Tree 5-10 m. Twigs flattened 2-angular, lower down terete with two ridges, 3—6(—13) mm diameter, at first with bright rusty hairs 0.3-0.5(-0.8) mm long, early glabrescent; bark smooth to striate, distinctly lenticellate, not flaking. Leaves membranous, (elliptic-)oblong, 20-40 by 5.5-15 cm, base nearly rounded to attenuate, apex acute-acuminate; upper surface drying olivaceous to blackish brown, finely minutely paler pustulate or not, lower surface early glabrescent except for some indumentum remaining on the midrib, hairs coarse 0.3-0.5 mm; dots absent; midrib fairly broad, flattish above; nerves 18—28 pairs, slender above, flattish, lines of interarching regular and distinct beneath; venation lax, inconspicuous; petiole 13-16 by 3-4.5 mm; leaf bud 10-20 by 3-4 mm, with hairs 0.3-0.8 mm long. Inflorescences thinly with stellate-dendroid hairs 0.3 mm; in male: 3 or 4 times branched, rather many-flowered, broadly pyramidal, 7-16 by 6-14 cm, peduncle 0.5-l(-2) cm long; in female: 4-8 cm long; bracts broadly ovate, pubescent, 3-4 mm long, caducous; flowers (male) solitary or 2-4 together, perianth 2-lobed, glabrous, pedicel sometimes at first with sparse hairs, slender, not articulated. Male flowers: pedicel 1-2(-4) mm; buds transversely ellipsoid or reniform, moderately laterally compressed, drying dull, more or less collapsed on drying or not, 2.5-3 by 4-4.5 mm, below sometimes with a basal sinus, cleft 4/5-5/6, the lobes 0.2(-0.3) mm thick; androecium broadly transversely ellipsoid, slightly laterally flattened, hollow, 1.5 by 3-3.5 mm (Plate 1: 8); thecae (36-)40-48, connate for about halfway, forming a cup with the anthers from one side deeply inflexed, those from the other side for a large part overarching the former; anthers sometimes slightly sagged at base, hiding the narrow androphore, 0.2-0.3 mm long. Female flowers: pedicel 2(-2.5) mm long; buds subglobose-ovoid, 2.5 mm diameter, cleft c. 1/2; the ovary broadly ovoid-subglobose, 1.5-1.7 mm diameter, glabrous, stigma consisting of 2 minute sessile lobes 0.1-0.2 mm. Fruits 2-6 per infructescence, broadly ellipsoid to subglobose, 20-25 by 17-20 mm, glabrous (or possibly with few minute hairs at base), finely rugulose, without marked tubercles, drying (reddish) brown; pericarp 1.5-2 mm thick; fruiting pedicel 3-6 mm long; perianth not persistent.
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