Treelet up to 15 m high, dbh up to 40 cm. Branchlets greyish brown, terete, rather densely minutely lenticellate, glabrous except for the sparsely appressed short-hairy tips, furthermore glabrous. Leaves 1-3-jugate (according to Blume sometimes ternate or 1-foliolate); petiole slender, 2.5-6 cm, terete at base, flattened and cannate at apex; rachis up to 7.5 cm, in the upper part flattened and broadened (to marginate). Leaflets sub-sessile (or with petiolules up to 3 mm long, swollen at base), opposite or subopposite, (elliptic or) oblong (rarely ovate-oblong) to lanceolate, sometimes slightly falcate, 6-16.5 by 1.5-4 cm, when dried greyish green to brown and shining above, lighter and dull beneath; base cuneate-attenuate; apex obtuse to rounded; midrib above slightly car-inate, beneath more or less prominent, nerves 12-28 per side, nearly transverse, straight to slightly curved, looped and joined near the margin, slender, barely prominent on both sides, between every two nerves 1 or 2 intermediate veins nearly as strongly developed as these, veinlets almost as prominent. Inflorescences paniculate, 15-25 cm long; branches long, erect, branched again, bearing in their upper half stalked, few-flowered cymes; bracts lanceolate, 1-2 mm long. Sepals with a broad, membranous, short-ciliate margin, outer nearly semi-orbicular, c. 2 mm diam., inner nearly orbicular, c. 3 mm diam. Petals obovate-cuneate, concave, short-clawed, c. 3 by 2.5 mm, outside sparsely hairy near the base, rather long ciliate at the base; scales nearly orbicular to deeply bilobed, c. 0.5 mm long, densely long-hairy. Disc annular, c. 0.5 mm high, thin, glabrous. Stamens in male flowers 3 mm long, filaments 2.5 mm long; in female flowers 2 mm long, filaments 1 mm long; anthers 1 mm long. Pistil 2 mm long; ovary hairy along the upper half of the angles; style slightly shorter, long-conical with thickened stigmatic lines in the upper part; in male flowers strongly reduced to absent. Fruits glabrous, samarae c. 2.5 cm long, wing 1 cm wide, straight. Seeds subovoid, c. 7.5 by 4 mm.
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Tree to 12 m high. Young parts, branchlets and peduncles puberulent, soon glabrous. Leaves paripinnate; petiole and rachis with broad or narrow wings or wings absent; rachis 1–3 cm long; leaflets 1–3 pairs; lamina narrowly elliptic-oblong or obovate-oblong, obtuse or subacute, 4.5–13.5 cm long, 0.7–2 cm wide, the juveniles larger, green on both surfaces, acute at base, usually glabrous, thinly coriaceous; petiolule 1–5 mm long; petiole 1.5–6 cm long. Panicles 8–26 cm long; pedicels 4–7 mm long. Sepals 2–3 mm long and wide, glabrous. Petals 5, obovate, 5–7 mm long, 2.5–3.5 mm wide, puberulent outside; scales without crests. Disc complete. Samaras 2.5–3.5 cm long, glabrous, wings falcate.
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