Description from Flora of China
Herbs, 7-15 cm tall, little branched; stems prostrate and rooting or with apices ascending, densely strigose to villosulous. Leaves opposite, markedly anisophyllous, in larger leaf of a pair petiole 3-8 mm, villosulous; blade drying papery and pale abaxially, elliptic, elliptic-oblong, or broadly ovate, 10-40 × 7-20 mm, adaxially sparsely strigose to hispid along midrib and near margins, abaxially glabrous on lamina and densely strigose to hispid along veins, base cuneate to obtuse, margin serrate-ciliate, apex acute to obtuse; secondary veins 4-6 pairs; smaller leaf of a pair subsessile, suborbicular or broadly ovate, 5-10 mm; stipules persistent, ovate, suborbicular, or obovate, 2-6 mm, glabrescent, ciliate. Inflorescences 2- or 3-flowered, strigose to hispid; peduncles 5-20 mm; bracts triangular to linear, 1-3 mm; pedicels 10-25 mm. Calyx pilosulous or strigillose; hypanthium portion obconic, 1-1.5 mm; lobes 5, triangular to lanceolate, 1.5-2 mm. Corolla white, rotate, glabrous; tube ca. 2 mm; lobes 5, lanceolate, 6-7 mm, ciliate. Stamens 5; anthers coherent, dehiscent by longitudinal slits, with connective prolonged. Capsules subglobose or obovoid, ca. 3 mm in diam. Fl. Mar-May, fr. Sep-Oct.
● Dense forests; 500-1500 m. Hainan.