Acta Botanica Brasilica
versão impressa ISSN 0102-3306
FLORES, Andréia Silva e RODRIGUES, Rodrigo Schütz. Leguminosae diversity in a savanna area of Roraima, Brazil. Acta Bot. Bras. [online]. 2010, vol.24, n.1, pp.175-183. ISSN 0102-3306. http://dx.doi.org/10.1590/S0102-33062010000100017.
Leguminosae is the most diverse family in the savannas of Roraima, which are the largest savanna areas in the Brazilian Amazon. This paper presents a floristic survey and an analysis of the geographic distribution patterns of Leguminosae taxa in a savanna area at Boa Vista, Roraima (02º52´07´´N; 60º43´03´´W). The survey identified 80 taxa belonging to 38 genera. Six taxa are new records for the flora of Roraima. The best-represented genera were Aeschynomene and Chamaecrista, both with seven species each. Leguminosae-Papilionoideae was the most diverse subfamily based on the number of genera (24) and infrageneric taxa (53). The phytogeographical analysis revealed predominance of taxa with a Neotropical distribution. The savanna site analyzed represents a legume diverse area, because it concentrates 87% of legume diversity referred for the savannas of Roraima.
Palavras-chave : floristic survey; Guayana; Leguminosae; phytogeography.