Creeping, glabrous (except hair-tufts in the axils of young leaves), slightly succulent, annual herb. Stems rooting, terete, slender, up to 50 cm long, internodes 1½-2 cm. Leaves radical and cauline; pale green, obovate to spathulate, ½-6 ½ by ¾-3 cm, slightly fleshy, narrowed towards the base; margin coarsely scattered-dentate; apex blunt to acute; petiole flattened, ½-4 cm. Flowers solitary, axillary, 7-10 mm long, glabrous; pedicel c. ½-1½ cm long; bracteoles 0. Calyx-lobes lanceolate, 2-3 by ¾-1 mm, acute. Corolla 5-8 mm long, pale yellow, white at base, the margin sometimes violet, and with some brown blotches on the inner side, dorsally slit up to 1 mm from the base, ventral and lateral lobes connate for 5-6 mm, dorsal ones slightly shorter and connate with the lateral ones for 1.5 mm, all lobes with a pair of deltoid, membranous wings at the apex, dorsal lobes moreover with a second wing along the dorsal margin. Stamens 2½-5 mm long, connective acuminate. Ovary inferior, 1-celled, with 8 basally inserted ovules; style 3-5 mm, glabrous; indusium 1 by 1½ mm, ciliate, including the cupular c. 1½ mm high, crenulate stigma. Capsules on up to 2½ cm long, recurved pedicels, slightly flattened-globular, 5-6 mm diam., 2-valved. Seeds 2-6, elliptic, compressed, c. 5-6 by 4 mm.
A weed of dry rice-fields, of heavy, poorly drained clay-flats, in open places, restricted to low altitudes, up to 400 m, in distinctly seasonal regions, often gregarious. Fl. Dec.-Aug., fr. Febr.-May.
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