n. A herbaceous plant, Portulaca oleracea, widely distributed through warm and temperate climates.n. In America, Sesuvium Portulacastrum, of the warmer Atlantic shores and the saline or alkaline valleys of the southwestern United States, a prostrate fleshy plant, forming mats sometimes 6 feet broad; also, S. pentandrum, sometimes erect, reaching north to New Jersey.n. Ludwigia palustris.n. An American aquatic or sometimes terrestrial herb, Didiplis linearis, of the Lythrarieæ, with opposite linear leaves and very small greenish flowers.