UW Burke Herbarium species comparison

Leaves alternate, trifoliate;

stipules 1-2.5 cm. long, with entire, acuminate tips;

leaflets oblong-elliptic to oblanceolate or broader, 1-3.5 cm. long, finely denticulate the entire length, the teeth needle-like.

Inflorescence of 10- to 50-flowered heads, the heads axillary as well as terminal, 1-2 cm. long, subglobose, without an involucre;

flowers white to purplish, 6-12 mm. long, erect but becoming reflexed as the pedicles elongate to up to 6 mm.;

calyx glabrous, about equal to the corolla, the tube 10-veined, the 5 teeth fringed, 2-3 times as long as the tube, the upper 2 much the longest.

Pod 1-seeded