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Dioon holmgrenii

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA CYCADOPSIDA CYCADALES ZAMIACEAE

Scientific Name: Dioon holmgrenii
Species Authority: De Luca, Sabato & Vázq.Torres
Common Name(s):
Spanish Palma Del Sol (Sun Palm)

Assessment Information [top]

Red List Category & Criteria: Endangered A4c; B1ab(iii,iv)+2ab(iii,iv) ver 3.1
Year Published: 2010
Date Assessed: 2009-10-31
Assessor(s): Chemnick, J., Gregory, T. & Morales S.
Reviewer(s): Donaldson, J.S. & Bösenberg, J.D.
Justification:
Classified as Endangered based on an estimated ongoing decline of >50% over three generations. Also qualifies under criterion B due to very small extent of occurrence, small number of locations and ongoing decline.
History:
2003 Endangered (IUCN 2003)
2003 Endangered
1997 Vulnerable (Walter and Gillett 1998)

Geographic Range [top]

Range Description: This species is restricted to state of Oaxaca, Mexico. Plants occurs to the south west of San Gabriel Mixtepec.
Countries:
Native:
Mexico (Oaxaca)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Plants are known only from two (500 and 10,000 plants) colonies.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species grows mainly in humid forest dominated by species of Pinus and Quercus. They are found on slopes with a north eastern exposure. Plants often grow in ravines in humus-rich soil.
Systems: Terrestrial

Threats [top]

Major Threat(s): These plants are affected by habitat destruction due to agriculture (corn, pastures) and also as a result of over-collecting.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of the CITES Appendices. Plants are protected by local communities.

Bibliography [top]

Chemnick, J., Gregory, T. and Morales, S. 2007. Email received in response to request for information.

Donaldson, J.S. (ed.). 2003. Cycads. Status Survey and Conservation Action Plan. IUCN/SSC Cycad Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.

Hill, K.D. and Stevenson, D.W. 1998-2006. The Cycad Pages. Available at: http://plantnet.rbgsyd.gov.au/PlantNet/cycad/.

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).

Jones, D.L. 1993. Cycads of the World. Reed, New Holland, Frenchs Forest, N.S.W., Australia.

Whitelock, L.M. 2002. The Cycads. Timber Press, Portland, Oregon.


Citation: Chemnick, J., Gregory, T. & Morales S. 2010. Dioon holmgrenii. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 25 July 2014.
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