Tree 10-18 m. Leaves thinly chartaceous, extremely brittle when dry, oblong(-lanceo-late), (9—)13—18 by (3.5-)4-7.5 cm, base attenuate, apex ± short-attenuate or acute-acuminate; Male and female inflorescences and flowers not known (but see the note). Fruits subglobose or ellipsoid, glabrous, drying (blackish) brown, somewhat wrinkled and at most with few wart-like lenticels, 5.5-8(-9) by 4-6.5 cm;
Asia-Tropical: Borneo present (Sabah present, Sarawak present), E Kalimantan present
Malesia: Borneo (E Kalimantan, type; probably Sarawak and Sabah, see specimens discussed by De Wilde, I.e.).
Horsfieldia discolor is known only in fruit, and characterized by the pale colour of the young twigs that contrasts with the dark brown or blackish dry petioles. It is closely related to H. obscura, known only from two male flowering specimens which differ in the twigs turning brown on drying, and densely set with rather conspicuous lenticels. In H. discolor lenticels are almost absent, or in some tentatively included j specimens few to abundant, but they are never conspicuous. Furthermore, H. obscura j occurs on limestone, whereas H. discolor seems associated with sandstone and alluvial soils.