- ↑ Checklist of CITES Species Part 1 CITES species index, 2011
- ↑ Hunt, David, 2006 The New Cactus Lexicon: Text
- ↑ Tropicos, botanical information system at the Missouri Botanical Garden, available at http://www.tropicos.org/, 2013
- ↑ Alexander, Edward F., 2001 The Cactus Family
- ↑ USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. URL: http://www.ars-grin.gov/cgi-bin/npgs/html/paper.pl?language=en Ginhipos 2013-02-27 han Wayback Machine, 2013
- ↑ 6.0 6.1 Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed) (2014). "Species 2000 & ITIS [[Catalogue of Life]]: 2014 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 26 Mayo 2014. CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- ↑ (Canada);http://siit.conabio.gob.mx (Mexico) ITIS Global: The Integrated Taxonomic Information System