Glabrous except for a short red-brown tomentum on the young shoots, inflorescences and flowers in some Bornean specimens. Leaves scattered or sometimes subverticillate; lamina broadly elliptic to obovate, 5-10 by 2-6.5 cm, cuneate at the base to a petiole 5-15 mm long, obtuse or rounded at the apex, dull or slightly glossy above, dull below; venation pinnate with the midrib distinct below and the many parallel secondary and tertiary veins obscure but forming a finely striate pattern above. Inflorescencess at the nodes, a 3-16-flowered raceme or spike; axis 20-60 mm long; pedicels 0-4.5 mm long, up to 2 mm thick; bracts simple, ovate, c. 2 mm long. Ovary cylindric, 5-7 mm long; calyx limb spreading, c. 1 mm long. Corolla in mature bud 5-merous, 17-22(-28) mm long, inflated up to 4 mm wide at the base, gradually narrowed upwards, robust, acute at the apex, yellow to green or pale orange brown. Anther 5-6 mm long, acute, almost as long as the free part of the filament. Style 16-25 mm long, reaching beyond the top of the anthers, slender, lacking a constriction, angular; stigma not wider than the style.
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