[Biological evaluation of Cuban plants. I].

Aqueous, alcoholic and ketonic extracts from five species of superior plants of the families Papilonaceae, Euforbiaceae, Moraceae, Piperaceae and Solanaceae were assessed from an antibacterial viewpoint using the gel double-layer diffusion method with cylindric sections. Values of inhibition areas are depicted in diameter millimeters. The best results were obtained from Desmodium barbatum extracts.