Florentín, J.E., Nuñez Florentin, M. & Barea Pastore, J.F. (2019)

Four highland species of Galianthe (Rubiaceae: Spermacoceae) with restricted distribution in South America: conservation assessment and complete descriptions

. Phytotaxa 402 (6): 265–280. https://doi.org/10.11646/phytotaxa.402.6.1