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Ageratina occidentalis
Also called Western Eupatorium, Western Joepyeweed
Ageratina occidentalis is a species of flowering plant in the family Asteraceae known by the common name western snakeroot or western eupatorium. It is native to the western United States where it grows in several types of habitat. It is found in California, Oregon, Washington, Idaho, Montana, Nevada, and Utah.
Ageratina occidentalis is a rhizomatous perennial herb growing fuzzy green or purple stems to a maximum height near 70 centimeters. Its leaves are glandular and triangular, with serrated edges. The inflorescence is a dense cluster of fuzzy flower heads containing long, protruding disc florets in shades of white, pink, and blue. There are no ray florets. The fruit is an achene a few millimeters long with a rough, bristly pappus.
Sticky snakeroot · White snakeroot · Lesser snakeroot · Ageratina concordiana · Ageratina crassiramea · Ageratina cuencana · Ageratina glabrata · Ageratina gracilis · Havana snakeroot · Fragrant snakeroot · Hammock snakeroot · Lemmon's snakeroot
Text excerpted from the Wikipedia article Ageratina occidentalis by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
