Shrub, or tree to 30 m high and 50 cm ø. Twigs tomentose, pubescent, tomentellous or glabrous, rather thick (3-5 mm). Leaves sparsely appressedly pilose to more or less densely patently soft-villous beneath, especially on midrib and nerves, usually abruptly acuminate with cuneate base and finely to rather coarsely dentate margin, narrowly elliptic to obovate, 15-45 by 5¾-17cm; nerves 12-17 pairs; petiole thickened, 10-25 mm. Flowers in a spike from wood beneath or between the leaves; in bud the inflorescence has the appearance of a short cone; axis pubescent to tomentellous, 1-5(-8) cm. Bracts and bracteoles caducous as soon as the flower matures, ovate, boat-shaped, densely silky-pubescent, 3-5 and 2-3 mm respectively. Calyx appressedly puberulous to silky pubescent, often symmetrically torn, 1¾-3mm, the lobes ½-2 mm. Corolla sparsely (minutely) stiff hairy towards the outer base, 4-5 mm. Stamens 60-100. Disk glabrous or sparsely pilose. Ovary pubescent to tomentellous or with same indument as calyx, 1-2 mm high; style glabrous or pilose, sometimes with thick conical pilose base. Fruit blue in vivo, ovoid to ellipsoid, sparsely short pilose to glabrous, 8-10 by 5-8 mm; stone lengthwise grooved, at one side with a deep transverse constriction at ¼ from the base. Seed 1, once or twice and then S-shaped curved due to the constriction of the stone.
Both in the lowland and in the hills, from sea-level to 1800 m, in primary and secondary mixed rainforest, not rarely in Dipterocarp forest, along streamsides, on kerangas, in bertam (Eugeissonà) ridge forest. Fl. Oct.-Dec. (once April); fr. Jan.-Dec. Fruit remain white for a long time, then turn through red to light blue when ripe.
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Mixed dipterocarp, kerangas and lower montane forests; mostly on hillsides, often on river banks; growing on yellow, sandy clay loam, limestone and granite rocks; at elevations from 50-1,100 metres.
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