A prostrate or suberect, much branched herb roothing at nodes. Leaves (3-) 4 in a whorl, unequal, petiole 1-5 mm long; lamina thin, elliptic-ovate to oblanceolate, 2-6 (-8) x 1-2.5 (-3) cm, entire or minutely denticulate, apex acutely apiculate, puberulous above, hairy on nerves below, basally attenuate. Inflorescence usually an axillary cluster of 2-3 flowers, 1-1.5 cm long or solitary. Flowers white to purplish-pink, 1.2-1.8 cm long; bracts in 4 opposite paris, broadly spathulate-obovate 7-8 x 2-4 mm, apex obtuse with up to 4 mm long stiff, reflexed hairy, slender bristles on margins and apex; bracteoles spathulate with 2-5 mm long hairy bristles. Calyx 4-lobed, lobes unequal, ciliate margined, outer lobes 1-1.5 cm long, inner ones 7-8 mm long, all sharp-pointed. Corolla tube urceolate, c. 4 mm long, pubescent, upper lip absent, lower lip c. 1.2-1.4 cm long, obscurely lobed. Stamens 4, filaments c. 4.5 mm long, glabrous, anthers oblong, c. 3 mm long. Style c. 7 mm long. Capsule ovoid, 6-7 mm long, shining. Seeds 2, ± orbicular, flattened, c. 4 x 3.5 mm.