Asteraceae

Western snakeroot

Ageratina occidentalis (Hook.) R.M.King & H.Rob.

Family: Asteraceae
Genus: Ageratina

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Western snakeroot (Ageratina occidentalis) — FlowerPhoto: Wendy McCrady, CC BY 4.0, from iNaturalist

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Common names

By language (2)

English: Western snakeroot
nv: Biłhaazhchin, Biłhaazhchʼííʼ

Synonyms

Eupatorium berlandieri A.Gray
Eupatorium occidentale Hook.
Eupatorium occidentale var. decemplex A.Nelson
Eupatorium occidentale var. occidentale
Eupatorium occidentale var. subroseum DC.
Eupatorium oregonum Nutt.

Characteristics

Growth habit: Forb/herb, Subshrub
Lifespan: Perennial
In the US and Canada: Lower 48 states: native

Photos

FlowerPhoto: Wendy McCrady, CC BY 4.0, from iNaturalist
FlowerPhoto: Trevor Van Loon, CC BY 4.0, from iNaturalist
FlowerPhoto: Nick Doty, CC BY 4.0, from iNaturalist
FlowerPhoto: Nancy Overholtz, CC BY-SA 4.0, from iNaturalist
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons
Photo: Daderot, CC0, from Wikimedia Commons
Photo: Matt Berger, CC BY 4.0, from iNaturalist
Photo: Matt Berger, CC BY 4.0, from iNaturalist
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons
Photo: James Stevens, CC BY 4.0, from iNaturalist
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons
Photo: Leah Gardner, CC0, from iNaturalist

More in Ageratina

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.