Shrubs, climbing, 3-5 m tall; petioles and inflorescences sparsely yellow-brown pubescent when young, becoming gray and glabrous. Branchlets grayish green. Petiole 1-4 cm; leaf blade dark brown when dry, elliptic to broadly ovate, 6-13.4 X 4-7 cm, papery, subglabrous to pilose on veins, base broadly truncate-rounded to subcordate, margin entire or irregularly serrulate, apex acuminate to acute; veins 3-6 pairs, ± 3-veined near base. Inflorescences 2-6 X 5-8 cm, branches dichotomous or trichotomous; bracts awl-shaped, 3-6 mm, both surfaces pubescent. Calyx campanulate, 2-3 mm, slightly 2-lipped, 5-dentate, outside pubescent. Corolla white, ca. 4 mm, slightly 2-lipped, 4-lobed, outside densely pubescent especially apically, villous in throat with hairs usually slightly exserted, lower lip 3-lobed, upper lip entire or emarginate. Stamens exserted. Ovary glabrous, glandular. Fruit globose, ca. 4 mm in diam. Fl. and fr. Apr-Jul.
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