Herbs twining, subglabrous. Stems striate. Petiole 2-7 cm; leaf blade ovate-cordate, 3-13 X 1.7-7.5 cm, base cordate, margin entire or undulate, apex attenuate-acuminate or caudate. Inflorescences (1-)3-7(-20)-flowered; peduncle often shorter than petiole, 1-6.5 cm, angular or narrowly winged; bracts linear, small. Pedicel 3-15 mm, thicker distally. Sepals elliptic, subequal, 5-7 mm, glabrous, distinctly subulate-mucronate. Corolla pink, pale purplish, or occasionally white, campanulate, 1.2-1.9 cm, glabrous; limb 5-lobed, lobes deltate or nearly circular. Stamens included; anthers not twisted. Ovary glabrous. Capsule ± globose, broadly ovoid, or conical-ovoid, 5-14 mm, apex rounded or acute. Seeds ellipsoid-trigonous or oblong-trigonous, 3-8 mm, glabrous, puberulent, scurfy-scaly, or with swollen-based hairs, apex obtuse or acute.
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