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  1. By: Clark, John L. (John Littner)
    Type: Article
    In: PhytoKeys
    Volume: 253
    Date: 2025
    Page Range: 1--9
    Publication Info: Sofia, Bulgaria Pensoft Publishers [2010]-
    Subjects: Chocó  Colombia  Columnea  Ecuador  Gesneriaceae  taxonomy
  2. By: Clark, John L. (John Littner) - Tobar Suárez, Diego Francisco - Clavijo, Laura - Perret, Mathieu - Graham, Catherine
    Type: Article
    In: PhytoKeys
    Volume: 182
    Date: 2021
    Page Range: 67--82
    Publication Info: Sofia, Bulgaria Pensoft Publishers [2010]-
    Subjects: Colombia  Columnea  Ecuador  Gesneriaceae  taxonomy
  3. By: Tobar Suárez, Diego Francisco - Smith, James - Clark, John L. (John Littner)
    Type: Article
    In: PhytoKeys
    Volume: 196
    Date: 2022
    Page Range: 49--61
    Publication Info: Sofia, Bulgaria Pensoft Publishers [2010]-
    Subjects: Chocó  Colombia  Columnea  Ecuador  Gesneriaceae  taxonomy