Abstract
The Ronnbergia Alliance is a recently described lineage composed of two highly supported and identifiable clades with strong geographic correlation: the Pacific and the Atlantic clades. These clades, however, are composed by species currently placed in the polyphyletic genera Aechmea, Hohenbergia, and Ronnbergia. This study aims to reorganize the species that comprise both the Pacific and Atlantic clades into stable and predictable taxonomic categories. In this context, the 26 species that compose the Pacific clade are here circumscribed in the genus Ronnbergia, whereas the 44 species grouped in the Atlantic clade are assigned to the resurrected genus Wittmackia. An updated circumscription of these two genera is presented, including a taxonomic key to recognize the species. Additionally, the respective taxonomic transferences and general information to the species are presented in the form of a synopsis. This taxonomic treatment will facilitate future approaches on the study of the systematics, conservation, and evolution of the Ronnbergia Alliance.
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