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  1. By: Van Der Merwe, Phillip - Grobler, P J
    Type: Article
    In: Journal of South African botany
    Volume: 34
    Date: 1968
    Page Range: 31--35
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Ogawa, Kyoichi - Van Der Merwe, Phillip
    Type: Article
    In: Journal of South African botany
    Volume: 41
    Issue: 2
    Date: 1975
    Page Range: 87--90
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa