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  1. By: Botha, C E J - Bornman, Chris H - Addicott, Fredrick T
    Type: Article
    In: Journal of South African botany
    Volume: 39
    Issue: 3
    Date: 1973
    Page Range: 213--227
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: De F., B - Botha, C E J - Bornman, C H - Carter, Mary - Heeg, J
    Type: Article
    In: Journal of South African botany
    Volume: 38
    Issue: 3
    Date: 1972
    Page Range: 195--203
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa