Gonystylus maingayi Hook.F.

Tree, up to 27 m. Branchlets blackish, thinly ochraceo-puberulous when young, soon glabrescent. Leaves small, very regular in shape and size, elliptic-oblong, 7-12 by 2½-4½ cm (up to 17 by 6 cm in Sumatra), cuneate to rounded at base, narrowed and acuminate at apex (rarely more abruptly cuspidate), chartaceous, strongly shagreened especially above (Sumatran form much less so), glabrous (finely puberulous below when young), midrib thinly puberulous below; nervation close and reticulate, rather widely spreading, conspicuous below, midrib rather deeply channelled above; petiole relatively long and slender, 8-15 by 1-2 mm, ochraceo-tomentellous when young, puberulous later. Inflorescences terminal, up to 14 cm long, rather copiously produced, with numerous short branches, densely tomentelious. Pedicels slender, 8-10 mm. Calyx 4-5 mm long, 5-7 mm diam., densely tomentelious; sepals deltoid, 2-3 mm long, apex subacute to subobtuse, revolute at anthesis. Petals 10-12, triangular-subulate to ovate-acuminate, 2-2½ by up to 1 mm, glabrous, epustulate. Style glabrous. Fruit 3-4 cm long.

Primary rain-forest up to 150 m. Common dominant tree in primary peat-swamps, up to 15 m; fl. Feb., Oct.-Nov., fr Feb., Apr.

Uses. Wood used for planks and boards for domestic buildings (Sabah).

Can be grown by seedlings.