|Scientific Name:||Mammillaria guelzowiana Werderm.|
|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 valid species by Anderson (2001), Hunt (1999) and Pilbeam (1999).|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor(s):||Fitz Maurice, W.A. & Fitz Maurice, B|
|Reviewer(s):||Superina, M. & Goettsch, B.K.|
Mammillaria guelzowiana is undergoing recovery. It could qualify for listing due to its recent 95% reduction in population size, apparently a result of the 1997 freeze on Mexico’s altiplano. Alfred Lau (pers. comm. 2002) advises of an additional population north of Mina de Navidad but this site has not been evaluated by the assessors after the freeze and is thus not included here. Given that the species is under-way to recovery and there are no more major threats, it is listed here as Least Concern.
|Previously published Red List assessments:|
|Range Description:||This species is found west of Nazas in Durango, Mexico. It grows at an altitude of about 1,400 m asl.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species was common. It had an estimated population size of more than 10,000 plants in 1994. A subsequent visit in 2000 revealed a population reduced by more than 95% to less than 500, apparently largely a result of the 1997 freeze on Mexico’s altiplano. There is no recent information on its population status.|
|Current Population Trend:||Increasing|
|Habitat and Ecology:||This cactus grows on volcanic rocky outcroppings in semi-desert.|
|Use and Trade:||This species is likely collected.|
|Major Threat(s):||The major threats for this species are temperature extremes, and probably illegal collecting.|
This species is listed on CITES Appendix II, but enforcement of the laws in the countries of destination is required. New plants are currently being propagated from seed sown in situ. This propagation should also counteract the impacts of the illegal collections. It is easily grown from seed in cultivation.
This species is legally protected in Mexico by the national list of species at risk of extinction, NOM-059-SEMARNAT-2010, where it is listed under category “threatened” (A; SEMARNAT 2010).
|Amended reason:||The species distribution map has been added.|
|Citation:||Fitz Maurice, W.A. & Fitz Maurice, B. 2017. Mammillaria guelzowiana (amended version of 2013 assessment). The IUCN Red List of Threatened Species 2017: e.T40836A121499961.Downloaded on 23 February 2018.|
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