Abstract
Three new species of Swartzia are described and illustrated. All three are endemic to the western-Andean region and Pacific lowlands of Colombia, an important secondary area of diversity for this Amazonian-centered genus. Swartzia amabale is a multifoliolate member of the predominantly Amazonian section Unifoliolatae. It is closely related to S. glabrata of the eastern Guiana Shield and is one of only two species of its section that occurs outside of Amazonia. Swartzia radiale belongs to the small section Pittierianae and is notable for its nearly actinomorphic androecium and relatively high-elevation habitat. Swartzia versicolor is one of three subtly distinct species of the distinctive section Digynae. Its discovery augments a pronounced pattern of geographical disjunction, the other two species of the section being distributed in and around the Guiana Shield and in the littoral zone of eastern Brazil, respectively. The conservation status of each of the three new species is of concern, as indicated by small geographical ranges, rarity, and the ongoing fragmentation of forests in western Colombia.
Resumen
Tres especies nuevas de Swartzia son descritas e ilustradas. Las tres son endémicas de la región andina occidental y de las tierras bajas de la zona Pacífica de Colombia, un área de importancia secundaria de la diversidad de este género, el cual tiene la mayor parte de su diversidad concentrada en la Amazonía. Swartzia amabale es un miembro multifoliolado de la sección Unifoliolatae que tiene distribución predominantemente amazónica. Es cercanamente relacionada a S. glabrata de la parte oriental del Escudo Guayanés y es una de sólo dos especies de la sección que están distribuidas fuera de la Amazonía. Swartzia radiale pertenece a la pequeña sección Pittierianae y es notable por su androceo casi actinomórfico y su hábitat en elevación relativamente alta. Swartzia versicolor es una de tres especies sutilmente distintas de la sección peculiar Digynae. Su descubrimiento aumenta un patrón pronunciado de disyunción geográfica; las otras dos especies de la sección ocurren en la vecindad del Escudo Guayanés y en la zona litoral del este de Brasil, respectivamente. El estado de conservación de cada una de las tres especies nuevas es preocupante, como lo sugieren las pequeñas áreas de distribución geográfica, la rareza y la fragmentación del bosque en el oeste de Colombia.
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Acknowledgments
We thank the curators of the herbaria cited for allowing us to access their specimens, Gwilym Lewis and Aleksandar Radosavljevic for their helpful reviews of the manuscript, Bobbi Angell for skillfully illustrating two of the new species, and the National Science Foundation for financial support (DEB-0918498).
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Torke, B.M., Bohórquez, L.K.R., Muños, D.J.T. et al. Miscellaneous additions to Swartzia (Fabaceae) from Chocoan and Andean Colombia. Brittonia 67, 298–310 (2015). https://doi.org/10.1007/s12228-015-9382-4
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DOI: https://doi.org/10.1007/s12228-015-9382-4