Trees, deciduous. Stipules free, very small and caducous. Leaves distichous or spiral, imparipinnate. Leaflets 5 — 12( — 17) per leaf, alternate, petiolulate; midrib furrowed above, prominent below; lateral nerves usually many, very slender, often obscure and hardly distinguishable especially on the upper surface; veins loosely finely reticulate, often obscure or indistinct. Inflorescences axillary or terminal, paniculate; bracts and bracteoles minute, inconspicuous, usually caducous; pedicels very short or absent. Hypanthium absent. Calyx 5-lobed, lobes regular, imbricate, puberulous to thinly pubescent. Petals 5, more or less equal in shape and size. Disk absent. Stamens 5, free, more or less equal in length; filaments very short, glabrous; anthers basifix, opening with apical and basical pores, both pores connected by a thin (nearly) dehiscent rim and sometimes appearing to be longitudinally dehiscent. Ovary sessile or subsessile, 1-ovuled; style and stigma rather short and small. Pods laterally strongly compressed, twisted 180° or not at the base, indehiscent or slightly dehiscent only when germinating, surrounded by a broad, papery wing, the centre thickened and veined. Seeds strongly laterally compressed, exalbuminous.
UsesThe timber is suitable for structural usage, when treated with wood preservatives also outdoors. See Wan Razali & Sudo Soerianegara & Lemmens PI. Res. SE Asia (PROSEA Handb.) 5 (1), Major commercial timbers 1993 270-275.
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