Rhizomatous perennial, simple or sparingly branched, erect, to 1.5 m; lfls bright green, lanceolate or lance-ovate, 5–10 cm, half as wide, acuminate, thinly pubescent beneath; stipules and bracts subulate; peduncles nearly equaling the subtending lvs; racemes 3–8 cm; fls blue, varying to white, 6–7 mm; cal minutely pubescent to glabrate, 2–3 mm, slightly oblique, the short, broad lobes subequal; fr ovate, acuminate, 8–10 mm. Open woods and moist prairies; O. and Ky. to Io. and Mo.; also mt. woods, w. Va. to e. Tenn. and w. S.C. June, July. (Psoralea o.)
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