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Leaves consisting of a petiole, one pair of leaflets, and a small flat appendage 2–4(5) × 1–1.5 mm at the petiole apex on the ventral side; petiole (1)1.5–4(4.8) cm long, glabrous; leaflets (2)4–10(13) × (1.5)2.5–5(6.5) cm, obliquely ovate or lanceolate to falcate-triangular, somewhat asymmetric at the base and with a basal pulvinus broader than long and (7)8–12(14) prominent nerves radiating from it (a distinct midrib lacking), acute to obtuse at the apex, glabrous, coriaceous, with a raised reticulum of secondary veins, with numerous pellucid gland dots; stipules up to 5 × 3.5 mm, ovate, falling very early.
A shrub or tree. It grows 1-30 m high. It loses many leaves during the year. It can have one or many stems. The crown is round. The bark is thick and fibrous. It is dark grey and has deep cracks along it. The leaves are alternate and have 2 leaflets. The leaf stalk is 2-4 cm long. The leaflets do not have stalks. The leaves are like butterfly wings. There are 7-12 veins from the base. The leaves smell of turpentine when crushed. The flowers are in short panicles in the axils of leaves. They are whitish-green. The fruit is a flattened pod. It is almost kidney shaped.
Fruits (2.7)3–4.5(6) × 1.8–2.5(3.2) cm, asymmetrically obovate to laterally reniform (i.e. reniform with the pedicel attached at one side, not in the middle of the curve), rounded distally and with the attachment of the style half to two-thirds of the way along the upper side, compressed, glabrous, straw-coloured with minute sunken glandular flecks of darker brown, usually with raised reticulate venation, indehiscent.
Inflorescences of usually 7–13-flowered axillary racemes up to 7 cm long (including peduncle), simple or sometimes with one or two branches at the base, or occasionally almost forming a panicle towards the ends of branches; bracts broadly ovate to suborbicular, caducous leaving a raised scar below the pedicel; pedicels 4–8 mm long.
Small to medium-sized tree or shrub, up to 12 m high. Leaves with single pair of large leaflets; leaflets articulated basally, asymmetric, semicordate-ovate, 40-90 x-25-50 mm. Pods yellowish brown, compressed, reni-form with numerous, scattered resin glands. Flowers greenish white or greenish yellow.
Small to medium tree 4–15 m tall, or sometimes larger up to 22 m, with 1–several main trunks from the base and rather few main branches diverging at a narrow angle or sometimes remaining stunted as a shrub; bark deeply vertically fissured, often in an elongate-reticulate pattern; deciduous.
Seed filling most of the fruit, compressed, subreniform, with a flattened margin c.1 mm wide, the surface deeply contorted into a pattern of ridges and valleys and pitted with numerous reddish glands, sticky.
Ovary c.3 × 1.5 mm, flat, obovate, rounded at distal end, with style attached on upper margin, glabrous; style c.2 mm long, glabrous; stigma broad, asymmetrically peltate.
Sepals 4, 2 outer enclosing two inner in bud, suborbicular, green or yellowish, scarious towards margins, glabrous, all reflexed in flower.
Stamens 20–25; filaments c.6 mm long, whitish; anthers 1.3–2(2.5) mm long, yellowish.
Flower buds spherical, up to 4(6) mm diameter.
Young branches glabrous, smooth, grey.
