Ageratina occidentalis

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Ageratina occidentalis
Ageratina occidentalis - Regional Parks Botanic Garden, Berkeley, CA - DSC04254.JPG
Regional Parks Botanic Garden
Berkeley, California
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Eupatorieae
Genus: Ageratina
Species: A. occidentalis
Binomial name
Ageratina occidentalis
(Hook.) King & H.Rob.
  • Eupatorium occidentale Hook.
  • Eupatorium berlandieri A.Gray
  • Eupatorium oregonum Nutt.
  • Kyrstenia occidentalis (Hook.) Greene

Ageratina occidentalis is a species of flowering plant in the daisy family known by the common name western snakeroot or western eupatorium.[2] 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.[3]

Ageratina occidentalis is a rhizomatous perennial herb growing fuzzy green or purple stems to a maximum height near 70 centimeters. The glandular leaves are 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.[4]


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