Gymnocalycium ×contractum
Gymnocalycium ×contractum in Cact. Phantast. 2019(3)-1: 1. 2019 sec. van der Meer 20191 wfo-0001302928
- ≡Echinocactus ×contractus in Monatsschr. Kakteenk. 1: 15. 1891 syn. sec. van der Meer 20191 wfo-0001288418
- –Echinocactus ×constrictus, nom. inval. syn. sec. The Plant List v. 1.1 20132 wfo-0000660292
- 1. van der Meer, M.H.J. 2019: 11 new nothogenera and 7 new combinations in Cactaceae. – Cactologia Phantastica 3(3): 26–30. 10.5281/zenodo.2557879, 2. TPL