Northern Prairie Wildlife Research Center


Home	About NPWRC	Our Science	Staff	Employment	Contacts	Common Questions	About the Site

Western Wetland Flora

Field Office Guide to Plant Species

Hairy Arnica
Arnica mollis Hook.

JPG -- Species Photo JPG -- Distribution Map

Family: Composite (Compositae)
Flowering: June-September
Field Marks: This species is recognized by its 3-4 pairs of hairy, opposite leaves, and its few yellow flower heads up to 2 1/2 inches across.
Habitat: Moist areas in the mountains, including spruce-pine forests.
Habit: Perennial herb with dark brown rhizomes.
Stems: Upright, unbranched, up to 2 feet tall, with short or long hairs, some of which may be glandular.
Leaves: Basal leaves oblanceolate to spatulate, borne on stalks; leaves on the stem in 3-4 opposite pairs, lanceolate to ovate, up to 3 inches long, sessile, usually rough-hairy, with or without teeth.
Flowers: Crowded together into a head, the head up to 2 1/2 inches across, some of the flowers yellow and ray-like surrounding a yellow disk; rays 12-18, 3/4-1 1/4 inches long; disk up to 1 1/2 inches across; each head subtended by several pointed, long-hairy bracts.
Sepals: 0.
Petals: Some united to form flat rays, others united to form short tubes.
Stamens: 5.
Pistils: Ovary inferior, hairy.
Fruits: Achenes up to 1/6 inch long, hairy, with a tuft of tawny-colored hairs at the tip.

Previous Species -- Seep Spring Arnica (Arnica longifolia)
Return to Species List -- Group 7
Next Species -- Texas Bergia (Bergia texana)

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/florawe/species/7/arnimoll.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:26:58 EST
Sioux Falls, SD [sdww54]