LUTEYN, J. L., & PEDRAZA-PEÑALOSA, P. (2013). Nomenclature, taxonomy, and conservation of the neotropical genus Sphyrospermum (Ericaceae: Vaccinieae), including five new species for Colombia, Ecuador, and Peru. Phytotaxa, 79(1), 1–29. https://doi.org/10.11646/phytotaxa.79.1.1