Tree 4-10 m. Leaves chartaceous-coriaceous, rarely ± membranous, (elliptic-)oblong, 13-35 by 5-11 cm, base long- or sometimes short-attenuate, apex acute-acuminate; Inflorescences with dense to sparse hairs 0.1 mm or less; Fruits 2-11 per infructescence, ellipsoid, 1.6-2 by 1.2-1.5 cm, glabrous, drying brown, the surface finely granulated;
Asia-Tropical: Borneo present (Brunei present, Sabah present, Sarawak present), Mt Klam present, W Kalimantan present
Malesia: Borneo (Sarawak, Brunei, Sabah; W Kalimantan: Mt Klam).
Horsfsieldia carnosa is a well-characterized species, a small tree of kerangas or peat swamp forest, on white sandy soils. It is distantly related to H. glabra, which is distinguished by a less stout habit, dark twigs, bark not tending to flake, smaller and usually membranous leaves, globose male flowers, pedicels ± articulated, globose or ellipsoid androecium with short androphore, and somewhat longer, not densely clustered fruits, 1.8-2.4 cm long.