Cycas tansachana

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA CYCADOPSIDA CYCADALES CYCADACEAE

Scientific Name: Cycas tansachana
Species Authority: K.D.Hill & S.L.Yang

Assessment Information [top]

Red List Category & Criteria: Critically Endangered   A2cd;B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)   ver 3.1
Year Assessed: 2010
Assessor/s: Hill, K.D.
Reviewer/s: Donaldson, J.S. & Bösenberg, J.D.
Justification:
This species has an extremely small area of occupancy and extent of occurrence (less than 10 km²), is known only from a single location and has declined dramatically due to mining of limestone for the making of cement. At one stage it was thought to be Extinct in the Wild after limestone outcrops were destroyed, but was subsequently found on adjacent outcrops.
History:
2003 – Critically Endangered (IUCN 2003)

Geographic Range [top]

Range Description: This species is endemic to south central Thailand, occurring to the north east of Khong Khi Sua in Sariburi Province. Occurs at an elevation of 400 m.
Countries:
Native:
Thailand

Population [top]

Population: Plants are locally abundant (2,500 to 10,000 mature individuals) but very restricted in their distribution.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species grows on limestone outcrops growing in full sun or partial shade in crevices on bare rock. The limestone outcrops are covered with sparse, seasonally deciduous forest.
Systems: Terrestrial

Threats [top]

Major Threat(s): This species is apparently quite restricted in occurrence and under severe pressure from plant collectors and limestone mining operations.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of the CITES Appendices.
Citation: Hill, K.D. 2010. Cycas tansachana. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 04 February 2012.
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