Page authors: Don Knoke, David Giblin
Arcteranthis cooleyae
Cooley's buttercup

Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington.

Habitat: Damp slopes and rocky crevices at high elevations, blossoming as snow recedes.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Threatened in Washington (WANHP)


Scapose perennial from a thick, fibrous root, glabrous throughout.


: Leaves all basal, the petioles up to 15 cm. long, the blades reniform, 1.5-4 cm. broad, deeply 3- to 5-lobed, the main segments overlapping, usually 2-3 lobed half their length and deeply round-toothed.


Scapes 1-flowered, naked or with a bract mid-length, 10-35 cm. tall; sepals 5, broadly ovate, 7-10 mm. long, glabrous; petals 7-12, yellow, slender, long-clawed, barely exceeding the sepals; nectary scale V-shaped, attached the entire length of the margins; stamens 75-125; pistils 70-100.


Achenes glabrous, 2.5 mm. long, elliptic in outline, stylar beak slightly hooked.

Accepted Name:
Arcteranthis cooleyae (Vasey & Rose) Greene
Publication: Pittonia 3(16): 190. 1897.

Synonyms & Misapplications:
Kumlienia cooleyae (Vasey & Rose) Greene [KZ99]
Ranunculus cooleyae Vasey & Rose [FNA3, HC]
Additional Resources:

PNW Herbaria: Specimen records of Arcteranthis cooleyae in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Arcteranthis cooleyae checklist entry.

OregonFlora: Arcteranthis cooleyae information.

E-Flora BC: Arcteranthis cooleyae atlas page.

CalPhotos: Arcteranthis cooleyae photos.

USDA Plants: Arcteranthis cooleyae information.

10 photographs:
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