A tall liana, up to 20(-30) m. Leaves 1-2-jugate; leaflets ovate to elliptic or oblong-lanceolate, herbaceous to chartaceous, entire or with a few coarse teeth to the top, apex rather blunt to acuminate, (3—)5—13 by (l½-)2½-7 cm; nerves flat above or slightly impressed, prominent beneath; rachis not winged; lateral petiolules 2-8 mm. Racemes on the old wood, the rachis c. ½-7(-13) cm, with usually 6-20 densely set flowers; pedicels 1-2cm. Calyx herbaceous to ± coriaceous, (l¼—)l½—4 cm long, for ¼-½ incised, greenish tinged red to purple-brown, the lobes triangular, blunt to cuspidate, 8-15 by 5-10 mm, midrib prominent or not. Corolla 7-11 cm long including the broad triangular acutish to blunt lobes ¾-l½ by 1-2 cm, the tube pink, rosa or pale carmine, the lobes creamy to yellowish, sometimes streaked with purple lines, or pink all over, inside near the insertion of the stamens stuppose-hairy. Anthers c. 4 mm long, divaricate. Capsule almost cylindric, stiped and beaked, 17-22(-30) by 3-3¾ by 3 cm, with hard, almost woody, boat-shaped valves. Seeds including the thin wing 2½-3½ by 1¼-1½ icm.
In swampy or dry rainforests, sometimes riverine forest, once on limestone, from sea-level up to c. 1500 m. Fl. April-Dec; fr. June-Nov.
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