The genus Brachiaria includes about 100 species which occur in the tropical and subtropical regions of both hemispheres. Germplasm of Brachiaria was collected since the 1950s, but the first comprehensive collecting mission for this genus was carried out only in the mid -1980s in eastern Africa, leading to the acquisition of a very large and diverse collection. Brachiaria pastures rely essentially on a few widespread genotypes of seven species. In the attach, the Table 2 show Brachiaria cultivars derived from accessions maintained in the germplasm bank held at CIAT, evaluated by the International Network for the Evaluation of Tropical Pastures (RIEPT). Five accessions of four species (B. brizantha, B. decumbens, B. dictyoneura, B. humidicola) have been the source of 20 cultivars released in different tropical American countries.