Lithops olivacea Lithops olivacea L.Bolus, Notes Mesembryanthemum 2: 84. 1929 sec. Cole & Cole 201711. Cole, D. T. & Cole, N. A. 2017: Lithops. – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: Springer=Lithops olivacea var. nebrownii D.T.Cole, Lithops Flowering Stones: 227. 1988 syn. sec. Cole & Cole 201722. Cole, D. T. & Cole, N. A. 2017: Lithops. – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: SpringerContent