Much branched, 1–4 dm from a tuberous-thickened root, conspicuously spreading-hairy; petioles of at least the larger lvs mostly (3–)4–10 cm; lfls 5, oblong to oblanceolate or narrowly obovate, 2–6 cm; spikes dense, leafy-bracteate, 3–8 cm; fls blue, sessile or nearly so, 15–20 mm; cal-tube gibbous, 5–6.5 mm, glabrous or sparsely hirsute, the lobes subequal, lance-linear, 7–10 mm, ciliate; fr hirsute, the flat beak evidently longer than the body; 2n=22. Dry prairies and plains; Minn. and Wis. to Mo. and Tex., w. to Alta. and N.M. May–July. (Psoralea e.)
Rocky woods and prairies, on calcareous soils. Prairies, open pine forest and grasslands; at elevations from 500-2,000 metres.
Can be grown by seedlings. Seeds needs soaking.
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