Compilation
Psoralea capitata

tall, sparingly branched, laxly leafy or leafless; leaves distant, trifoliolate or unifoliolate, petiolate; leaflets linear-lanceolate or linear, acute at each end, sparsely pilose or glabrous, punctate; stipules subulate-acuminate; peduncles very short, many together, densely fascicled in the upper axils, and aggregated in a terminal head, or interruptedly spicato-capitate; calyx variably pubescent, its segments lanceolate-acuminate. Stems numerous, 3–4 feet high, rushlike, striate, sometimes quite simple or branched near the base, the branches simple and curved, variably pubescent. Leaves 2–6 inches apart, the petiole variable in length; lower leaves mostly trifoliolate, the upper often unifoliolate, or (as in P. aphylla) reduced to a scale. Flowers very densely aggregated at the ends of the branches; the inflorescence sometimes interrupted, several fascicles closely following each other in an oblong pseudo-spike. Flowers purplish blue.