Annual; stems glabrous, procumbent or ascending, not rooting at nodes. Lvs ± glabrous; petioles c. 5-20 mm long; leaflets obovate, acute to obtuse, mucronate, cuneate at base, finely serrate, c. 3-12 mm long; lateral veins thin and straight or slightly recurved and thickened toward leaflet margin; petiolules < 1 mm long, ± equal; stipules ovate, acuminate. Infls axillary, spicate, globose, sessile or shortly pedunculate, mostly remote; fls numerous, sessile or subsessile, remaining ± erect at fruiting; bracts subtending fls free. Calyx glabrous, with 10-12 very distinct veins, not inflated at fruiting; throat open, glabrous; calyx teeth subequal, < corolla, ovate, acuminate, < tube, strongly recurved at fruiting; sinuses acute. Corolla pink to purplish, persistent, 3-5 mm long. Pod glabrous, straight, < calyx, 2-3 mm long, 1-2-seeded; seeds c. 1 mm diam.