me·sem·bry·an·the·mum /məˌzɛmbriˈæn(t)θəməm/
  Me·sem·bry·an·the·mum n.  Bot. A genus of herbaceous or suffruticose plants, chiefly natives of South Africa.  The leaves are opposite, thick, and fleshy.  The flowers usually open about midday, whence the name.
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  Mesembryanthemum
       n : South African annual or biennial plants having flowers that
           open only in bright sunlight [syn: genus
           Mesembryanthemum]