Estudos taxonomicos em Matayba Aubl. sect. Matayba (Sapindaceae) / Taxonomic studies in Matayba Aubl. sect. Matayba (Sapindaceae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Sapindaceae presents about 140 genera and approximately 1600 species in Brazil is represented by 24 genera and about 400 species. Matayba Aubl. counts with 56 species being bushes or trees, distributed from Mexico to the north of Argentina and in Brazil 26 species are referred for several plant formations including the savannahs, campos rupestres, sandbank forests and the Atlantic forest. Matayba sect. Matayba is the largest section of the genus in number of species (18) and it is presented just in South America. In Brazil the section is distributed predominantly out of the Amazonia, except M. guianensis with wide distribution and M. artropurpurea that occurs in the Amazonian Brazilian and Colombian, but that appears with an uncertain positioning in this work. The objective of this work is to delimit morfologically the species of Matayba sect. Matayba through descriptions, a identification key and illustrations, besides presents taxonomic comments and geographical distribution about the species. The work was accomplished through bibliographical survey, consults to the herbaria (39 in Brazil and one in Argentina - CTES) and collection from expeditions. The main characters used to separate the species of this section are the number and form of the leflets, the prominence and venation types and the position of the domatia. In the flowers they stand out this diagnoses characters are the size of the appendix in realation with the petals and the presence of hairs in of floral parts like the sepals, petals and threads. The results obtained in this work counts with 16 species, being two of them new for the Science, besides a new synonymy for M. elaeagnoides and three species that were treated as uncertain positioning. Minas Gerais has the largest number of species of this section (7 spp.) distributed mainly in the savannahs and campos rupestres, being two of them endemic (M. mollis and M. punctata). Among the species with largerest geographical distribution make stand out M. elaeagnoides that occurs from Minas Gerais to Rio Grande do Sul, and M. guianensis in the whole South America with the exception in Argentina.

ASSUNTO(S)

vegetal taxonomy matayba sapindaceae taxonomia vegetal

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