Shrubs or shrublets, to 1 m tall, erect or climbing. Stems 4-sided when young, later terete, closely spreading setose to hirsute, trichomes glandular. Petiole 1.3-4.5 cm, patently setose with glandular trichomes; leaf blade ovate, oblong-ovate, or elliptic, 2-11 × 2-5 cm, papery, abaxially puberulous and rarely setose on veins and otherwise glabrous, adaxially rarely strigose among veins, secondary veins 3 or 4 on each side of midvein, base rounded to cordate, margin serrulate, apex obtusely acuminate. Inflorescences terminal, cymose paniculate, 5-14 × 3-7 cm, patently setose with glandular trichomes. Pedicel 0.8-1.2 cm, glandular setose. Hypanthium turbinate, ca. 3 mm, 4-sided. Calyx lobes triangular, villous. Petals white or lavender, ovate-orbicular to oblong, 8-11 × 4-5(-6) mm, slightly oblique, outside slightly with glandular trichomes, apex shortly acute to acuminate. Longer stamens 1-1.2 cm; anthers lanceolate, 6-7 mm, tuberculate at base; connective decurrent, forming a short spur. Shorter stamens ca. 6.5 mm; anthers 2.5-3 mm, conspicuously tuberculate at base. Ovary half inferior, ovate. Capsule cup-shaped to turbinate; hypanthium 4-5 × ca. 5 mm, 4-sided, with glandular trichomes, apex truncate. Fl. Oct-Nov, fr. Nov.
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