From The Collaborative International Dictionary of English v.0.48:

Portulaca \Por`tu*la"ca\, n. [L., purslane.] (Bot.)
   A genus of polypetalous plants; also, any plant of the genus.
   [1913 Webster]

   Note: Portulaca oleracea is the common purslane. {Portulaca
         grandiflora} is a South American herb, widely
         cultivated for its showy crimson, scarlet, yellow, or
         white, ephemeral blossoms.
         [1913 Webster]
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