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  1. By: Souza, Elnatan Bezerra de - Ferreira de Sales, Margareth
    Type: Article
    In: Acta Botanica Brasilica
    Date: 2004-12-01
    Subjects: Brasil  Rubiaceae  Spermacoceae  Staelia  Taxonomía  
  2. By: Salas, Roberto M. - Cabral, Elsa Leonor
    Type: Article
    In: Darwiniana
    Date: 2006-12-01
    Subjects: Bolivia  Brasil  Rubiaceae  Spermacoceae  Staelia  Taxonomía