Identificação e distribuição da família Asteraceae na Ilha Grande, Rio de Janeiro, RJ, Brasil.

Abstract

The vegetation of Ilha Grande is part of the Atlantic forest biome, which has a high rainfall index and extends over wide climatic regions and tropical and subtropical plant formations. In Brazil, it spreads on a narrow strip along all of the atlantic coast and moves inland as far as Argentina and Paraguay. Asteraceae is the third major Family in Atlantic forest species. Hence, one has tried to know the representativeness of that family in Ilha Grande, aiming at contributing to the preservation and maintenance of their ecosystems. In this context, one has made a bibliographic survey, consultations to herbariums and periodic field trips for data colllection. The collected material has been taken to the herbarium of Rio de Janeiro State University (UERJ) (HRJ). 67 species subordinated to 37 genera have been registered in the area, The genera are denominated as follows: Achyrocline (3 spp.), Adenostemma (1sp.), Ageratum (1 sp.), Austrocritonia (1 sp.), Astroeupatorium (1 sp.), Baccharis (8 spp.), Bidens (1 sp.), Blainvillea (1 sp.), Centratherum (1 sp.), Chaptalia (1 sp.), Chromolaena (3 spp.), Conyza (1 sp.), Cosmos (1 sp.), Eclipta (1 sp.), Elephantopus (2 spp.), Emilia (1 sp.), Erechtites (1 sp.), Galinsoga (1 sp.), Gamochaeta (1 sp.), Grazielia (1 sp.), Heterocondylus (2 spp.), Mikania (13 spp.), Piptocarpha (2 spp.), Pluchea (1 sp.), Praxelis (1 sp.), Pseudogynoxys (1 sp.), Pterocaulon (1 sp.), Sphagneticola (1 sp.), Sonchus asper (1 sp.), Steymarkina (1 sp.) Struchium (1 sp.), Synedrella (1 sp.), Tilesia (1 sp.), Tithonia (1 sp.), Trixis (1 sp.), Verbesina (1 sp.) e Vernonia (5 spp.). These genera are located in nine tribes. The following species are cited to Rio de Janeiro State for the first time: Mikania campanulata e Struchium sparganophorum.