Arnica sororia

Arnica sororia is a North American species of flowering plant known by the common name twin arnica.[1] It is native to Western Canada (British Columbia, Alberta, Saskatchewan) and the Western United States (Washington, Oregon, California, Nevada, Utah, Idaho, Montana, Wyoming, South Dakota).[2] It grows in grasslands and in conifer forests,[3] as well as the sagebrush steppe.[4]

Arnica sororia
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Arnica
Species:
A. sororia
Binomial name
Arnica sororia

Arnica sororia is a rhizomatous perennial herb producing one or more hairy, glandular stems 10 to 50 centimeters (4 to 19+1⁄2 in) tall. There are a few to several pairs of broadly lance-shaped leaves along the stem,[4] the lower ones borne on petioles. Leaves may reach up to 14 cm long.[5]

The inflorescence consists of a daisy-like flower head, rarely more than one per stem.[4] These are lined with phyllaries coated in glandular hairs. The flower head has a center of glandular yellow disc florets and a fringe of yellow ray florets. The fruit is an achene a few millimeters long with a white pappus.[5]

References
  1. Calflora taxon report, University of California, Arnica sororia E. Greene, twin arnica
  2. Biota of North America Program 2014 county distribution map
  3. Flora of North America Vol. 21 Page 370 Twin arnica Arnica sororia Greene
  4. Taylor, Ronald J. (1994) [1992]. Sagebrush Country: A Wildflower Sanctuary (rev. ed.). Missoula, MT: Mountain Press Pub. Co. p. 158. ISBN 0-87842-280-3. OCLC 25708726.
  5. Greene, Edward Lee 1910. Ottawa Naturalist 23(12): 213
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.