Herbs, generally fleshy or succulent, rarely somewhat woody, with alternate or opposite leaves, and regular perfect but unsymmetrical flowers. Sepals commonly 2 (rarely 5). Petals 4 or 5, rarely more, hypogynous, entire or emarginate, imbricated. Stamens hypogynous, equal in number to the petals or fewer, rarely more; filaments filiform; anthers 2-celled, longitudinally dehiscent. Ovary 1-celled; style 2-3-cleft or 2-3-divided, the divisions stigmatic on the inner side; ovules 2-00, amphitropous. Capsule membranous or crustaceous, circumscissile, or dehiscent by 3 valves. Seeds 2-00, reniform-globose or compressed; embryo curved.

About 180 species, mostly natives of America.

Calyx free from the ovary; capsule 3-valved.

Seeds numerous; stamens 5-00.

1.

Talinum.

Seeds not more than 6; stamens 2-5.

Perennials; petals distinct.

Plants with corms or thick rootstocks.

2.

Claytonia.

Plants with bulblet-bearing runners.

3.

Crunocallis.

Mostly annuals; roots fibrous; petals united at the base or distinct.

Petals 3, united at base, unequal, the corolla-tube slit down one side; stamens 3.

4.

Montia.

Petals 5, equal, distinct or very nearly so; stamens 5.

5.

Limnia.

Calyx partly adnate to the ovary; capsule circumscissile.

6.

Portulaca.