Shrub or tree, 3-20 m, up to 20 cm dbh. Twigs glabrous to minutely patently hairy, mostly soon glabrescent; axillary region shortly densely patently hairy. Axillary buds 2-4, usually less than 0.5 mm long, mostly very densely patently hairy, the upper one sometimes slightly supra-axillary. Petiole 3—9(— 11), exceptionally up to 14 mm, glabrous to shortly rather densely hairy in the upper groove, rarely (in some Sumatran coll.) shortly hairy all round; glands mostly indistinct. Leaf-blade rarely linear-lanceolate, (2.5-)3.5-15(-18) by (l-)2-5 (-7) cm, apex acuminate to cuspidate; above sometimes slightly bullate between the secondary nerves, greyish green, midrib slightly sunken or sometimes flat to slightly prominent; beneath rather dull, mostly glabrous, yellowish green, secondary nerves 3-5 (or 6) pairs, forming a rather distinct intramarginal nerve; glands (0—)2—7(—11), 0.1-0.3 (-0.4) mm diam. Inflorescences solitary or with 2 together, mostly unbranched or sometimes with a few short side axes at base; axes angular to terete, minutely hairy; flowers solitary or in basal part with 3 together; bracts and bracteoles relatively long-persistent. Pedicel (1—)2—4(—7.5) mm, densely minutely hairy. Sepals: outer sepals 1.6-2.3 by 1.4-2.3 mm; inner sepals 2.6-3.6 by 2-3.3 mm. Petals: white, when dry yellowish, the longest one 7-8.5(-9) mm; carina mostly bent outwards in open flowers, thus exposing the stamens, rather densely appressedly hairy outside, inside minutely hairy in apical part, ciliate in basal half; other petals glabrous to sparsely hairy outside at apex. Stamens: anthers (0.4-)0.5 mm long. Ovary (sub)sessile, more or less ribbed, more or less appressedly hairy with hairs of different length; ovules 4. Fruit globular to broadly ellipsoid, sometimes irregularly 2-4-sulcate, 1.2-1.8 cm diam., more or less smooth to strongly warty, light brown, velvety to densely appressedly hairy.
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