Horsfieldia leptantha W.j.de Wilde

Tree 8-30 m. Twigs 4-8 mm diameter, early to late glabrescent, hairs rusty, 0.5-1 mm long; bark finely or coarsely striate, not flaking; lenticels usually present. Leaves membranous to chartaceous, elliptic to oblong-lanceolate, 13-35 by 5-13.5 cm, base (short-) attenuate, apex acute-acuminate; upper surface drying dull olivaceous, smooth or finely pustulate, lower surface early or late glabrescent, or with persistent stellate-dendroid woolly or mealy hairs of mixed size, 0.5-1 mm long, when shed not leaving rough hair bases; dots absent; midrib above flattish, glabrescent except towards base; nerves 10-20(-30?) pairs, at 45-50° to the midrib, 5-20 mm apart, thin and sunken above, lines of interarching irregular, prominent or not below; venation lax, distinct or not; petiole 5-12 by 2.5-4 mm; leaf bud 2.5-5 cm long, with dense hairs 0.5-1 mm long. Inflorescences with woolly hairs 0.5-1 mm long; in male: rather many-flowered, 2 or 3 times branched, 11 by 7 cm, peduncle 0.5-2 cm long; bracts broadly elliptic, obtuse, 2-3 mm long; flowers in loose clusters of 2-6, with hairs 0.2-0.3(-0.5) mm long; perianth 2-lobed, pedicel slender, not articulated. Male flowers: pedicel 1-1.5 mm long; buds somewhat compressed, in lateral view subcircular, 2.5 by 2.7-3 mm, membranous, not collapsing on drying, cleft 3/4-5/6, lobes 0.2 mm thick; androecium compressed, 1-1.3 by 1.3-1.6 mm, apex broadly rounded-truncate (Plate 2: 37); thecae 20-28, erect, touching each other, 1-1.1 mm long, free apices 0.2-0.3 mm, not or faintly incurved, column narrowly hollowed for 0.3 mm; androphore ± absent. Female flowers not seen. Infructescences 6-12 cm long, branched. Fruits 2-8 per infructescence, broadly ellipsoid to subglobose (seeds ellipsoid), 2-2.4 by 1.6-2 cm, largely glabrescent but with minute vestigial hairs towards the base, tubercles coarse, pale, lenticel-like, pericarp woody-coriaceous, 4-7 mm thick; fruiting pedicel 5-10 mm long; perianth not persistent.

It is a tropical plant.