Resumo

DEMATTEIS, Massimiliano. Revisión taxonómica del género sudamericano Chrysolaena (Vernonieae, Asteraceae). Bol. Soc. Argent. Bot. [online]. 2009, vol.44, n.1-2, pp.103-170. ISSN 1851-2372.

A revision of the South American genus Chrysolaena (Vernonieae, Asteraceae.The genus Chrysolaena H. Rob. (Vernonieae, Asteraceae) can be distinguished from the remaining South American members of the tribe by its sericeous to velvety indumentum, anthers with glandular apical appendages, styles lacking a basal nodule and glandular cypselas. It can also be separated from other American genera of the tribe by the pollen morphology and the chromosome number. The last constitutes one of the most important features, because Chrysolaena is the single American member of the tribe with basic number x=10, a number widespread in Old World Vernonieae. At the present, this genus comprises 12 species mainly distributed in southern Brazil, Paraguay and northeastern Argentina. In this paper, all the species recognized until now are described and illustrated and six entities are added to the group, two of which are new taxa. The possible phylogenetic relationships of the genus are also discussed and the geographic distribution of most species is revised to include a larger area.

Palavras-chave : Vernonia; Chromosomes; Pollen morphology; Compositae.

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