Abstract
The complex structure of the abiotic factors in the Lesser Antilles leads tosingular vegetation ranging from the dry to the humid. Geomorphology bymeans of the wide variety of topographic facets is the determining parameterwhich leads to gradients of mesological factors. Among the latter, both on thewindward and leeward facades, the precipitation is distinguished by biocli-matic staging associated with plant stagings which consist of a mosaic ofphytocenoses of variable sizes, ages, floristic compositions and structures aswell as of different architecture. Based on examples of old and recent floristicsurveys by authors which indicate ecotones, types and inversions of vegeta-tion, we have shown the great phytocenotic diversity of the plant cover in theLesser Antilles which are all biosystemic responses to the effects of naturaland anthropogenic hazards. Thanks to this significant ecosystemic plasticity,the Lesser Antilles represent veritable laboratories for autoecological andsynecological studies as well as of floristic succession