Viguiera Kunth (Asteraceae, Heliantheae) on South America and systematic of species from Brasil / Viguiera Kunth (Asteraceae, Heliantheae) na América do Sul e sistemática das espécies do Brasil.

AUTOR(ES)

Mara Angelina Galvão Magenta

DATA DE PUBLICAÇÃO

2006

RESUMO

This study presents a taxonomic review of the species Viguiera Kunth that occur in Brazil, and includes descriptions, illustrations, distribution maps and comments. Identification keys are also provided for related groups and to the South American species. The leaf anatomy study supplied new subsidies for the delimitation of the species or of species groups. The pollinic analysis either presents useful partial information in taxonomy. An investigation was elaborated on Viguiera sensu lato, through three analyses, involving different numbers of terminal taxa and using morphological data; the first one tried to explain the real taxonomic position of its representative members and the last two sought for a better delimitation of the groups of species in the Continent. The analysis of the patterns of geographic distribution made possible the delimitation of two groups with different morphological characteristics, and a intermediate one; the first group is exclusive from Andean region, the second not happens in the Andes, and the third do not occur in the Andes, with a few intrusions in other localities. The results also corroborate others authors hypothesis, that the origin of the genus is recent in Brazil. In relation of the edaphic conditions, there are two groups of species in Brazil: the first one is found in regions with climate of the type Cwa and the second in the climate of the type Aw, of the Köpen classification; only 4 species happen in climate Cfa, but they are not exclusively Brazilian. There was no support for the transfer of the South American species to the genus Rhysolepis.

ASSUNTO(S)

palinologia asteraceae filogenia heliantheae asteraceae palynology phylogeny south america viguiera viguiera taxonomia biogeography taxonomy américa do sul heliantheae

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