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Bravo, H. 1978. Las cactáceas de México. Vol. I. Universidad Nacional Autónoma de México, México, D.F. Britton, N.L. and Rose, J.N. 1919. The Cactaceae. Vol I. Carnegie Institution of Washington, Washington, D.C. Hernández, H.M., Gómez-Hinostrosa, C. and Bárcenas, R.T. 2001. Studies on Mexican Cactaceae. II. Opuntia megarrhiza, a poorly known endemic from San Luis Potosí, Mexico. Brittonia 53(4): 28-533. Hunt, D. 1999. CITES Cactaceae Checklist, 2nd ed. Royal Botanic Gardens, Kew and International Organization for Succulent Plant Study (IOS). IUCN. 2002. 2002 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 8 October 2002. |
| Citation: | Hernández, H.M., Gómez-Hinostrosa, C. & Goettsch, B. 2002. Opuntia chaffeyi. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 21 May 2013. |
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