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Family = Asteraceae, Genus = Ageratina, Species = occidentalis, including synonyms,

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Ageratina occidentalis   (western snakeroot, western boneset)  
(= Eupatorium occidentale in Flora of the Pacific Northwest)
Rhizomatous perennial from a woody base, the several stems 1.5-7 dm. tall.
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho and Utah.
Habitat: Rocky places at various altitudes.
Origin: Native

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Washington Native Plant Society
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