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Usually prostrate annual and perennial herbs. Leaves opposite, petiolate, lanceolate or oblanceolate, narrowly to broadly elliptic or ovate, entire, slightly succulent. Stipules absent. Flowers axillary, glomerulate, subsessile, hermaphrodite, regular. Calyx gamosepalous, 5-lobed; tube short; lobes membranous-margined, coloured inside, green outside, and with a subapical dorsal mucro. Stamens 5–15, free, inserted in the upper part of the calyx-tube. Ovary superior, syncarpous, 2-celled, of 2 united carpels; stigmas 2, free; ovules 2 per cell, attached to the interlocular septum. Fruit a four-seeded capsule, dehiscing by means of a bivalved operculum, the valves usually separating.
Leaves opposite, petiolate, lanceolate or oblanceolate, narrowly or broadly elliptic or ovate, entire, slightly succulent, without stipules.
Ovary superior, 2-carpellate, syncarpous, 2-celled with 2 free stigmas and 2 ovules per cell attached to the interlocular septum.
Perianth a short tube with 5 membranous-margined lobes, these coloured inside, green outside and with a subapical dorsal mucro.
Fruit a 4-seeded capsule, dehiscing by means of a 2-valved operculum.
Stamens 5, free, inserted in the upper part of the perianth tube.
Flowers axillary, in groups, ± sessile, hermaphrodite, regular.
Usually prostrate annual or perennial herbs.
