Distribution: Chiefly west of the Cascades but occasionally on the east slope in Washington; British Columbia to California.
Habitat: Open prairies at low elevations to subalpine ridges.
Conservation Status: Not of concern
Perennial from light-colored, slender, scaly, horizontal rhizomes, the flowering stems 5-25 cm. tall, glabrous to puberulent.
Basal leaves usually one, thin, trifoliate, mostly glabrous, the leaflets 1-3 cm. long, bi-serrate with rounded teeth, the lateral pair often deeply lobed; the flowering stem naked except for a whorl of 3 leaves near the midpoint, these similar to the basal leaves.
Flowers single; sepals usually 5, white, or sometimes bluish or pinkish, oblong, 6-10 mm. long; petals none; stamens 12-20; pistils numerous.
Achenes ovate, 3-4 mm. long, finely pubescent; style 0.5 mm. long.