Tree to 38 m, often of poor form; bole to 80 cm diam., fluted to c. 4 m with buttresses to 60 cm tall and 1 m out. Bark thin, lenticellate to finely fissured and shedding irregular strips; inner bark red-brown, yellower within, usually with strong smell of onions; sapwood fawnish; heartwood red-brown. Twigs cicatrose, striate, elenticellate. Leafy twigs c. 5–8 mm diam.; apical buds with fist-shaped young leaves, ± pubescent. Leaves to 60(–120) cm, usually smelling of onions when crushed, 3–6(–8)-jugate, subglabrous, subcoriaceous, petiole 5–15 cm, flattened adaxially, weakly swollen at base. Leaflets 7.5–25 by 2.5–7.5 cm, elliptic or ovate, or subfalcate, opposite to subopposite with an apical pair or one of these appearing terminal and with a small apical scar, shiny dark green adaxially, bases ± asymmetric, apices acuminate, nerves 8–12(–14) on each side, arcuate, subprominent abaxially; petiolules 5–20 mm, sulcate. Thyrses to 40 cm, pyramidal, proximal branches 8–20 cm with branchlets to 5 cm, bearing cymules of 1–3 sweetly scented flowers; axes puberulous; bracts and bracteoles minute. Flowerbuds with truncate apices, oblong; pedicels 2.5–4 mm long. Calyx c. 2.5–3 mm diam., shallowly cupular or salveriform, glabrous to subpuberulous without, margin 4-toothed. Petals 4 or 5, 5–8 mm long, linear, valvate, glabrous or pubescent within, white, or pinkish, drying black. Staminal tube glabrous or puberulous without, ± hairy within, margin subtruncate to 8-(or 10-)denticulate; anthers 8 (10), c. 1 mm long, included. Disk c. 1 mm tall, ± pubescent on both sides, truncate to obscurely lobed, margin ciliate. Ovary glabrous to hirsute, 3-locular, each locule 2-ovulate, style terete; stylehead subdiscoid, ± dimpled. Infructescence ± branched, to 25 cm long. Capsule to 7.5 cm diam., subglobose or lobed and constricted between seeds or beaked, occasionally markedly so (the beak to 15 mm) when 1-seeded, greenish white when unripe, red at maturity, drying black. Seeds 1–4 per capsule; oblong-globose, testa red, exarillate, when cut producing white latex and usually strong smell of onions; cotyledons superposed to collateral.
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Tree to 38 m high; bole to 80 cm diam., sometimes fluted and with buttresses to 60 cm high and 1 m out; bark smooth to finely fissured; slash usually onion-scented. Leaves in spirals, fist-shaped in bud, 20–60 cm long, paripinnate, 3–6-jugate, garlic-scented when bruised; petiole 5–15 cm long; leaflets elliptic to ovate or subfalcate, 7.5–25 cm long, 2.5–7.5 cm wide, asymmetric at base, acuminate at apex, subglabrous. Thyrses to 40 cm long, axillary, pyramidal, of cymules of subsessile sweetly scented flowers; bracteoles to 1 mm long, caducous. Calyx shallowly cupular or salveriform, 2.5–3 mm diam., 4-toothed, glabrous to subpuberulous outside. Petals 4 or 5, linear, 5–8 mm long, white to pinkish, free of staminal tube. Staminal tube glabrous or puberulous outside, ±hairy inside; margin subtruncate to 8-or 10-denticulate; anthers 8 or 10. Disc c. 1 mm long. Ovary 3-locular; locules usually 2-ovulate. Capsule subglobose, often asymmetric and beaked when young, to 7.7 cm diam., cream to pink or brown, glabrous. Seeds 1–4, ellipsoid, c. 2.0–2.2 cm long, red.
A tree. It grows up to 38 m tall. All parts smell of onion. The trunk can be 80 cm across. It is fluted at the base. It can have buttresses. The leaves are compound with leaflets in pairs but no leaflet at the end. There are 3-8 pairs of leaflets. The leaves can be 60 cm or longer. The leaf stalk is 5-15 cm long. The leaflets are oval and 7.5-25 cm long by 2.5-7.5 cm wide. The flowers are close together with short stalks. The flowering stalk can be 40 cm long. The flowers have a sweet scent. The fruit capsule is 7.5 cm across. It can be 25 cm long and is constricted between the seeds. There are 1-4 seeds per capsule. The seeds are oblong and red.
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