Tree to 25(–35) m with clear bole to 18 m, (25–)40(–75) cm diam., buttressed to 2.5 m. Bark smooth with pustular lenticels to irregularly finely flaking, red-or grey-brown; inner bark mottled red-brown and purplish, darkening on exposure, weak reddish exudate; sapwood cream; heartwood pale red-brown. Twigs stout, pithy, greyish, cicatrose, usually brown pilose when young, occasionally myrmecophilous. Leafy twigs c. 11–13 mm diam.; buds with fist-shaped young leaves. Leaves to 80 cm long, 5–7-jugate with terminal spike or its scar, one lateral leaflet often appearing terminal; petiole 8–25 cm, ± brown pubescent, flattened to shallowly channelled adaxially. Leaflets oblong or ovate, the largest the most distal, 20–40 by 8–15 cm, glabrous and shiny or with finely hairy venation, especially on midrib where brownish, adaxially sericeous to brown pilose abaxially, particularly on veins, bases ± asymmetric, obtuse to rounded or subcordate, apices shortly acuminate, costae c. 18–21 on each side, spreading, inarched but not looped at margin, secondary veins sometimes almost as conspicuous, tertiary venation subscalariform, often prominulous; petiolules 5–13 mm, often sulcate. Thyrses 10–13 cm, patent, borne in axils of leaves or cicatrices, sometimes ± supra-axillary; axes ± conspicuously brown pilose, often woody and stout, branching ± decussate, branches to 15 cm long, bearing congested branchlets of cymules; bracts c. 1.5 mm long, triangular, pubescent. Flowers subsessile, fragrant. Calyx 4–5 mm long and in diam., cupular, densely adpressed pubescent without, margin 4-lobed to 1/3 length. Petals 4, 13–15 mm, cream, densely sericeous without. Staminal tube glabrous, margin subtruncate; anthers (7) 8, c. 1.5 mm long, narrowly ovate, inserted well inside tube with free filament c. 0.5 mm. Disk 4–5 mm tall, villous apically within and on fimbriate pale green margin. Ovary 4-locular, densely sericeous; style densely sericeous in proximal half; stylehead capitate. Capsule c. 3.5 cm long, 3 cm diam., subpyriform, brownish, to whitish when mature, drying reddish minutely pubescent; pericarp with white latex (Pennington), constricted between seeds. Seeds oblong, c. 2 cm long, without aril.
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