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  1. By: De Wet, B C - Germishuizen, G - Schrire, B D - Jordaan, M - Pienaar, B J - Welman, W G - Reid, Christopher S. - Van Wyk, C M - Fish, L. - Immelman, K L - Van Rooy, J - Perold, S M - Taussig, J - Barker, N P
    Type: Article
    In: Bothalia
    Volume: 20
    Issue: 2
    Date: 1990-10-17
    Page Range: 249--266
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-