Ritz, C.M.; Reiker, J.; Charles, G.; Hoxey, P.; Hunt, D.; Lowry, M.; Stuppy, W.; Taylor, N. (2012). "Molecular phylogeny and character evolution in terete-stemmed Andean opuntias (Cactaceae−Opuntioideae)". Molecular Phylogenetics and Evolution. 65 (2): 668–681. doi:10.1016/j.ympev.2012.07.027. PMID22877645.
Griffith, M. Patrick; Porter, J. Mark (2009-01-01). "Phylogeny of Opuntioideae (Cactaceae)". International Journal of Plant Sciences. 170 (1): 107–116. doi:10.1086/593048. ISSN1058-5893.
Hernandez-Hernandez, T.; Hernandez, H. M.; De-Nova, J. A.; Puente, R.; Eguiarte, L. E.; Magallon, S. (2010-12-23). "Phylogenetic relationships and evolution of growth form in Cactaceae (Caryophyllales, Eudicotyledoneae)". American Journal of Botany. 98 (1): 44–61. doi:10.3732/ajb.1000129. ISSN0002-9122. PMID21613084.
nih.gov
pubmed.ncbi.nlm.nih.gov
Ritz, C.M.; Reiker, J.; Charles, G.; Hoxey, P.; Hunt, D.; Lowry, M.; Stuppy, W.; Taylor, N. (2012). "Molecular phylogeny and character evolution in terete-stemmed Andean opuntias (Cactaceae−Opuntioideae)". Molecular Phylogenetics and Evolution. 65 (2): 668–681. doi:10.1016/j.ympev.2012.07.027. PMID22877645.
Hernandez-Hernandez, T.; Hernandez, H. M.; De-Nova, J. A.; Puente, R.; Eguiarte, L. E.; Magallon, S. (2010-12-23). "Phylogenetic relationships and evolution of growth form in Cactaceae (Caryophyllales, Eudicotyledoneae)". American Journal of Botany. 98 (1): 44–61. doi:10.3732/ajb.1000129. ISSN0002-9122. PMID21613084.
Griffith, M. Patrick; Porter, J. Mark (2009-01-01). "Phylogeny of Opuntioideae (Cactaceae)". International Journal of Plant Sciences. 170 (1): 107–116. doi:10.1086/593048. ISSN1058-5893.
Hernandez-Hernandez, T.; Hernandez, H. M.; De-Nova, J. A.; Puente, R.; Eguiarte, L. E.; Magallon, S. (2010-12-23). "Phylogenetic relationships and evolution of growth form in Cactaceae (Caryophyllales, Eudicotyledoneae)". American Journal of Botany. 98 (1): 44–61. doi:10.3732/ajb.1000129. ISSN0002-9122. PMID21613084.