Hopea pierrei Hance

Medium-sized smooth barked tree, with thin buttresses and sometimes stilt roots. Twig apex fugaceous puberulent, ovary caducously so, petals outside densely cream pubescent, parts otherwise glabrous. Twig c. 1 mm ø apically, very slender, straight, terete, horizontal, dark brown; stipule scars obscure. Leaf bud minute; stipules minute, linear, fugaceous. Leaves 4-8 by 1.6-4 cm, lanceolate, subcoriaceous; base abruptly broadly cuneate; acumen to 12 mm long, slender, caudate; nervation dryobalanoid, main nerves c. 18 pairs with many +-equal secondaries, very slender and hardly evident beneath, obscure above; midrib slender but prominent, terete beneath, obscurely depressed above; petiole 6-11 mm long, slender. Panicle to 2 cm long, slender, axillary or sometimes terminal, singly branched; branchlets to 8 mm long, bearing to 4 pale yellow flowers. Buds to 3 by 2 mm. Sepals broadly ovate, acute to subacuminate. Stamens 15, compressed at base, tapering; appendages very slender, c. 3 x length of the subglobose anthers. Ovary and stylopodium hour-glass-shaped, equal, punctate beneath the short tapering style, with prominent median constriction. Fruit pedicel to 2 mm long, very slender. 2 longer calyx lobes to 27 by 7 mm, small, spatulate, obtuse, c. 1 mm broad above the to 3 by 2 mm ovate saccate thickened base; 3 shorter lobes to 3 by 2 mm, ovate. Nut to 6 by 5 mm, ovoid, shortly apiculate.

Ridges at 300-700 m in Malaya, sometimes locally gregarious (abundant in heath forest in Cambodia, and widespread on sandy soils in evergreen forest in Indochina).

Can be grown by seedlings.