Herbs 13-21 cm. Stems 4-sided, narrowly winged on angles, margin of wings with sparse glandular trichomes or setose, otherwise glabrous. Petiole 0.5-2 cm, laterally narrowly winged, margin of wings sometimes with sparse glandular trichomes; leaf blade ovate to sublanceolate, (2.5-)5-8.5 × (1-)2-3.5 cm, papery, abaxially sparsely strigose on veins, sometimes bullate, adaxially strigose, secondary veins 1 on each side of midvein, margin serrate with each tooth having a terminal seta. Inflorescences terminal cymes, 3-5 cm; peduncle 1.5-3 cm. Pedicel 3-5 mm, 4-sided, narrowly winged on angles, margin of wings sometimes with sparse glandular trichomes. Hypanthium narrowly funnel-shaped, ca. 5 mm, 4-sided, winged on angles, margin of wings with sparse glandular trichomes. Calyx lobes broadly triangular, apex acuminate with an aristate tip. Petals pink, oblong, ca. 7.5 × 3 mm, apex acute. Longer stamens ca. 1.6 cm; anthers oblong-linear, ca. 7 mm. Shorter stamens ca. 6 mm; anthers oblong, ca. 2 mm. Ovary narrowly ovate, apex truncate and with a 4-lobed membranous crown; hypanthium 3-4 × 2-2.5 mm, 4-sided, 8-veined, with sparse glandular trichomes. Fl. Aug, fr. Sep-Oct.
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