Shrubs or shrublets, 20-50(-100) cm tall. Stems pale brown or red, 4-sided, densely spreading pilose with 3-4 mm glandular trichomes. Petiole 2.5-6.5 cm, reddish pilose; leaf blade cordate, ovate-cordate, oblong, ovate-oblong, or elliptic, 4-10(-13.5) × 2-5.5(-10) cm, stiffly papery, abaxially purplish red and only sparsely strigose and puberulous, adaxially sparsely strigose, puberulous, and sometimes white punctate, secondary veins 2-4 on each side of midvein, base cordate, margin double denticulate with each tooth having a terminal seta, apex shortly acuminate to obtusely acute. Inflorescences terminal, umbellate, cymose, or cymose paniculate; peduncle 1-5.5 cm, densely pilose and with long glandular trichomes. Pedicel 0.8-2 cm, densely pilose and with long glandular trichomes. Hypanthium 5-7 mm. Calyx lobes linear-lanceolate to narrowly triangular, 3-5 mm. Petals purple to purplish red, ovate to broadly ovate, 7-14 × 6-8 mm, slightly oblique, outside apically puberulous, margin ciliate, apex acuminate. Longer stamens 1.6-1.8 cm; anthers lanceolate, 7-11 mm, geniculate or slightly curved; connective decurrent, minutely inflated at base. Shorter stamens ca. 1.1 cm; anthers shortly lanceolate, 5-7 mm; connective decurrent, forming a short spur, abaxially tuberculate. Ovary ovoid, apex with a membranous crown, crown margin truncate. Capsule cup-shaped; hypanthium 5-10 × 7-12 mm, setose, apex truncate. Fl. Jun-Aug, fr. Aug-Oct.
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