Psoralea glabra E.Mey.

Slender woody resprouter up to 3 m tall. Stems few to many, branching at or near the base, spreading to erect and arching, rigid, grey but turning brown when old, plants become quite leggy with age with foliage only in the upper parts; branches striate, glabrous or with a few short hairs on youngest parts. Seasonal shoots short, green, glabrous or with a few short hairs on youngest parts. Leaves 5-9-foliolate, distributed along the seasonal branches, patent, petiolate; leaflets 9-15 x 0.5-1.5 mm, linear, apiculate, glabrous, gland-dotted, terminal leaflet shortest, basal pair variably longer, equal to or shorter than terminal, laterals about the same length of the terminal, three uppermost commonly pinnately (or more rarely digitately) inserted, all glabrous; petioles 3-4 mm long, shorter than the terminal leaflet; rachis 5-10 mm long; stipules 1.3-2.2 x 0.5-1.3 mm, persistent, subulate, swollen, recurved, margins reflexed, becoming woody on old branches, fused for half their length, glabrous. Inflorescences axillary, borne in upper axils of seasonal shoots with or without leafy extension, pseudo-capitate or pseudo-spicate, lax, 1-3 flowers per axil, pedunculate, pedicellate; peduncles stout and rigid, shorter to longer than the subtending leaf, 4-11 mm long; cupulum bilobed or trilobed, glabrous, 2.5 mm long; pedicel 2-3 mm long. Flowers 10-13 mm long, mauve to pale mauve. Calyx 3-5 mm long, tube 3-4 x 3.5 mm, glabrous to sparsely hairy, densely glandular; lobes sub-equally developed, all acuminate, emarginate; tube and lobes sometimes densely dark pubescent within and appearing ciliate. Standard petal 10-11 x 8-10 mm, obovate, mauve to pale mauve but may appear whitish blue in some light, veins purple; claw 2-3 mm long. Wing petals 10-11 x 3-4 mm, mauve to almost white (especially northern populations), narrowly oblong-oblanceolate; fused to but longer than the keel; sculpturing present, basal, comprised of 2-3 rows of 8-10 transcostal lamellae, claw 2-3 mm long. Keel 8-10 x 2.5-3.5 mm, dark purple on inner face at apex; claw 2-3 mm long. Androecium 10 mm long, tenth stamen free, fenestrate. Pistil 9 mm long, ovary 1.3 mm long, style 6 mm long, straight then curved upwards, swollen at point of flexure, height of curvature 2.5 mm long, sparsely covered with club-shaped glands. Fruits 3-4 x 2.5-3.0 mm, oblong, papery, wrinkled, remaining enclosed in the dessicated calyx. Seeds 3-3.7 x 2-2.5 mm, dark brown to black.