain a milky sap. There may be one to several stems per plant. Leaves are mostly basal, elliptical,

covered with bristly hairs, and is 10 to 15 cm long. Any stems leaves are much smaller. Flowers are composed of ray flowers with square edged, notched petals. The orange-red flowers are borne in clusters of 5 to 30 heads at the ends of stems. The involucres (base of the flower) have long bristly hairs and blackish glands. This is the only hawkweed, native or introduced, to have orange flowers.
Key Identifiers
  • Orange flowers, with square edges than are notched
  • Leaves, stems and buds covered in bristly hairs
  • At flowering produces rhizomes and/or stolons
  • Milky sap
Location in Canada
All Canadian provinces are thought to have orange hawkweed, BC east to Nfld. Populations are being reported in Clearwater, Wetaskiwin, Leduc, Yellowhead and Woodland Counties within the province of Alberta.

Resources Similar species
Native Hawkweeds (Hieracium sp) Many native hawkweeds are in North America but none will produce stolons and their flowers are yellow or white.

Nicole Kimmel, ARD
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This document is maintained by Stacey Tames.
This information published to the web on June 27, 2012.
Last Reviewed/Revised on August 21, 2018.