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  1. By: Marasas, W F O - Van Wyk, P S - Knox-Davies, P S
    Type: Article
    In: Journal of South African botany
    Volume: 41
    Issue: 1
    Date: 1975
    Page Range: 41--45
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Van Wyk, P S - Marasas, W F O - Knox-Davies, P S
    Type: Article
    In: Journal of South African botany
    Volume: 41
    Issue: 4
    Date: 1975
    Page Range: 231--238
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa