Aporosa nigricans Hook.f., Fl. Brit. India 5: 347. 1887.

Shrubs to trees, up to 18 m high; young branches sparsely puberulous. Leaves elliptic, rounded to acute at base, acuminate to cuspidate at apex, undulate to crenate or serrate along margins, 12 - 25 x 5 - 14 cm, chartaceous; basal glands small, indistinct; marginal glands distinct; glabrous above, sparsely hirsute beneath; lateral nerves 8 - 11 pairs; petioles 1 – 3 cm long, distinctly pulvinate; stipules caducous. Inflorescences axillary. Male inflorescences 1 - 6 together, 1 – 3 cm long; peduncles absent or up to 2 mm long; bracts triangular, ca 1 mm long; glomerules with 14 - 20 densely set flowers; pedicels ca 0.2 mm long; sepals (3) 4 (5), obovate, 0.5 - 0.8 mm long; stamens 2, 0.3 - 0.6 mm long; anthers ca 0.2 mm long; pistillode minute. Female inflorescences 1 - 3 together, 2 - 9 mm long; flowers up to 9, densely arranged along rachis; bracts triangular, 0.8 – 1.6 mm long; pedicels up to 1 mm long; sepals (3 or) 4, ovate, patent, 1 - 2 mm long; ovary 2-locular, densely tomentose; stigmas sessile to slightly raised, 0.5 - 1.5 mm long, divided. Fruits ovoid, 10 - 12 x 9 - 12 mm, with yellowish-whitish sutures, sparsely hairy, not fleshy; septae and column sericeous (sparsely and mostly along margins); seeds 6 - 8 x 3 - 4 mm.

Fl. & Fr. Period unknown.

Distrib. India: Primary, secondary, cleared or open forest, margins of swamp forests, on roadsides, hillsides, etc., up to 600 m. Nicobar Islands.

Thailand, Malay Peninsula (type), Sumatra, Borneo.