|Scientific Name:||Mammillaria crinita|
Mammillaria crinita DC. forma tezontle
|Taxonomic Notes:||Three subspecies are recognized, the nominate form, subsp. leucantha and subsp. wildii. Subspecies leucantha and wildii were previously assessed in 2002 as Data Deficient, but as they have not been reassessed they are now excluded. Subspecies schenvariana, also previously assessed in 2002 as Extinct in the Wild has been excluded as it is not accepted as a good taxon.|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor(s):||Fitz Maurice, B & Fitz Maurice, W.A.|
|Reviewer(s):||Superina, M. & Goettsch, B.K.|
Mammillaria crinita is listed as Least Concern due to its large population, extensive subpopulations, and widespread nature with little evidence of decline from human activities. The distinctive form of M. crinita tezontle is highly threatened and requires site level conservation of its very limited range.
This species is endemic to Mexico, where it occurs in the states of Aguascalientes, Guanajuato, Hidalgo, Jalisco, Michoacán, Querétaro, San Luis Potosí, and Zacatecas at elevations of 1,400 to 2,500 m asl.
Native:Mexico (Aguascalientes, Guanajuato, Hidalgo, Jalisco, Michoacán, Querétaro, San Luis Potosí, Zacatecas)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is common, with an estimated population size of over 1 million individuals. Some subpopulations of unique forms are much smaller. The freeze of 1997 significantly reduced the population by an estimated 75%, but it is recovering.|
|Habitat and Ecology:||The species grows on volcanic rocks and soil in xerophyllous scrub, open oak (Quercus), and low desert scrub.|
|Use and Trade:||This species is collected as an ornamental plant for nativity scenes. Some forms are in commercial cultivation for international trade.|
The severity of threats varies with the forms and locations. Certain subpopulations and forms are highly threatened by illegal collection and a quarry in the case of Mammillaria crinita tezontle. Development for agriculture and urbanization impacts some subpopulations, but does not represent a major threat to the overall population. Temperature extremes such as the 100-year freeze on the Altiplano in December 1997 present a serious but unpredictable threat.
This species is legally protected in Mexico, where it is listed as “subject to special protection” on the national list of species at risk of extinction, NOM-059-SEMARNAT-2001 (Pr; SEMARNAT 2010). Certain forms and subpopulations require site level conservation, such as M. c. tezontle.
|Citation:||Fitz Maurice, B & Fitz Maurice, W.A. 2013. Mammillaria crinita. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 28 July 2014.|
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