Variation in breeding systems between species of the same taxonomic group complicates consistent application concepts, and perhaps even logically circumscription species. Several genera arid-zone ephemerals Angianthus clade (Asteraceae: Gnaphalieae: Gnaphaliinae) contain both outcrossing non-outcrossing The latter are recognised by producing an order magnitude fewer pollen grains per anther oft...

Abstract The aim of this study was to estimate reproductive effort and success in tropical trees examine the effect pollen limitation on success. Pollen assessed through supplementation experiment contrast open pollination treatment. taxa selected were Bombax ceiba, Erythrina stricta (ornithophilous trees), Lagerstroemia speciosa, Mesua ferrea Schima wallichii (entomophilous trees). Index highe...

We studied some ecological parameters such as richness, abundance, density, biomass and variation in species composition in four vegetation zones and in a zone with anthropic disturbance in the Massambaba Restinga in Arraial do Cabo, Rio de Janeiro State. We sampled 100 plots of 100 m(2) (10 x 10 m) recording the bromeliad species and their abundance. We found a total of seven bromeliad species...