|Scientific Name:||Mammillaria guillauminiana Backeb.|
|Taxonomic Source(s):||Hunt, D., Taylor, N. and Charles, G. (compilers and editors). 2006. The New Cactus Lexicon. dh Books, Milborne Port, UK.|
|Taxonomic Notes:||Accepted as a species by Anderson (2001) and Pilbeam (1999). Lüthy (1995) and the Assessors consider it to have been a synonym of M. jaliscana (Britton & Rose) Boed. / M. mercadensis Patoni. The description of this plant does not differentiate it from M. jaliscana / M. mercadensis Patoni, found in the Durango area and widely elsewhere. Hunt et al. (2006) indicate that its status is uncertain and that it is perhaps just a form of M. jaliscana.|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Assessor(s):||Fitz Maurice, B & Fitz Maurice, W.A.|
The taxonomy of this species is uncertain and in need of clarification, as their is no consensus on whether it is a good species or part of the M. mercadensis complex. The species as treated here, M. guillaumaniana, is not Extinct in the Wild, as experts Betty and W.A. Fitz-Maurice rediscovered the species in 2003, after it was last assessed in 2002. However, the localities(s) have not been visited since then and there is no information on the species' population size or on any threats affecting it. Until the species' taxonomy is resolved and reliable information on its distribution, population and threats are available, it is listed as Data Deficient.
|Previously published Red List assessments:|
|Range Description:||This species is reported from the Mexican states of Durango and Sinaloa, occurring between 1,300 to 1,800 m (Pilbeam 1999).|
Native:Mexico (Durango, Sinaloa)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||There is no information available on the population size or trend of this species.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||The species grows in humus between rocks and in shady places (Pilbeam 1999), probably in desert scrub.|
|Use and Trade:||The species is sought after by specialized collectors, as it is regarded as a rare species, as it is not easily found in trade. However, specimens are probably grown from seed (Pilbeam 1999).|
|Major Threat(s):||The threats to this species are unknown.|
|Conservation Actions:||This species is not protected. Research is needed on its taxonomy.|
|Amended reason:||The species distribution map has been added.|
IUCN. 2013. IUCN Red List of Threatened Species (ver. 2013.1). Available at: http://www.iucnredlist.org. (Accessed: 12 June 2013).
IUCN. 2017. The IUCN Red List of Threatened Species. Version 2017-3. Available at: www.iucnredlist.org. (Accessed: 7 December 2017).
Pilbeam, J. 1999. Mammillaria. Cirio Publishing Services, Southampton.
|Citation:||Fitz Maurice, B & Fitz Maurice, W.A. 2017. Mammillaria guillauminiana (amended version of 2013 assessment). The IUCN Red List of Threatened Species 2017: e.T40837A121500102.Downloaded on 23 May 2018.|
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