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  1. By: Williams, Ion
    Type: Article
    In: Journal of South African botany
    Volume: 39
    Issue: 2
    Date: 1973
    Page Range: 179--183
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Williams, Ion
    Type: Article
    In: Journal of South African botany
    Volume: 39
    Issue: 3
    Date: 1973
    Page Range: 229--232
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  3. By: Williams, Ion
    Type: Article
    In: Journal of South African botany
    Volume: 40
    Issue: 2
    Date: 1974
    Page Range: 85--89
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  4. By: Williams, Ion
    Type: Article
    In: Journal of South African botany
    Volume: 40
    Issue: 4
    Date: 1974
    Page Range: 275--290
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  5. By: Goldblatt, Peter, - Williams, Ion
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 74
    Date: 1987
    Page Range: 443--444
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-