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.

Basal leaves several, long-petiolate, the blades oblong-obovate in outline, up to 15 cm. long, lyrate-pinnatifid, the main segments 5-9, obovate with a wedge-shaped base, strongly cleft and double-toothed, the terminal segment lobed over half its length;

cauline leaves several, the lower ones pinnatifid, with large, leaf-like stipules, the upper only 3-lobed.

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.

Flowers several in a leafy-bracteate, unsymmetrical cyme; tubular portion of the calyx saucer-shaped, 3-4 mm. long;

calyx lobes 5, reflexed, 5-8 mm. long;

petals yellow, spreading, slightly longer than the sepals;

stamens 60-100;

pistils numerous;

styles abruptly bent above mid-length, of 2 distinct segments, the lower segment glabrous, brownish, 4.5 mm. long, persistent and hooked, the upper segment hairy, 1.5 mm. long, deciduous.

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 flattened, elliptic, 3-4 mm. long