UW Burke Herbarium species comparison

Leaves with 5-9 leaflets, these rather thick, oblanceolate to obcordate, 1.5-2.5 cm. long;

stipules ovate-lanceolate, their margins lacerate.

Leaves trifoliate, petiolate;

leaflets obovate to elliptic oblanceolate, 5-20 mm. long, the margins sharply serrate, the serrations with needle-like tips;

stipules ovate, deeply lacerate.

Heads mostly solitary and terminal, 3-5 cm. broad and long, the peduncles exceeding the leaves;

flowers 22-28 mm. long, pale pinkish to rose-pink, spreading to erect, the pedicels very short;

calyx 2/3 as long as the corolla, the 5 teeth awl-shaped, plumose, many times as long as the tube.

Inflorescence of 3- to 40-flowered, involucrate heads 1-2 cm. broad on long axillary peduncles;

involucres flaring and saucer-shaped, irregularly lobed and lacerate about half their length;

calyx tube narrowly bell-shaped, 10-25 veined, the 5 teeth much longer than the tube, narrow and bristle-tipped;

corolla pea-like, 5-20 mm. long, slightly longer than the calyx, purplish, often white-tipped, aging to purplish-brown.

Pod 1-seeded.

Pod 1-2 seeded, usually rupturing the calyx.