Slender shrub to small tree up to 3 m tall, reseeder. Stems erect, single, branching in upper portion, flexuous, yellowish-green brown, with numerous greyish white storied lenticels, becoming grey and deeply fissured with age. Seasonal shoots smooth, glabrous or glabrescent, willowy. Leaves 5-7(9)-foliolate, filiform, distributed along the branches, patent, spreading, glabrous, curving, with raised glands; leaflets 24-45 x 0.2-0.3 mm, filiform, glabrous, terminal leaflet shorter than basal pair which are longest, laterals about the same length as the terminal, three uppermost pinnately inserted; petioles 7-9 mm long, shorter than terminal leaflet; rachis 7-15 mm long, furrowed on abaxial face; stipules 0.7-1 x 0.3-0.8 mm, persistent, rapidly senescent at flowering, subulate, margins incurled, glabrous. Inflorescences axillary, borne in upper axils of seasonal shoots with or without leafy extension, pseudo-capitate, congested, 1-3(5) flowers per axil; pedunculate, pedicellate; peduncles more than 45 mm long, filiform, flexuous, shorter to longer than the subtending leaf; cupulum trilobed, glabrous, lobes unequally developed, lower lobe partly cleft, carinal lobe longer, 2 mm long, sparsely hairy along the margins, setose or linear, positioned two thirds up peduncle; pedicels 4-5 mm long. Flowers 1012 mm long, white to pale mauve, scented; buds beaked. Calyx 4-5 mm long, tube 3-4 x 3.5 mm; lobes equally developed, shorter than the tube, finely covered with white hairs, lobes triangular, carinal lobe tooth elongated, lobes splayed at anthesis, tending to purple with age, acute, inner face of lobes densely black pubescent. Standard petal 9-10 x 7-7.5 mm, elliptic, white to mauve, auricles slightly swollen, appendages not well developed, blade oblong, nectar guide prominent, comprised of two large free central white patches with a thinnish purple flash between them; claw 2-3 mm long. Wing petals 8-9 x 3-3.5 mm, broadly cultrate, longer than keel petals, sculpturing present, comprised of 2-3 rows of 6-10 transcostal lamellae; claw 3-4 mm long. Keel 5-6 x 3-3.5 mm, apex acute; claw 2-3 mm long. Androecium 11 mm long, tenth stamen free, fenestrate. Pistil 9 mm long, ovary 2 mm long, style 6 mm long straight, then curved upwards, widest at point of flexure, height of curvature 4 mm long, stigma penicillate. Fruits 4-5 x 2.5-3.0 mm, narrowly oblong, beaked, papery, pedicels persistent after seed shed. Seeds 2-4 x 2 mm long, dark brown to black.
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