MORALES, J. F. “Studies in the Neotropical Apocynaceae XLI: A New Species of <em>Prestonia</Em> (Apocynoideae, Echiteae) from Peru and a Key to the Peruvian Species”. Phytotaxa, vol. 29, no. 1, Sept. 2011, pp. 28–32, doi:10.11646/phytotaxa.29.1.2.