Herbs or shrubs, 0.3-1(-2) m tall, branched. Stems 4-sided, densely retrorse hirsute, glabrescent. Petiole (1.5-)2.5-6.5 cm, densely hirsute to setose; leaf blade ovate, oblong-ovate, or broadly elliptic, 7-18 × (2-)3-8.5 cm, papery to submembranous, both surfaces sparsely strigose or abaxially sometimes puberulous, adaxially puberulous and sparsely setose, secondary veins 2 or 3 on each side of midvein, base obtuse to subcordate, margin entire or sometimes inconspicuously denticulate and ciliate, apex acuminate to acute. Inflorescences terminal, umbellate, (3-)5-30-flowered; peduncle 1-1.5(-3) cm, densely hirsute or retrorsely setose. Pedicel 5-10 mm, sparsely hirsute and glandular puberulous. Hypanthium funnel-shaped, 5-9 mm, puberulous and sparsely glandular hirsute. Calyx lobes triangular-ovate, 2-3 mm, densely (glandular) villous. Petals purplish, broadly ovate, 6-9 mm, apex acute. Stamens equal to unequal, longer stamens with filaments 4-5.5 mm; anthers lanceolate, ca. 6 mm; connective decurrent, forming a short spur. Shorter stamens aborted; filaments 3-4 mm; anthers ca. 3 mm. Ovary urceolate, apex with a crown, crown margin puberulous ciliate. Capsule cup-shaped, ca. 7 × 7 mm, 4-lobed; hypanthium 8-ribbed. Fl. Jun-Aug, fr. Dec.
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