|Scientific Name:||Opuntia chaffeyi|
|Species Authority:||Britton & Rose|
|Taxonomic Notes:||Recognized by Britton & Rose (1919), Bravo (1978), Hunt (1999), Hernández et al. (2001) and Hunt et al. (2006) as a good species.|
|Red List Category & Criteria:||Critically Endangered D ver 3.1|
|Assessor(s):||Hernández, H.M., Gómez-Hinostrosa, C. & Goettsch, B.K.|
|Reviewer(s):||Chanson, J.S. & Goettsch, B.K.|
The known distribution of the species is extremely narrow (extent of occurrence is ca 63 km² and the area of occupancy is ca 12 km²), and it is known from three separate localities which are not severely fragmented. The estimated number of individuals is critically low, only about 15 mature individuals in total. The habitat is expected to decline in the future mostly due to cattle and agricultural development.
|Range Description:||This species is restricted to a small area (ca. 63 km²) in the state of Zacatecas, Mexico. Only three separate localities are known.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The species occurs in very low population densities, with no more than five plants at each of the localities, hence the population is potentially not greater than 15 mature individuals.|
|Habitat and Ecology:||Grows in the silty flood plain of a dried lake with scarce desert vegetation, mostly Prosopis and Larrea.|
|Use and Trade:||The rhizomes of this species are used for medicinal purposes as an anti-inflammatory to treat broken bones.|
|Major Threat(s):||Habitat destruction mostly by cattle is a major threat. The species is also harvested for medicinal purposes. The area could potentially be impacted by agricultural expansion if bore holes are sunk to get water for irrigation.|
|Conservation Actions:||The establishment of protected areas is needed, as this species grows together with other threatened species. Listed on CITES Appendix II.|
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).
Hunt, D., Taylor, N. and Charles, G. (compilers and editors). 2006. The New Cactus Lexicon. dh Books, Milborne Port, UK.
IUCN. 2013. IUCN Red List of Threatened Species (ver. 2013.1). Available at: http://www.iucnredlist.org. (Accessed: 12 June 2013).
|Citation:||Hernández, H.M., Gómez-Hinostrosa, C. & Goettsch, B.K. 2013. Opuntia chaffeyi. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 21 August 2014.|
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