Mesembryanthemum (meaning "midday flowering" in Greek) is a genus of flowering plants native to Southern Africa. Fig marigold or Icicle plant is a name for any of several South African taxa of Mesembryanthemum which are cultivated as ornamental plants for their showy pink or white flowers. "Pebble plant" or "Ice plant" are other but rather ambiguous common names, usually referring to other Aizoaceae.
The plant is characterised by long-lasting clusters of flower heads. Flowers of Mesembryanthemum protect their gametes from night-time dews or frosts but open in sunlight. There is an obvious evolutionary advantage to doing this; where sun, dew, frost, wind or predators are likely to damage exposed reproductive organs, closing may be advantageous during times when flowers are unlikely to attract pollinators.
This post is part of the Floral Friday Fotos meme.