|Scientific Name:||Mammillaria berkiana|
|Taxonomic Notes:||Taxonomic Reliability: Considered synonymous with M. mercadensis by cactus specialist Anderson (2001) and by the assessors. It is accepted as a species by cactus specialists Hunt (1999), provisionally, and Pilbeam (1999). The assessors have demonstrated that M. berkiana has no known characteristics that differentiate it from the surrounding M. jaliscana/M. mercadensis apart from the intensity of the flower color.|
|Red List Category & Criteria:||Critically Endangered A2a; B1ab(v); C2a(ii) 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 two known areas of occupancy, considered here to be a single location, where it was decimated by the Dec. 1997 freeze on Mexico’s Altiplano. At the time of the assessors’ first visit to the type locality with Lau in 1994, the population was estimated to be in excess of 5,000 plants. In 1999 the population was estimated to be less than 100 plants. This species is regarded by some to be synonymous with M. jaliscana and/or M. mercadensis.
|Range Description:||Occurs north of San Andreas from two sites about 3 km apart, probably best considered a single location. The estimated total range is 25 km². It is estimated that the total area of occupancy of the two subpopulations is less than 1 km², and with a total population estimated to be less than 100 individuals.|
|Range Map:||Click here to open the map viewer and explore range.|
|Habitat and Ecology:||Sloping volcanic rocky terrain in semi-desert at about 1,600 m altitude.|
|Major Threat(s):||Currently little threatened by collectors. Although the habitat is known to collectors, the trip to the type locality from and back to the nearest rudimentary facilities takes a full day thus discouraging tour groups and casual collectors. Natural disasters seem to be the main cause for concern.|
|Conservation Actions:||Listed on CITES App. II, but need to enforce the laws in the countries of destination.|
Anderson, E.F. 2001. The Cactus Family. Timber Press, Portland.
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.
Lau, A. 1986. Mammillaria berkiana. Kakteen & Sukkulenten 37: 2.
Pilbeam, J. 1999. Mammillaria. Cirio Publishing Services, Southampton.
|Citation:||Fitz Maurice, W.A. & Fitz Maurice, B. 2002. Mammillaria berkiana. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 26 May 2013.|
|Feedback:||If you see any errors or have any questions or suggestions on what is shown on this page, please fill in the feedback form so that we can correct or extend the information provided|