Delgado, M. N., A. A. Azevedo, L. C. Silva, G. E. Valente, and M. C. M. Kasuya. 2011. “COMPARATIVE ANATOMY OF CALOLISIANTHUS SPECIES (GENTIANACEAE – HELIEAE) FROM BRAZIL: TAXONOMIC ASPECTS”. Edinburgh Journal of Botany 68 (1): 139-55. https://doi.org/10.1017/S0960428610000284.