Rhombophyllum rhomboideum (Salm-Dyck) Schwantes in Z. Sukkulentenk. 3. 1927 sec. Hartmann 2017
- ≡Mesembryanthemum rhomboideum Salm-Dyck, Monogr. Aloes Mesembr. 3: §6. 1840 syn. sec. Hartmann 2017
- ≡Bergeranthus rhomboideus (Salm-Dyck) Schwantes in Z. Sukkulentenk. 2: 180. 1926 syn. sec. Hartmann 2017
- ≡Rhombophyllum rhomboideum var. rhomboideum syn. sec. The Plant List v. 1.1 2013
- =Mesembryanthemum scapigerum Eckl. & Zeyh., Enum. Pl. Afric. Austral. 3: 309. 1837, nom. illeg., syn. sec. Kew WCVP (2019)
- =Rhombophyllum rhomboideum f. groppiorum Heinrich in Cactus (Paris) 82: 54. 1964, nom. val., syn. sec. Hartmann 2017
- ≡Rhombophyllum rhomboideum var. groppiorum Heinrich ex H.Jacobsen, Sukkulent. Lex.: 522. 1970 syn. sec. Hartmann 2017