A study of the genetic variability of a population of Hypericum brasiliense was made using several isozyme systems as well as an investigation of the morphogenic potential of apical buds from plants at different development stages (juvenile and adult) using in vitro culture. The results from nine isozymes systems showed low polymorphism in the alleles. Apical buds from juvenile plants originated plantlets with apical dominance and fast growth while those from adults led to the development of flower buds.474629632