UW Burke Herbarium species comparison

Basal leaves several, the blades lyrate-pinnatifid, up to 3 dm. long;

leaflets 9-23, triangular-ovate to cordate, the terminal one much the largest, up to 15 cm. wide;

cauline leaves 2-5, with leaf-like stipules.

Leaves mostly basal, several, lyrate-pinnatifid, up to 3 dm. long, the leaflets once or twice serrate, the three terminal leaflets much larger than the others;

cauline leaves 3-5, reduced, pinnatifid below to deeply 3-lobed above.

Flowers several in an open, asymmetrical inflorescence;

calyx saucer-shaped, the 5 lobes 4-5 mm. long, reflexed, alternating with 5 simple bracteoles;

petals 5, yellow, 4-6 mm. long;

stamens and pistils numerous.

Inflorescence open, 3- to 7-flowered, nodding in bud;

calyx broadly cup-shaped, reddish-purple, the 5 lobes lanceolate and pointed, erect, 10 mm. long, alternating with 5 small, simple bracteoles;

petals 5, yellow to pinkish, 2-3 mm. shorter than the sepals;

stamens about 100;

pistils numerous, the styles strongly bent and jointed.

Achenes compressed, elliptic, 3 mm. long, the style bent and divided at mid-length, the lower segment 4 mm. long, reddish, hooked at the tip, the upper segment 1-1.5 mm. long, yellowish.

Achenes elliptic, 3-4 mm. long, stiff-hairy, the lower joint of the style 6-8 mm. long, hooked at the tip, the upper joint 3-4 mm. long, deciduous.