Psoralea L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 127

43. Psoralea L. 1

Perennial herbs or shrubs. Leaves 3-foliolate (in European spp.), glandular-punctate; stipules small, free. Flowers in axillary heads or racemes, with a pair of 3-fid bracts at the base. Calyx campanulate, with 5 unequal teeth; corolla blue-violet to white; keel obtuse; stamens monadelphous. Legume indéhiscent. Seeds 1.

Leaflets entire; flowers in heads 1. bituminosa Leaflets dentate; flowers in racemes 2. americana