What is "disphyma"

Disphyma is a monotypic genus of succulent shrubs. Commonly known as round-leaved pigface, New Zealand iceplant and purple dewplant, it occurs in South Africa, Australia and New Zealand. Its sole species, Disphyma crassifolium, is divided into two subspecies, D. crassifolium subsp. crassifolium and D. crassifolium subsp. clavellatum.