Distribution: Occurring chiefly west of the Cascade crest; Alaska south to California, east to western Nevada.
Habitat: Open wet area in subalpine and alpine marshes and seepages.
Flowers: June-August
Origin: Native
Conservation Status: Not of concern
Stems erect, 0-1 leaves.
Basal leaves orbiculate-reniform to oblong. Margins mostly entire, sometimes crenate to dentate.
~15-40 millimeters in diameter. Sepals colored faintly, white to yellow. Sepals abaxially blue to dark violet.
Follicles; 4-15 linear-oblong bodies, style and stigma straight or curved slightly. Seeds elliptic. ~2 millimeters long
Caltha howellii (Huth) Greene
Caltha leptosepala DC. ssp. biflora (DC.) P.G. Sm.
Caltha leptosepala DC. ssp. howellii (Huth) P.G. Sm. [KZ99]
Caltha leptosepala DC. var. biflora (DC.) G. Lawson
PNW Herbaria: Specimen records of Caltha biflora in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Caltha biflora checklist entry.
E-Flora BC: Caltha biflora atlas page.
CalPhotos: Caltha biflora photos.
USDA Plants: Caltha biflora information.
