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From The Collaborative International Dictionary of English v.0.48:
Purslane \Purs"lane\, n. [OF. porcelaine, pourcelaine (cf. It. porcellana), corrupted fr. L. porcilaca for portulaca.] (Bot.) An annual plant (Portulaca oleracea), with fleshy, succulent, obovate leaves, sometimes used as a pot herb and for salads, garnishing, and pickling. [1913 Webster] Flowering purslane, or Great flowered purslane, the Portulaca grandiflora. See Portulaca. Purslane tree, a South African shrub (Portulacaria Afra) with many small opposite fleshy obovate leaves. Sea purslane, a seashore plant (Arenaria peploides) with crowded opposite fleshy leaves. Water purslane, an aquatic plant (Ludwiqia palustris) but slightly resembling purslane. [1913 Webster]