Vines woody. Branchlets terete, pubescent. Leaves opposite, simple; petiole 2-7 mm, articulate at middle, pubescent; leaf blade ovate or oblong, 3.5-8.5 × 1.5-4 cm, leathery, glabrous except for vein axils with hair tufts abaxially, base subcordate or rounded, apex acute to acuminate, rarely blunt; primary veins 3-5 on each side of midrib. Flowers solitary or in 2-or 3-flowered terminal cymes; bracts at base of inflorescences leafy, 1.5-2.2 cm, upper ones subulate, ca. 1.5 mm. Pedicel ca. 2 mm or shorter, pubescent. Calyx pubescent; tube ca. 3.5 mm; lobes linear, 4-9 mm. Corolla white; tube ca. 3 cm; lobes 6 or 7, lanceolate, 1-1.4 cm. Fruit not seen. Fl. Aug.
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