Mesembryanthemum concavum Haw., Saxifrag. Enum. 2: 168. 1821
Mesembryanthemum concavum, Saxifrag. Enum. 2: 168. 1821
is basionym for Tetracoilanthus concavus in Lav. Ist. Bot. Giard. Colon. Palermo 16: 32. 1960
is basionym for Sceletium concavum in Gartenflora 77: 68. 1928