Tree 10-20 m. Leaves membranous to chartaceous, elliptic-oblong to oblong-lanceolate, 15-35 by 5-11 cm, base short-attenuate to narrowly rounded, apex acute- acuminate; Inflorescences behind the leaves, with shaggy rusty hairs 0.5 mm; Fruits 1-3 per infructescence, ellipsoid, apex and base rounded, 7-8 by 4.5-5 cm, glabrous, drying dark brown, finely to coarsely tubercled, pericarp 15 mm thick;
Asia-Tropical: Borneo present (Sabah present), Mt Kinabalu present
Malesia: Borneo (Sabah: Mt Kinabalu).
2 The pedicels are generally not articulated, although some flowers of SAN 18843 seem to have an articulation, but this may be an artefact caused by drying. 1 Close to H. montana, both having very similar male flowers, but H. amplomontana differs considerably by its stouter twigs, larger leaves, larger male inflorescences, and very much larger fruits with a thick pericarp; in H. montana the fruit is only 2-2.7 cm long, and the perianth is not persistent.