Regularity: Regularly occurring
Global Range: Central WA, ID, and w. MT, south to CA and UT. Peripheral.
This species could be confused with BRICKELLIA GRANDIFLORA or SAUSSUREA AMERICANA, but both of these have involucral bracts in many rows of different lengths.
Catalog Number: US 542436
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. F. Macbride
Year Collected: 1910
Locality: Fall Creek, Elmore County., Elmore, Idaho, United States, North America
Elevation (m): 1372
- Isotype: Nelson, A. 1912. Bot. Gaz. 53 (3): 226.
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
Ageratina occidentalis is a species of flowering plant in the daisy family 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. This is a rhizomatous perennial herb growing fuzzy green or purple stems to a maximum height near 70 centimeters. The glandular leaves are triangular in shape 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.
- Stevenson, Matilda Coxe 1915 Ethnobotany of the Zuni Indians. SI-BAE Annual Report #30 (p. 50)
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