a fleshy annual plant (Portulaca grandiflora) of the purslane family, usually with yellow, pink, or purple flowers
See portulaca in American Heritage Dictionary 4
(pôrˌchə-lăkˈə, pōrˌ-)
noun
Any of various fleshy plants of the genus Portulaca, especially P. grandiflora of South America, cultivated for its showy colorful flowers that open only in sunlight. Also called rose moss.