Tree, up to 30 m, 60 cm dbh. Nodal glands elliptic, 0.3-0.6 mm long. Petiole 3.5-5 mm, indistinctly transversely wrinkled. Leaf-blade (4-)6-9 by 1—2.5(—3.5) cm, apex gradually acuminate; above brownish green, midrib sunken; beneath concolorous, secondary nerves c. 6-8 pairs, forming an intramarginal nerve; glands (2—)4—8(—15), present in middle and apical part, absent from margin itself but (in Sumatran coll.) rather close to the margin, or (in Bornean coll.) rather closely together and not near the margin, 0.3-0.6 mm diam. Inflorescences up to 3 cm long; nodal glands elongate, usually very distinct. Pedicel c. 5 mm, sparsely minutely woolly hairy. Sepals minutely hairy inside; outer sepals c. 3.1 by 2.3 mm; inner sepals 3.5-4.3 by 2.3-2.8 mm. Petals yellowish brown when dry, the longest one 6-6.5 mm long; carina inside minutely hairy above base, upper petals minutely hairy inside. Stamens: filaments minutely hairy in basal part; anthers 0.6 mm long, glabrous. Ovary 0.5-0.7 mm stipitate, glabrous; style glabrous or only at base very sparsely minutely hairy; ovules 8-12. Fruit globular, up to 0.9 cm diam., yellowish to greenish brown, smooth, dull; pericarp thin; pedicel 4-5.5 mm.
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