UW Burke Herbarium species comparison

Basal leaves single, trifoliate, the leaflets once or twice shallowly lobed and remotely serrate; the flowering stem naked except for a whorl of 3 leaves near the top, these trifoliate, petiolate, the leaflets up to 8 cm. long, the lateral pair deeply lobed, all remotely toothed.

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, ovate-oblong, 12-20 mm. long, usually blue to blue-violet, but occasionally white or pinkish;

petals none;

stamens 35-100;

pistils numerous.

Flowers single;

sepals usually 5, white, or sometimes bluish or pinkish, oblong, 6-10 mm. long;

petals none;

stamens 12-20;

pistils numerous.

Achenes narrowly oblong, 4 mm. long, finely pubescent;

style 0.5 mm. long, glabrous.

Achenes ovate, 3-4 mm. long, finely pubescent;

style 0.5 mm. long.