Publication: Proc. Acad. Nat. Sci. Philadelphia. 4: 19. 1848.

Origin: Native

Herbarium search: CPNWH

Notes: FNA5: "Subspecies dendroidea is common and widespread in western North America from southeastern Oregon to southwestern Wyoming southward into eastern California (as far south as Inyo County), Nevada (to Nye County), but surprisingly unknown from northern Utah. Populations in Washington and Wyoming are extensions of the Snake River Plains populations found in Idaho."

Last updated 2/11/2024 by David Giblin.