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  1. By: Dewet, J M J - Harlan., J R
    Type: Article
    In: Journal of South African botany
    Volume: 37
    Issue: 1
    Date: 1971
    Page Range: 53--56
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Wet, J. M. J. de. - Harlan., J R - Gray, J. R.
    Type: Article
    In: Phytologia
    Volume: 33
    Date: 1976
    Page Range: 203--227.
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke