UW Burke Herbarium species comparison

Leaves pinnate, the lower ones with 2-4 pairs of elliptic to oblong leaflets with rounded serrations, 1-3 cm. long, the upper sometimes ternate;

stipules well-developed.

Basal leaves numerous, with petioles to 3 dm. long, palmately divided; the leaflets 7-9, broadly oblanceolate to oblong-elliptic, varying from glabrous and green on both surfaces to hairy above and white-woolly below, toothed to deeply dissected;

cauline leaves 1-2, reduced;

stipules up to 2.5 cm. long, entire to lacerate.

Flowers solitary on long peduncles from the leaf axils throughout the upper half of the plant;

calyx stiff-hairy, 5-9 mm. broad, the 5 lobes ovate-triangular, 3-4 mm. long, erect;

petals 5, yellow, obovate, about equal to the sepals;

stamens usually 20, sometimes less;

pistils numerous;

style terminal, equaling the ovary.

Inflorescence large, many-flowered, open, somewhat flat-topped;

calyx 6-10 mm. broad, the 5 lobes 4-10 mm. long, ovate-lanceolate, the alternating bracteoles narrowly lanceolate, nearly as long;

petals 5, yellow, obcordate, longer than the sepals;

stamens 20;

pistils numerous, the style slender, sub-terminal on the achene and the same length.

Achenes 1.2 mm. long with a wedge-shaped thickening on one edge about the size of the rest of the fruit.

Achene 1.5-2 mm. long, smooth, greenish.