Manual de plantas de Costa Rica. - Crow, Garrett E.; Faden, Robert B.; Goldblatt, Peter; Gómez-Laurito, Jorge; Grant, Jason R.; Grayum, Michael H.,; Hammel, Barry E.,; Hensold, Nancy; Kennedy, Helen; Kree, W. John; Maas, Paul J.M.; Maas-van de Kamer, Hiltje; et al. (Missouri Botanical Garden Press, 2004)