Astridia citrina Astridia citrina (L.Bolus) L.Bolus in J. S. African Bot. 32: 230. 1966 sec. Hartmann 20171 wfo-0000554892≡Astridia rubra var. citrina L.Bolus in J. S. African Bot. 27: 170. 1961 syn. sec. Hartmann 20171 wfo-00014350531. Hartmann, H. E. K. 2017 – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: SpringerContent