ABSTRACT
Twelve species were recognized in the present revision: M. floridum, M. goudoti, M. gracile, M. hatschbachii, M. myrianthum, M. nyctitans, M. obovatum, M. ovalifolium, M. ruddianum, M. saraense, M. scleroxylon and M. tortipes. M. nyctitans had its circumscription modified and infraspecific taxa were not recognized for this species. A new name, M. ruddianum, was proposed to replace M. floridum var. parviflorum. New synonyms were recognized for M. myrianthum and M. nyctitans and an epitype was designated for this last species. The species of this section show disjunct distribution, with some species occuring mainly in Southeastern Brazil and others in countries from the Amazon basin and Central America.
Key words:
Taxonomy; Leguminosae; Papilionoideae; Dalbergieae; Machaerium