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  1. By: Cowan, Richard S., - Gunn, Charles R. - Lackey, James Andrew - Kirkbride, Joseph H., Jr. - Wiersema, John Harry - Polhill, Roger Marcus - Mackinder, Barbara Ann - Rico-Arce, Maria de Lourdes,
    Publication info: Kew, Royal Botanic Gardens, Kew, 1999-2014
    Holding Institution: Royal Botanic Gardens Kew, Library, Art & Archives
  1. By: Robson, Diana Bizecki - Wiersema, John Harry - Hellquist, C Barre - Borsch, Thomas
    Type: Article
    In: The Canadian field-naturalist
    Volume: 130
    Issue: 1
    Date: 2016-01-01
    Page Range: 25--31
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Wiersema, John Harry
    Type: Article
    In: SIDA, contributions to botany
    Volume: 9
    Date: 1982
    Page Range: 230--234
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  3. By: Wiersema, John Harry
    Type: Article
    In: SIDA, contributions to botany
    Volume: 10
    Date: 1984
    Page Range: 195--198
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  4. By: Wiersema, John Harry - Hellquist, C B
    Type: Article
    In: Rhodora
    Volume: 96
    Date: 1994
    Page Range: 170--178
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  5. By: Ritter, Nur - Wiersema, John Harry - Crow, Garrett E.
    Type: Article
    In: Rhodora
    Volume: 103
    Date: 2001
    Page Range: 326--331
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  6. By: Borsch, Thomas - Loehne, Cornelia - Mbaye, Mame - Wiersema, John Harry
    Type: Article
    In: Telopea: Journal of plant systematics
    Volume: 13
    Issue: 1-2
    Date: 2011-02-16
    Page Range: 193--217
    Publication Info: Sydney Royal Botanic Garden Sydney 2012-
  7. By: Novelo Retana, Alejandro. - Wiersema, John Harry
    Type: Article
    In: Acta Botánica Mexicana
    Volume: 51
    Date: 2000
    Page Range: 53--60
    Publication Info: México, Instituto de Ecología, A C, 1988-