Herbs, 5-50 cm tall. Stems basally prostrate, rooting from nodes, simple or basally branched, villous to subglabrous. Leaves opposite or in whorls of 3 or 4, sessile, ovate-lanceolate, linear-lanceolate, or rarely spatulate, 0.5-5.3 X 0.2-1.5 cm, abaxially villous along veins, adaxially glabrous or sparsely villous, base subamplexicaul, margin serrate; veins pinnate, inconspicuous. Flowers solitary in leaf axils, or in terminal panicles. Pedicel 3-5 mm, villous to subglabrous. Bracteoles ca. 2 mm. Calyx 5-7 mm, villous to subglabrous, with raised veins in fruit. Corolla purple-red, blue, or rarely white, 1-1.5 cm. Capsule compressed, broadly ellipsoid, ca. 5 mm. Fl. and fr. Oct-May.
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An annual herb. The stem is erect and it grows 40 cm tall. It has reddish brown hairs. The nodes are swollen. The leaves are opposite and also in rings of 3-4 leaves. They do not have leaf stalks. The leaves are oval and 1-3 cm long by 1 cm wide. There are small teeth along the edge. The flowers are in the axils of leaves or a the top of the plant. The fruit is an oval capsule 5 mm long.
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