Suffrutescent vine climbing to 10 m; stems terete, glabrous to strigulose in 2 lines. Leaves elliptic, to 11.5 cm long, 4.5 cm wide, apically acuminate to obtuse, basally attenuate, glabrous, the cystoliths prominent on both the surfaces, the margins crenulate to entire; petioles short, 3-8 mm long, glabrous. Inflores-cences in terminal and subterminal panicles, the flowers borne on dichotomously branched panicles, the peduncles puberulous; bracts oblanceolate to 7 mm long, 1 mm wide; pedicels mostly 5-10 mm long, glabrous. Flowers with calyx 5-merous, segments oblong, to 20 mm long, 3.5 mm wide, apically acute, glabrous; corolla white to pale yellow, to 6 cm long, glandular puberulous, tube to 3.5 cm long, 4.5 mm wide at base, narrowing above the ovary, expanding to 5 mm wide at the mouth, the lips to 2.5 cm long, the upper lip erect, to 8 mm wide, apically bidentate, the teeth ca. 1.5 mm long, the lower lip spreading, all the lobes oblong, the middle lobe to 6 mm wide, the lateral lobes 4.5 mm wide, all apically rounded; stamens exserted to near the apex of the upper lip, the anther cells superposed, the lower cell spurred. Capsules clavate, to 15 mm long, 5 mm broad, 4 mm thick, glabrous; seeds near spherical, 3.5 mm diameter, glabrous.
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