|Scientific Name:||Mammillaria schwarzii|
|Taxonomic Notes:||Accepted as a valid species by Anderson (2001), Hunt (1999) and Pilbeam (1999).|
|Red List Category & Criteria:||Critically Endangered A2ad+3d+4ad; B1ab(v)+2ab(v) ver 3.1|
|Assessor/s:||Fitz Maurice, W.A. & Fitz Maurice, B.|
|Reviewer/s:||Stuppy, W. & Taylor, N.P. (Cacti & Succulent Plant Red List Authority)|
Qualifies due to its small population in a single area, where it continues to decline as a result of illegal collecting. Since this species was rediscovered in 1987 (Fitz Maurice 1988), the population has diminished by an estimated 90% (Fitz Maurice 1994a, b).
|Range Description:||Grows near San Felipe on a steep volcanic rock face about 100 m (plan view) by 4 km long. Current estimated population size is less than 1,000 individuals.|
|Range Map:||Click here to open the map viewer and explore range.|
|Habitat and Ecology:||Grows on steep volcanic rock in semi-desert at about 2,300 m altitude.|
|Major Threat(s):||very threatened by illegal collecting. The locality is a standard stop for cactus tour groups from Europe and is now well known to both commercial and amateur collectors.|
|Conservation Actions:||Listed on CITES App. II, but enforcement of the law in countries of destination is needed. This species has been widely propagated worldwide for 40 years.|
Anderson, E.F. 2001. The Cactus Family. Timber Press, Portland.
Fitz Maurice, W.A. 1988. Fieldnotes: The rediscovery of Mammillari schwarzii. Cactus and Succulent Journal (US) 60(2): ?
Fitz Maurice, W.A. and B. 1994a. Mammillaria schwarzii revisited. Cactus and Succulent Journal (US) 66(3): ?
Fitz Maurice, W.A. and B. 1994b. Der Fall Mammillaria schwarzii. Schumannia 1: 36-38.
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.
Pilbeam, J. 1999. Mammillaria. Cirio Publishing Services, Southampton.
Shurly, E. 1949. Mammillaria schwarzii. Cactus and Succulent Journal of Great Britain 11: 17.
|Citation:||Fitz Maurice, W.A. & Fitz Maurice, B. 2002. Mammillaria schwarzii. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 20 June 2013.|
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