1. Trianthema L. (sea purslane)

Twenty to 25 species, nearly worldwide, mostly in tropical and warm-temperate regions.

Barker (1986) reported Sesuvium verrucosum Raf. from Missouri without citation of a locality or voucher specimen. This species is native to Africa and Australia and occurs as a weed in disturbed areas with saline soils from the southwestern United States eastward to Kansas, Oklahoma, and Texas. The genus Sesuvium differs from Trianthema in its ovaries with 3–5 locules, 3–5 styles, and numerous ovules, as well as its leaves lacking expanded stipular bases.