Abstract

RAMIREZ-AMEZCUA, Yocupitzia  and  WERNER STEINMANN, Victor. Taxonomic revision of Argythamnia subgenus Ditaxis (Euphorbiaceae) in Mexico. Bot. sci [online]. 2013, vol.91, n.4, pp.427-459. ISSN 2007-4476.

A taxonomic revision of the Mexican species of Argythamnia subgen. Ditaxis (Euphorbiaceae) is provided. This subgenus is a little-studied neotropical assemblage of approximately 50 species, considered by some authors to be a genus. Fourteen species and one additional variety occur in Mexico, and seven species and one variety are endemic. Two species, Argythamnia ingramii and A. silviae are proposed as new to science and A. simulans is reported for the first time from the country. In addition, A. micrandra, A. neomexicana, and Ditaxis discolor, three species that have been recently recognized as distinct are here reduced to synonymy, and a lectotype for A. humilis is designated. A key to the taxa, bibliographic information, morphological descriptions, list of specimens examined, ecological data, taxonomic comments, and distribution maps are given.

Keywords : diversity; Malpighiales; new species.

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