Large pale-barked semi-deciduous tree. Leaf buds, stipules outside and ovary apex densely persistently long rufous silky velutinate, twigs, leaf nervation beneath and midrib above, inflorescence and calyx caducously ± sparsely so. Twig 10-15 mm ø apically, stout, pale brown, rugose, lenticellate; internodes short, the leaves densely clustered at the ends of the twigs. Buds to 25 by 15 mm, large, ovoid-lanceolate, acute; stipule to 15 by 2.5 cm, lanceolate, subacute. Leaves 16-40 by 7.5-14 cm, large, narrowly ovate to elliptic, coriaceous; base broadly cuneate to subcor-date; acumen to 5 mm long, short, broad, tapering; nerves 24-30 pairs, ascending, slender but prominent beneath as also the midrib; petiole 4-6 cm long, to 4 mm ø, relatively slender. Inflorescence to 16 cm long, axillary, straight, borne in dense clusters behind the leaves, each bearing to 6 distichous flowers. Flower buds to 5 by 1.3 cm long, fusiform. Stamens c. 30, exceeding style at anthesis; filaments slender, tapering, ± equal to the shortly lorate tapering distally fimbriate anthers; appendage acicular, somewhat shorter than anthers; ovary narrowly ovoid, surmounted by a slender columnar style c. its length. Fruit pedicel to 3 mm long; calyx tube to 4 by 3 cm, ellipsoid, with 5 narrow ribs running from the apex for 1.5 its length; 2 longer lobes to 20 by 5.5 cm, oblong-oblanceolate, obtuse, c. 8 mm wide and somewhat revolute at base; 3 shorter lobes to 15 by 6 mm, ovate, subacute, revolute.
Semi-evergreen forest, often in gallery forests along streams, on swamp edges or in narrow valleys at low elevations. Also found as a canopy or emergent tree in moist evergreen forests.
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Semi-evergreen Dipterocarp forest and Schi-raa-bamboo forests at low elevations in the seasonal zone, in moist sandy soil in valleys by streams but not normally alluvium.
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