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Diversity of arbuscular mycorrhizal fungi (AMF) was investigated from natural (MF) and cultivated sites (TF) of Flemingia vestita Benth. ex Baker. Samplings were done at monthly intervals for one crop cycle. Root samples were evaluated for AMF colonization. Trap cultures were also established with four different host plants (Oryza sativa L., Paspalum notatum Flüggé, Trifolium repens L. and Zea mays L.) using rhizosphere soils from natural and cultivated sites of F. vestita as the source of AMF inoculum. A total of 61 AMF species (51 from natural site and 46 from cultivated site) belonging to six genera (Acaulospora, Ambispora, Gigaspora, Glomus, Pacispora and Scutellospora) could be distinguished from F. vestita rhizosphere soil. 33 AMF species belonging to five genera (Acaulospora, Gigaspora, Glomus, Paraglomus and Scutellospora) were isolated from trap cultures (25 AMF species from trap plants with MF derived inoculum and 18 AMF species from trap plants with TF derived inoculum). Three additional AMF species were isolated in trap cultures that were not detected in field soils, indicating that trap culture allows development and sporulation of AMF species which otherwise were not recovered from field soil. Higher AMF diversity was observed in natural site than in cultivated site of F. vestita.