Psoralea margaretiflora C.H.Stirt. & V.R.Clark

Erect resprouter up to 2 m tall, forming dense clumps. Stems erect, 1-30, branching at or near the base, greyish-brown with numerous white storied lenticels, bare except for bright green, glabrous, glandular, seasonal shoots in the upper axils, radiating either terminally from stems or along older shoots giving a broom-like appearance. Seasonal shoots produced seasonally on old stems, leafy along entire length. Leaves 7-foliolate at base of each seasonal shoot, 5-foliolate thereafter, leaf size variable, larger on water shoots from the rootstock, distributed evenly along the seasonal branches, glabrous, petiolate, patent; leaflets (15)18-25(33) x (0.3)0.5-1(1.5) mm, linear lanceolate, basal pair longest, mid-pair shortest, and terminal leaflets second longest; three uppermost pinnately (rarely digitately) inserted; shiny, glabrous, dark green; apex acuminate, base rounded; petioles 4-5 mm long, shorter than terminal leaflet; rachis 7-15 mm long; stipules 2-3(4) x 2 mm, persistent, shorter than petiole, triangular, glabrous, rigid, semi-patent; rapidly senescent on flowering shoots. Inflorescences axillary, borne in most axils of seasonal shoots, pseudo-spicate, lax, 1-3(5) flowers per axil, pedunculate, pedicellate; peduncles stout and rigid, (10)15-17 mm long, equal in length to the subtending leaf; cupulum trilobed, glabrous, lobes unequally developed, lower lobe longest, acuminate, upper two lobes fused for half their length, yellowish, rapidly senescent, 1.0-1.2 mm long; pedicels 1-1.5 mm long. Flowers 10-12 mm long, white to greenish white. Calyx 5-6 mm long, tube 3-4 x 4 mm, ribbed, glandular, pale green, glabrous on outside; lobes equally developed, same length as the tube, triangular, all 3 mm long, carinal lobe cucullate at apex, finely black-haired on inner face of lobes. Standard petal 9-10 x 7-8 mm, broadly elliptic, greenish white, nectar flash purple, trifid above the strongly developed auricles; claw 2-3 mm long. Wing petals 9-10 x 3-4 mm, white, locked into keel but not fused, petal sculpturing present, upper basal, comprising 7-8 transcostal parallel lamellae; claw 2-3 mm long. Keel 7-9 x 4-5 mm, apex deep purple; purple on inner face of apex; claw 5 mm long. Androecium 9 mm long, tenth stamen free, sheath split adaxially, fenestrate. Pistil 9 mm long, ovary 1.5 mm long, stipitate, glabrous, style straight for 6 mm long, then curved upwards, thickened at point of flexure, height of curvature 2 mm, erect, penicillate. Fruits oblong, 4-5 x 2.5-3.0 mm. Seeds solitary, 2-4 x 2 mm, dark brown to black.