Summary
We investigated three ecological aspects of the vegetation of an Amazonian campina The subjects studied were chosen to complement the study of Anderson et alii (1975) and the thesis studies of students of INPA. The first part is an analysis of the small islands of vegetation which occur in the open campina. We found a total of 25 species of woody plants and we also studied some herbaceous species. Data is presented on the occurrence of species and the associations between them and their correlation with island size. The second part is a study of two species of Loranthaceae (Phthirusa rufa (Mart.) Eichl. and P. micrantha Eichl). These hemi-parasites occur in the open and shady areas of the campina and show a tendency to have specific nosts, especially Hirtella racemosa Lam. var racemosa (Chrysobalanaceae) in the case of P. micrantha, and Ouratea spruceana Engl. (Ochnaceae) in the case of P. rufa. Some anatomical and ecophysiological aspects of this host-parasite relationship are also discussed. The final part is an analysis of the occurrence of some selected species of epiphytes in five species of trees which are common in the campina. The study was made in both sun and shade campina, and also in campinarana.