Herbs annual, scandent or twining, with ± grayish hirsute axial parts. Stems 1-2 m. Petiole 1.5-8 cm; leaf blade cordate or deltate-cordate, 4-9.5 3-7 cm, hirsute-villous, base cordate, margin entire, rarely slightly 3-lobed, apex acuminate; lateral veins 6 or 7 pairs. Inflorescences 1-3-flowered; peduncle (0-)3-15 mm; outer 3 bracts linear-lanceolate, small. Pedicel 0.8-1.5 cm. Sepals slightly enlarged in fruit; outer 3 deltate-lanceolate, 8-10 4-5 mm, abaxially grayish hirsute-villous, ciliate, adaxially subglabrous, base auriculate; inner 2 linear-lanceolate, ca. as long as or longer than outer 3. Corolla white, narrowly campanulate, 1.2-1.9 cm; limb shallowly lobed, midpetaline bands pubescent. Stamens ca. 3 mm; anthers ovoid-deltoid, base sagittate. Ovary conical, glabrous. Capsule ± globose, ca. 9 mm in diam., glabrous. Seeds ovoid-trigonous, ca. 4 mm, puberulent to tomentellous, margin sometimes white woolly.
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