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  1. By: Grobbelaar, N - Clarke, Brenda
    Type: Article
    In: Journal of South African botany
    Volume: 38
    Issue: 4
    Date: 1972
    Page Range: 241--247
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Grobbelaar, N - Clarke, Brenda
    Type: Article
    In: Journal of South African botany
    Volume: 41
    Issue: 1
    Date: 1975
    Page Range: 29--36
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa