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 Systematics, biogeography and utilisation of the Southern African flora 
Description, classification and analysis of the floristic diversity of Southern Africa by focusing on practical problems and significance for utilisation and conservation 
Research Output 
Papers in refereed, published conference proceedings 
Retief E, Van Wyk AE, Van der Merwe CF: 2001. Tapetal orbicules in Southern African boragninaceae. In Proceedings of the 40th Annual Conference of the Microscopy Society of Southern Africa, Microscopy Society of Southern Africa, pp 56-56.  |