Abstract
Calea is a shrubby genus of Compositae (Heliantheae), which contains approximately one hundred species. The genus commonly occurs throughout the Neotropics in open, disturbed montane regions. A treatment has never been provided for the Colombian species of the genus. As a result of this study, seventeen species are recognized from over forty names of Calea attributed to Colombia. In addition, a key to species, descriptions, photographs, geographic distribution maps, and discussion of related species are provided. Also, floral illustrations are given for 13 species. New chromosome counts are given for six taxa of Calea, three of which occur in Colombia. Polyploidy in Calea (sensu stricto) and observations on leaf anatomy in Calea are reported for the first time.
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