Shrub or small tree, up to 7 m. high, or rarely a dwarf shrub, 15–25 cm. high, with tuberous roots. Stems branched or several slender unbranched stems arising from the thickened rootstock, smooth or rough with light grey fissured bark. Leaves glabrous, 3–1-foliolate or with simple leaves intermixed; petioles 4–68 mm. long, striate, spiculate or minutely punctiform; petiolules wrinkled, papillose or minutely punctiform; leaflets elliptic, ovate, obovate, linear to lanceolate or oblanceolate, 3–10 cm. long, 0.6–5.3 cm. wide, with a somewhat revolute margin, sometimes undulating, coriaceous. Inflorescence a terminal l–20(or more)-flowered loose corymbose raceme; pedicels bracteate, articulated at the base, 1–2.1 cm. long. Buds 7–14 mm. in diameter prior to rupture. Stamens spreading, wavy, up to 3.6 cm. long; anthers about 3 mm. long. Fruits ellipsoid, 3–6 cm. long, stipitate, prominently costate with up to 12 ribs.