Evergreen climbing shrub, branchlets angular; leaves 2-3 foliolate, terminal leaflet modified into simple or 3-fid tendril, long coiled, terminating into minute claw; leaflets ovate to oblong, glabrous, rounded at base, entire; flowers vermilion colored, tubular, in pendulous, terminal or axillary, corymbose panicles; calyx cupular, truncate or 5-toothed; corolla bright-orange, tubular, tube long, lobes narrow, oblong-linear, obtuse, recurved; stamens 4, exserted, posterior 2 shorter, staminodes small; disk annular-pulvinate; ovary linear, 4-angled, style long, stigma wide; capsules flat, linear, oblong, acute, compressed, 2-valved, valves smooth, coriaceous; seeds numerous, ellipsoid, thin, winged.