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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

GIRALDO-CANAS, DIEGO. Phytogeographical relationships of Sierras and the rocky sandstone outcrops of the Colombian Guayana: a preliminary analysis. Rev. chil. hist. nat. [online]. 2001, vol.74, n.2, pp.353-364. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2001000200012.

Some phytogeographical relationships of the Colombian Guayana are commented. The analysis considered four groups of flowering plants: Axonopus (Poaceae: Panicoideae: Paniceae), Raddiella (Poaceae: Bambusoideae: Olyrodae), Rapateaceae and Malpighiaceae. The areas considered were the Sierras Chiribiquete, La Lindosa, La Macarena, and the rocky sandstone outcrops of El Tuparro, Araracuara, and Las Lajas of Guainía. Most species (70 %) are distributed in the Guayana Region; of these, about 16 % are endemic to the Colombian Guayana; while 30 % occur in the Neotropics. Results based on a phenetic biogeographical study support the hypothesis that the Sierra de La Macarena is an area belonging to the Colombian Guayana phytogeographical complex insted of to the Andean group. I propose that the Sierra de La Macarena belongs to Araracuara District of the Western Guayana Province

Keywords : Guayana shield; Colombian Guayana; Colombian Amazonia; phytogeography.

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