Psoralea affinis Eckl. & Zeyh.

Small to large slender shrub or treelet up to 3 m tall, reseeder. Stems erect, single, branching from lower portion, grey or brown, branches spreading or arching, rigid, with scattered white storied lenticels. Seasonal shoots green, glabrous or glabrescent. Leaves (5)7-9(11)-foliolate, patent, distributed along the branches, in older plants clustered at tips, petiolate; leaflets 20-35 x 0.2-0.4 mm, linear lanceolate, terminal leaflet shortest, basal pair longest, lateral about the same length of the terminal, three uppermost leaflet digitately inserted, sparsely hairy; petioles 4-5 mm long; rachis 15-20 mm long; stipules 2-3 x 1-2 mm, small, deltoid, spreading to recurved, twisted, callose, becoming woody. Inflorescences axillary, borne in upper axils of seasonal shoots but without leafy extensions, pseudo-spicate, lax, two, three or more flowers per axil, pedunculate, pedicellate; peduncles stout and rigid, 17-30 mm long; cupulum bilobed or trilobed, slightly overlapping base of the calyx or free of it; pedicels 1-3 mm long. Flowers 12-15 mm long, dark blue to dark purple, fading with age, maturing more or less simultaneously. Calyx 7-8 mm long, tube 4.8-5.1 x 4 mm, nigro-hirsute; lobes equally developed, 2-3 mm long, shorter than the calyx tube; lateral and vexillar lobe lanceolate; carinal lobe acute, same width as other four lobes. Standard petal 10-12 x 8.5-10 mm, broadly ovate, dark blue to dark purple with large M-shaped white nectar guide with a small dark purple flash in crotch, veins darker than blade; claw 3-4 mm long. Wing petals 8-9 x 3-3.5 mm, blue to pale mauve, auricles well developed, sculpturing present, basal, comprised of 2-3 rows of 10-12 transcostal lamellae; claw 3-4 mm long; fused to and longer than keel. Keel 7-8 x 2.5-3.5 mm, white, suffused on inner faces of the apex with violet-purple; claw 3-4 mm long. Androecium 11 mm long, tenth stamen slightly attached, broadly fenestrate. Pistil 10 mm long, ovary 3 mm long, style filiform, 6 mm long to the point of flexure where it curves, swollen at point of flexure, height of curvature 3 mm long, glabrous but with many small stalked club-shaped glands on upper part, stigma penicillate. Fruits 4-5 x 2-3.0 mm, oblong. Seeds 3-4 x 2-2.8 mm, dark brown.