A recent survey of the species of Indigofera L. occuring in the Rio Grande do Sul State, Brazil, revealed four species in the area: Indigofera sabulicola Benth., I. asperifolia Bong., I. suffruticosa Mill, and I. campestris Bong. It is given a short historical review on the systematic position of the genus. Identification key to the species studied, descriptions, illustrations, and data such as distribution, habitat, flowering and frutification are also- presented.
Indigofera; Legurninosae; Papilionoideae; Systematics