This species is similar to C. paulina, but differs by its floral morphology. A key separating it is included. In addition, synonyms with lectotypes here designed and an actualized distribution map in South America from both species are provided.
Bach, H. G., & Fortunato, R. H. (2014). Crotalaria Vespertilio (Papilionoideae, Leguminosae) nuevo registro para el nordeste de Argentina y este de Paraguay. Boletín de la Sociedad Argentina de Botánica,49, (3),p.393-400
Bach, Hernán G., Fortunato, Renée H.. 2014. "Crotalaria Vespertilio (Papilionoideae, Leguminosae) nuevo registro para el nordeste de Argentina y este de Paraguay". Boletín de la Sociedad Argentina de Botánica 49, no.3:393-400.
Recuperado de http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2014bach