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Annual herb from a taproot; stems 1 to several, erect, 20-80 cm tall, mostly unbranched, long-soft-hairy.
Alternate, palmately compound; leaflets 3, egg- to heart-shaped, 1-3 cm long, fine-toothed on the upper half; stipules egg-shaped to oblong, sheathing at the base, 1-2 cm long, strongly veined, reddish- or purple-margined.
Inflorescence a dense, cylindric or egg-shaped, terminal head of many pea-like flowers, the heads 2-6 cm long, lacking involucres but subtended by a single leaf; corollas crimson, 12-15 mm long, the banner pointy-tipped and longer than the wings and keel; calyces densely long-hairy, about 3/4 as long as the corollas, the tube ribbed, the teeth bristle-like.
Pods, about 2.5 mm long; seeds usually 1.
Source: The Illustrated Flora of British Columbia