Perennial; stems glabrous, erect or ascending, not rooting at nodes. Lvs glabrous; petioles c. 10-100 mm long; leaflets elliptic to obovate, usually obtuse, cuneate at base, finely serrate, c. 10-35 mm long; lateral veins thin and straight to leaflet margin; petiolules up to c. 1 mm long, ± equal; stipules ovate, acuminate. Infls axillary, racemose, globose, pedunculate, > lvs; fls numerous; pedicel up to 6 mm long; bracts subtending fls free. Calyx glabrous or sparsely hairy, 10-veined but 5 veins often indistinct, not inflated at fruiting; throat open, glabrous or sparsely hairy; calyx teeth somewhat unequal (2 upper slightly longer), < corolla, narrowly triangular, usually much > tube, sometimes only slightly >, erect at fruiting; sinuses obtuse. Corolla usually pink, persistent, 5-10 mm long. Pod glabrous, straight, ± = calyx, 3-4 mm long, 1-4-seeded; seeds c. 1-1.5 mm diam.