Bacopa repens (Sw.) Wettst.

Annuals. Stems creeping and rooting at nodes at least basally, branched, 12-20 cm, internodes 3-6 cm, succulent. Leaves sessile, obovate to obovate-lanceolate, 1.2-2.5 X 0.7-1.3 cm, smaller on branches, margin entire; veins 9 or 10, par-allel. Flowers axillary, pendulous. Pedicel 1-2 cm. Bracteoles absent. Sepals (4 or)5, 3-4 mm, margin ciliate, apex obtuse; lower and upper sepals linear-elliptic, 5-veined; lateral 2 sepals linear, 1-veined. Corolla white, almost as long as sepals; lobes obovate, apex rounded; upper lip lobed to middle, lobes narrowly obovate, apex rounded. Stamens equal, ca. 1.2 mm, inserted at throat; filaments as long as anthers; anthers sagittate. Stigma 2-parted; lobes reflexed. Capsule globose, ca. 1.7 mm in diam. Seeds columnar-oblong, ca. 0.5 mm; seed coat reticulate. Fl. Aug-Sep.

Paddy fields; low elevations. Fujian (Fuzhou Shi), Guangdong (Guangzhou Shi), Hainan (Lingshui Xian) [North and South America].

Gratiola repens Swartz, Prodr. 14. 1788; Sinobacopa aquatica D. Y. Hong.

Suampos, ciénagas, márgenes de quebradas, pastizales.

Distribucion en Costa Rica: Humedales en el Pacífico Sur, Central y Norte; y en la vertiente atlántica en elevaciones de 0 a 1.000 m.
Distribucion General: Del sur de México a Argentina.

Hierba.

Hierbas postradas o flotantes, tallos gruesos y esponjosos. Hojas sésiles, obovadas a suborbiculares, de 1-2 por 0,4-1,5 cm. Flores solitarias; pedicelos de 5 a 15 mm de largo, bibracteolados; sépalos de 2 a 3 mm de largo, los exteriores de 2,5 a 3 mm de ancho, los interiores de 1 mm de ancho; corola tubular, blanca y violeta, de 3 a 4 mm de largo. Cápsula de ovoide a globosa, de 2 a 4 mm de largo.

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Bacopa repens là một loài thực vật có hoa trong họ Mã đề. Loài này được (Sw.) Wettst. mô tả khoa học đầu tiên năm 1891.