We use standard references for the Mesembryanthaceae, which are mostly from South Africa and Namibia. Among the most important references are:
Hammer, S.A., 2010, Lithops, Treasures of the Veld: British Cactus and Succulent Society, UK.
Hartman, H.E.K., 2001,
Illustrated Handbook of Succulent
Plants: Aizoaceae A-E and F-Z: Springer-Verlag,
Berlin, Germany.
Smith, G.F., and others, 1998, Mesembs of the World: Briza Publications, Pretoria, South Africa.
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