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  1. By: Botha, D J - Van Der Schujff, H P
    Type: Article
    In: Journal of South African botany
    Volume: 42
    Issue: 1
    Date: 1976
    Page Range: 57--62
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Von Teichman Und Logischen, I - Robbertse, P J - Van Der Schujff, H P
    Type: Article
    In: Journal of South African botany
    Volume: 43
    Issue: 1
    Date: 1977
    Page Range: 41--56
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa