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  1. By: Adamson, R S - Esterhuysen, E - Phillips, E P
    Type: Article
    In: Journal of South African botany
    Volume: 9
    Date: 1943
    Page Range: 137--140
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Milewski, A V - Esterhuysen, E
    Type: Article
    In: Journal of South African botany
    Volume: 43
    Issue: 4
    Date: 1977
    Page Range: 233--241
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa