Ruschia rigidicaulis (Haw.) Schwantes in Natl. Cact. Succ. J. 4: 58. 1949 sec. Hartmann 2017
- ≡Mesembryanthemum rigidicaule Haw., Saxifrag. Enum. 2: 116. 1821 syn. sec. Hartmann 2017
- –Mesembryanthemum rigidicaule Eckl. & Zeyh., Enum. Pl. Afric. Austral. 3: 310. 1837, nom. inval., syn. sec. Berendsohn 2023