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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Tölken, H R
    Type: Article
    In: Journal of South African botany
    Volume: 38
    Issue: 2
    Date: 1972
    Page Range: 67--80
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Tölken, H R
    Type: Article
    In: Journal of South African botany
    Volume: 39
    Issue: 3
    Date: 1973
    Page Range: 233--234
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa