|Alpine Lakes Wilderness, Washington|
Arnica parryi is a North American species of arnica known by the common name Parry's arnica or nodding arnica. It is native to western Canada (Yukon, British Columbia, Alberta) and the western United States as far south as Inyo County, California and McKinley County, New Mexico. It grows in temperate coniferous forests and alpine meadows in mountainous areas, primarily the Rocky Mountains, Cascades, and Sierra Nevada.
Arnica parryi is a rhizomatous perennial herb producing a single unbranched stem to heights between 10 and 60 centimeters. There are oval-shaped leaves around the base of the stem and a few pairs of longer, narrower petioled leaves above them. The leaves may approach 20 centimeters in length on larger individuals.
The inflorescence holds one to several daisylike flower heads, which nod as buds and then pull erect when the face opens. Each head has a center filled with yellow disc florets and usually several yellow ray florets around the edge. The fruit is a cylindrical achene about half a centimeter long with a bristly pappus.
- The International Plant Names Index
- The Plant List Arnica parryi A.Gray
- Calflora taxon report, University of California, Arnica parryi, A. Gray, Parry's arnica, nodding arnica
- Biota of North America Program 2014 county distribution map
- Flora of North America Vol. 21 Page 373 Parry’s arnica, nodding arnica Arnica parryi A. Gray, Amer. Naturalist. 8: 213. 1874.
Media related to Arnica parryi at Wikimedia Commons
- Jepson Manual Treatment
- united States Department of Agriculture Plants Profile
- Callphotos Photo gallery, University of California
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