Tree 9-30 m. Twigs 2.5-5(-10) mm diameter, early glabrescent, with grey-brown to light rusty hairs, 0. l(-0.2) mm; bark finely to coarsely striate, not flaking; lenticels small, generally inconspicuous. Leaves membranous or subchartaceous, elliptic-oblong to oblong-lanceolate, 15-30 by 5-13 cm, base narrowly rounded to attenuate, apex acute-acuminate; upper surface drying olivaceous to dark brown, sometimes with whitish marks as in H. irya; lower surface early glabrescent; dots absent; midrib above flat or slightly raised, early glabrescent; nerves 14-21 pairs, above thin, flat or raised, lines of interarching generally indistinct; venation lax, faint on both surfaces; petiole 7-14 by 2-4 mm; leaf bud 8-14 by 2-2.5 mm, with dense (grey-)rusty hairs 0. l(-0.2) mm. Inflorescences mostly behind the leaves, with dense or sparse hairs 0.1-0.2 mm; in male: 3 or 4 times branched, many-flowered, 6-14 by 5-13 cm, peduncle 1-3 cm long; in female: 2-6 cm long, shortly branched; bracts broadly triangular to elliptic-oblong, 2-A(-5) mm long, short-pubescent, caducous; flowers in male in clusters of 5-10 each, in female fewer, glabrous, perianth 3-(or 4-)lobed, pedicel not articulated. Male flowers: pedicel slender, 0.4-0.6 (-0.7) mm long; buds (± depressed-)globose, 1.5-1.8 by 1.5-2 mm; cleft c. 1/2, lobes 0.2 mm thick; androecium (depressed-)globose or broadly ovoid 0.5-0.8 by 0.7-1.1 mm, circular in cross section (Plate 3: 83); thecae 14-20, completely sessile (free apices to 0.1 mm), incurved, apical cavity narrow, (0.1-)0.2 mm deep; androphore rather stout, 0.2-0.4 mm long, completely or partly hidden by the anthers. Female flowers: pedicel 0.5-1 mm long; buds subglobose, 2.3-2.5 mm diameter, cleft 1/3-1/2; ovary ovoid, glabrous, 1.2-1.5 mm diameter, stigma minutely 2-lobed, 0.1-0.2 mm. Fruits 1-3 per infructescence, subglobose to broadly ellipsoid or obovoid, 3.5-6 by 3-4 cm, glabrous, finely granulate, drying bright brown to blackish brown; pericarp (4-) 8-10 mm thick; fruiting pedicel 2-4 mm long; perianth not persistent.
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