Horsfieldia olens W.j.de Wilde

Tree 10-35 m. Twigs 2-4 mm diameter, quadrangular by ridges from both sides of the petiole bases (lower down ridged or lined), early glabrescent, hairs greyish or brown 0.1 mm; bark striate, not flaking; lenticels usually distinct. Leaves chartaceous, oblong (-lanceolate), 7-14 by 2.5-6 cm, base attenuate, apex rounded, obtuse, or bluntly short-acute-acuminate, upper surface brown to blackish on drying, sometimes with few minute whitish dots or pustules; lower surface early glabrescent, hairs minute, 0.1 mm or less; dots absent but irregularly shaped pustules of a different nature present; midrib raised above; nerves 7-10 pairs, above and below thin, flattish, inconspicuous, lines of interarching regular, thin; venation lax, faint on both surfaces; petiole 12-20 by 1.5-2 mm; leaf bud 6-10 by 1.5 mm, with hairs 0.1 mm long. Inflorescences glabrescent or with sparse hairs 0.1-0.2 mm, short and stout, 2 or 3 times branched, peduncle 0.1-1 cm long, rather many-flowered; in male and female (according to the infructescence): 2-6 by 1.5-4 cm, bracts not seen, caducous; flowers (male) in loose clusters of 3-5(-7), glabrous; perianth 3-(or 4-)lobed, pedicel slender, ± articulated or not. Male flowers: pedicel 2.5-4 mm long; buds broadly ellipsoid to globose, not angular, 1.8-2.3 mm diameter, cleft c. 5/6 or nearly to the base, lobes 0.2 mm thick; androecium ± obovoid, blunt-triangular in cross section, 1.5 by 1 mm (hence not filling the perianth) (Plate 1: 72); thecae 20-24, free apices 0.3-0.8 mm, incurved, those of one side clasping the others; column broad, hollowed for 1/4 to 1/3; androphore broad, up to 0.1 mm long. Female flowers not known. Fruits 2-6 per infructescence, ellipsoid, 1-1.6 by 0.8-1.2 cm, apex minutely pointed, base subattenuate, glabrous, without or with sparse small tubercles or lenticels; pericarp 1-1.5 mm thick; fruiting pedicel 1-4 mm long; perianth not persistent.

It is a tropical plant.