Dioon holmgrenii

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

View Printer Friendly

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

Assessor/s:

Chemnick, J., Gregory, T. & Morales S.

Reviewer/s:

Donaldson, J.S. & Bösenberg, J.D.

Contributor/s:

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.

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.

Conservation Actions:

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

Citation:	Chemnick, J., Gregory, T. & Morales S. 2010. Dioon holmgrenii. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 24 May 2013.
Disclaimer:	To make use of this information, please check the <Terms of Use>.
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