Aquatic herbs, floating or prostrate on mud, sometimes ascending, sparingly branched, the stems stout, soft, hirsute with slender, sturdy uniseriate hairs, the basal cell enlarged, and with scattered globose sessile glands, sometimes rooting at the nodes, the roots fibrous. Leaves opposite, often subtended by tufts of white hairs, rotund or broadly ovate, apically obtuse or round, to 1.5 cm long and 1.2 cm wide but often much smaller, basally truncate or subcordate with auricles clasping the stem, the margins entire, often ciliate, the surfaces glabrous or with long hairs, palmately many nerved; petioles obsolete, punctate with brownish orange glands. Inflorescences of solitary flowers in the axils of the leaves, often geminate, the pedicels slender, hirsute, exceeding the leaves; ebracteate. Flowers with the sepals free to the base, the outer 3 broad, ca. 6 mm long and 5 mm wide, apically obtuse or emarginate, basally truncate or sub-cordate, the costa and the margins ciliate, many nerved, the inner 2 sepals nar-rowly deltoid, costate, glandular, slightly shorter than the outer sepals, hirsute outside,-glabrous within; corolla blue or white, slightly exserted, ca. 7 mm long, 4-lobed, the upper lobe emarginate; stamens 4, the filaments glabrous, ca. 1 mm long, inserted near the top of the tube, the anthers linear, ca. 1.5 mm long, the thecae versatile, medifixed, connate along /2, free but proximal along the other /2; the ovary narrow, 1 mm long, glabrous, sulcate, the style terete, distinct, 3 mm long, apically curved, the stigma capitate, convoluted and slightly 2-lobed. Capsule ca. 3 mm long; seeds numerous, oblong, ca. 0.5 mm long, longitudinally reticulate, reddish brown.
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