Florística dos componentes arbóreo e arbustivo de um trecho da Floresta Estacional Semidecídua Montana, município de Pedreira, estado de S?o Paulo

摘要

The aims of this study were to know the species of trees and shrubs in a fragment of Semideciduous Montane Forest and investigate the floristic difference between Montane and Submontane forests in S?o Paulo State. To survey tree and shrub species, weekly collectings were done during 15 months in the Fazenda Bela Vista (46o52' W and 22o47' S, 750-850 m). A total of 151 species of 106 genera and 47 angiosperm families was collected. Leguminosae, Myrtaceae, Lauraceae, Rubiaceae, Meliaceae, Piperaceae, Solanaceae, Ocotea, Piper, Machaerium, Miconia, Eugenia and Solanum were the richest taxa. Samples performed by other authors of the Montane and Submontane formations of the Seasonal Semideciduous Forest were compared. Leguminosae, Euphorbiaceae, Myrtaceae, Rubiaceae, Lauraceae, Machaerium, Eugenia, Solanum and Croton had higher relative constancy and richness of tree and shrub species in both formations. The G test indicated that Solanaceae, Asteraceae, Melastomataceae, Aspidosperma, Trichilia and Casearia had significantly higher species richness and relative constancy in the Montane formation. On the other hand, Meliaceae, Rutaceae, Moraceae, Ocotea, Miconia, Myrcia and Ficus had significantly higher richness and constancy in the Submontane formation. Therefore, each formation has distinct floristic composition at the species as well as at genera and family levels.