Horsfieldia laevigata Warb.

Tree 4-25 m. Twigs faintly ridged or not, 1.5-5 mm diameter, early glabrescent, hairs grey to brown, 0.1-0.2 mm; bark striate, not flaking; lenticels conspicuous or not. Leaves membranous or thin-chartaceous, elliptic to oblong-lanceolate, 10-30 by (3-)4-12 cm, base attenuate, apex acute-acuminate; upper surface drying dull olivaceous to brown, usually minutely pale pustulate or irregularly blotched (as in H. irya), lower surface (largely) glabrescent, hairs 0.1-0.2 mm; dots absent; midrib ± flat above; nerves (10-) 12-30 pairs, slightly raised above, lines of interarching irregular, faint beneath; venation lax, faint or distinct on both surfaces; petiole 5-15 by 1.5-3 mm; leaf bud 10-15 by 1.5-2 mm, with hairs 0.1-0.2 mm. Inflorescences subglabrescent or with dense or sparse scale-like stellate hairs 0.1-0.2(-0.5) mm; in male: 2-4 times branched, many-flowered, 5-20 by 3-10 cm, peduncle 1-4 cm; in female: 2-10 cm long; bracts 2-3 mm long, caducous; flowers (male) in loose clusters of 2-5; perianth 2-lobed, with sparse or dense hairs 0.1-0.2 mm long, pedicel not tapering, generally pubescent, not articulated. Male flowers: pedicel slender, 1.5-3(-4) mm long; buds flattened, subcircular (sometimes slightly longer than broad, or broader than long, e. g., in some specimens from the Papuan Islands; see note 2), 1.7-2.8(-3) by 1.7-3(-3.3) mm, cleft l/2-3/4(-4/5), lobes (0.1-) 0.2-0.3 mm thick; androecium flattened, quadrangular to ± reniform in outline, apex rounded or subtruncate, 1.1-1.5 by l.l-1.8(-2.2) mm (Plate 1: 29); thecae 18-32, erect, free apex up to 0.2 or 0.4-0.6 (var. novobritannica) mm long, column narrowly hollowed for l/4(—1/2) or in var. novobritannica for c. 9/10; androphore to 0.1(-0.2) mm, broadly attached. Female flowers: pedicel 2-2.5 mm long; buds broadly ellipsoid to globose, 2.5-3.1 by 2.8-3.1 mm, cleft 1/3-2/3; ovary ovoid or subglobose, 2-2.3 by 1.7-2.2 mm, hairs 0.1 mm, style to 0.3 mm long, stigma hardly 2-lobed, 0.1-0.2 mm. Fruits (1-) 2-15 per infructescence, ellipsoid or nearly globose, apex rounded to acutish, base rounded, (1.6-)1.8-2.8(-3) by 1.4-2(-2.2) cm, glabrescent but always with minute hairs (0.1 mm) remaining at least at base (lens!), usually with coarse pale tubercles or lenticels; pericarp 2-3 mm thick (or 4-6 mm in some forms from SW New Guinea and New Britain); seeds ellipsoid; fruiting pedicel 3-6 mm long; perianth not persistent.

It is a tropical plant.