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  1. By: Adamson, R S - Sprague, T A
    Type: Article
    In: Journal of South African botany
    Volume: 7
    Date: 1941
    Page Range: 89--91
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Sprague, T A
    Type: Article
    In: Annals of botany
    Volume: 17
    Date: 1903-01
    Page Range: 159--166
    Publication Info: London, Academic Press [etc.],
  3. By: Sprague, T A
    Type: Article
    In: Rhodora
    Volume: 30
    Date: 1928
    Page Range: 53--59
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]