Mammillaria guelzowiana

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Bibliography

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
PLANTAE	TRACHEOPHYTA	MAGNOLIOPSIDA	CARYOPHYLLALES	CACTACEAE

Scientific Name:

Mammillaria guelzowiana

Species Authority:

Werderm.

Common Name/s:

Spanish

–

Biznaguita

Taxonomic Notes:

Accepted as a valid species by Anderson (2001), Hunt (1999) and Pilbeam (1999).

Assessment Information [top]

Red List Category & Criteria:	Critically Endangered A2a ver 3.1
Year Assessed:	2002
Assessor/s:	Fitz Maurice, W.A. & Fitz Maurice, B.
Reviewer/s:	Stuppy, W. & Taylor, N.P. (Cacti & Succulent Plant Red List Authority)
Justification: Qualifies 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.) advises of an additional population north of Mina de Navidad but we have not evaluated this site after the freeze and do not include it here.

Geographic Range [top]

Range Description:	This species is found west of Nazas in an area of about 6 km². 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.
Countries:	Native: Mexico (Durango)

Population [top]

Population Trend:	Increasing

Population Trend:

Increasing

Habitat and Ecology [top]

Habitat and Ecology:	On volcanic rocky outcroppings in semi-desert at about 1,400 m altitude.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	Illegal collecting and temperature extremes.

Major Threat(s):

Illegal collecting and temperature extremes.

Conservation Actions [top]

Conservation Actions:	Listed on CITES App. 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.

Conservation Actions:

Listed on CITES App. 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.

Bibliography [top]

	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. Pilbeam, J. 1999. Mammillaria. Cirio Publishing Services, Southampton. Werdmann, F. 1928. Mammillaria guelzowiana Werd N sp. Zeitschrift für Sukkulentenkunde 3: 356.

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.

Pilbeam, J. 1999. Mammillaria. Cirio Publishing Services, Southampton.

Werdmann, F. 1928. Mammillaria guelzowiana Werd N sp. Zeitschrift für Sukkulentenkunde 3: 356.

Citation:	Fitz Maurice, W.A. & Fitz Maurice, B. 2002. Mammillaria guelzowiana. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 10 February 2012.
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