Bacopa

Annual or perennial herbs, glabrous, rarely glandular-pubescent or villous (not in Australia) or with apically sparsely scabrous stems or minutely ciliate sepal margin; stems prostrate or floating, ascending or erect. Leaves cauline, opposite, entire or variously dentate to crenate. Flowers solitary, axillary or in terminal racemes. Flowers sessile to pedicellate. Bracteoles 1 or 2 or absent. Sepals (4 or) 5, basally united, imbricate, dissimilar, the upper 1 largest, the lower 2 next largest, lateral 2 innermost and narrowest. Corolla ± actinomorphic, weakly 2-lipped; upper lip emarginate or 2-lobed, lower lip with 3 subequal segments. Stamens 4(–5), didynamous or equal in length, included in the upper half of the corolla tube; anthers 2-locular ± parallel. Stigma with 2 short broad lobes. Ovary of 2 locules, the placentation axile. Capsule globose, loculicidal and septicidal-septifragal, 2- or 4-valved; numerous seeds, minute, nearly oblong, longitudinally reticulate.