龙须海棠属（学名：Mesembryanthemum）是番杏科下的一个属，为肉质、旱生植物。该属共有1000种，主要分布于非洲南部。

Mesembryanthemum (meaning "midday flowering") is a genus of flowering plants indigenous to southern Africa. Many species formerly placed herein, such as Dorotheanthus bellidiformis, Carpobrotus and Sceletium have since been moved into other genera.

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. In Afrikaans, "Mesembryanthemums" are known as 'vygies', although this term also refers to many plants in the family Aizoaceae.