Glabrous except for the young parts shortly and densely tomentose. Leaves subopposite, scattered or spirally arranged; lamina lanceolate to elliptic, 5-8 by 1.5-2.5 cm, attenuate or cuneate at the base to a slender petiole 8-16 mm long, attenuate and acute to shortly rounded at the apex, glossy above, dull below; venation pinnate with the midrib distinct and raised on both sides and the secondary and tertiary veins obscure but numerous and more or less parallel at c. 45° to the midrib. Inflorescences at the nodes and also terminal on short leafy shoots, a 1- to 8-flowered raceme; axis 5-70 mm long, distinctly angular; pedicels 25-40 mm long, strongly winged, widened upwards and 3-5 mm wide at the apex. Ovary narrowly cylindric, 5-7 mm long; calyx limb c. 1 mm long, erect, irregular at the margin.
Asia-Tropical: Sumatera (Sumatera present)
Malesia: Sumatra, known only from Mt Singgalang.