Mesembryanthemum

noun

1. South African annual or biennial plants having flowers that open only in bright sunlight

   noun.plant

   Synonyms genus mesembryanthemum

   Source: WordNet 3.0

2. A genus of herbaceous or suffruticose plants, chiefly natives of South Africa. The leaves are opposite, thick, and f&?;eshy. The flowers usually open about midday, whence the name.

   noun

   Source: webster1913