Tree to 30 m high, to 90 cm girth. Branchlets glabrous or puberulous, glabrescent. Stipules not seen. Leaves: rachis 12-21 cm, adaxially sulcate, puberulous; pinnae 3-5(-6) pairs, puberulous, 5.7-11 cm; petiolules 1-2 mm, puberulous (or glabrous); leaflets (4-)5-9 on each side of the pinna, thinly chartaceous, drying light brown to dull grey-green above and light grey-green beneath, asymmetrically ovate-oblong, oblong-obovate, or sub-trapezoid, 1-2.7 by 0.6-1.8 cm; base partly cuneate/pardy rounded, apex rounded to truncate, often emarginate or mucronulate, both surfaces puberulous to glabrous, lateral veins prominulous, 8-10 per leaflet-half, oblique, non-parallel, anastomosing near the margin. Raceme (incl. peduncle) 6.5-11.5(-25) cm, puberulous; floral bracts filiform, 0.75 mm, caducous; pedicel 1.5-3 mm, usually puberulous to sericeous (rarely glabrous). Flowers yellowish white, turning dark yellow at anthesis. Calyx shallow, cup-shaped, 0.5-0.75 mm, faintly appressed puberulous to sericeous (rarely glabrous); teeth inconspicuous, rounded. Petals 2.5-3.5 mm, oblong, acute, usually glabrous but occasionally puberulous towards the apex. Stamens 3-4.5 mm; anthers 0.5 mm. Ovary 1.6-2.2 mm, densely sericeous (with a few appressed hairs); style 1-1.5 mm, shorter than the ovary. Pod brown to dark brown, densely spirally contorted before dehiscence, up to 15 by 0.8-1.2 cm, 6-10 seeded. Seeds bright scarlet red, suborbicular to ellipsoid or broadly obovoid, 5.5-7(-8) by 4.5-7 by 4 mm, areole running c. 1 mm from the margin of the seed, open towards the hilum.
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Trees, deciduous, 5-20 m tall. Branchlets puberulent. Petiole and rachis puberulent; pinnae 3-5 pairs; leaflets 4-7 pairs, with short petiolules, alternate, oblong or ovate, 2.5-3.5 × 1.5-2.5 cm, both surfaces puberulent, both ends rounded-obtuse. Racemes simple, axillary or arranged in panicles at apices of branchlets, puberulent. Flowers white or yellow, small, fragrant, shortly pedicellate. Calyx less than 1 mm, together with pedicel golden yellow puberulent. Petals oblong, 2.5-3.5 mm, usually glabrous but occasionally puberulent toward apex, slightly connate at base. Stamens 3-4.5 mm; anthers ca. 0.5 mm. Ovary nearly sessile, villous; style filiform; stigma small. Legume narrowly oblong, 10-20 × 1.2-1.4 cm, valves contorted after dehiscence. Seeds scarlet or yellow, suborbicular to ellipsoidal, 5-8 × 4.5-7 mm. Fl. Apr-Jul, fr. Jul-Oct.
It differs from A. pavonina, though not very satisfactorily or constantly, in its puberulous calyx and pedicels, pods twisted spirally before dehiscence, and the seeds 5–7 mm. in diameter.
Valleys, along streams, forests, from sea level to 1,000 metres. Dry evergreen and deciduous forest, and in forest margins at elevations up to 600 metres.
Can be grown by seedlings. Seeds needs soaking.
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