Glabrous. Leaves opposite; lamina narrowly ovate to ovate, 6-16 by 2-6 cm, usually attenuate to cuneate at the base to a petiole 5-10 mm long, attenuate or acuminate and acute or obtuse at the apex, thin and wrinkled and fragile when dry, dull on both sides or very slightly darker and more lustrous above; venation pinnate with the midrib and the main laterals distinct on both sides. Inflorescencess at the nodes, a raceme of 3-6 opposite evenly spaced pairs of triads with all flowers sessile; axis 20-40 mm long; peduncles of the triads 0.5-1.5 mm long, secund.
Asia-Tropical: Lesser Sunda Is. present; Maluku (Maluku present); Sulawesi (Sulawesi present), Bird's Head Peninsula present
Malesia: Celebes, Lesser Sunda Islands, Moluccas, New Guinea (Bird's Head Peninsula).
The inflation of the corolla base may be transient, at anthesis, and not consistently visible. Closely related to Decaisnina sumbawensis and D. zollingeri; for comparison see