Ruschia laxa Ruschia laxa (Willd.) Schwantes in Natl. Cact. Succ. J. 4: 58. 1949 sec. Hartmann 20171≡Mesembryanthemum laxum Willd., Enum. Pl.: 536. 1809 syn. sec. Hartmann 201711. Hartmann, H. E. K. 2017 – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: SpringerContent