Cycas armstrongii 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Cycadopsida Cycadales Cycadaceae

Scientific Name: Cycas armstrongii Miq.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A4ace ver 3.1
Year Published: 2010
Date Assessed: 2009-10-31
Assessor(s): Liddle, D.
Reviewer(s): Donaldson, J.S. & Bösenberg, J.D.
Originally regarded as Least Concern due to large numbers extending over a wide range. However, this species has declined due to urban expansion around Darwin and is expected to decline by at least 30% over three generations due to altered fire regimes caused by invasive grasses.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to the Northern Territory, Australia. It extends from the Adelaide River west to the Finniss River and south to the township of Adelaide River, with sporadic occurrences farther south almost to Hayes Creek and Emerald Springs, and in a limited area on Melville Island.
Countries occurrence:
Australia (Northern Territory)
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species occurs in large populations comprising more than 100,000 plants in total.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:100000
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:C. armstrongii is an abundant species, in dense and extensive populations on sand over tertiary laterites in Eucalyptus miniata/E. tetrodonta forests around Darwin. Plants are found under open tropical deciduous woodlands, rarely in rocky situations.
Generation Length (years):40

Threats [top]

Major Threat(s): Land clearing and inappropriate fire regimes are the main threats. Increased fire intensity, particularly arising from increased fuel load due to invasion of exotic grasses, is expected to result in higher mortality. It is estimated that the rate of clearing and loss due to fires will result in a loss of at least 30% over three generations.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of the CITES Appendices. C. armstrongii is found in multiple land tenures including private, government and leasehold. It is found in the following parks and reserves: Berry Springs Nature Park, Black Jungle Conservation Area, Blackmore River Conservation Reserve, Casuarina Coastal Reserve, Djukbinj National Park, Garig Gunak Barlu National Park, Holmes Jungle Nature Park, Howard Springs Hunting Reserve, Howard Springs Nature Park, Kakadu National Park, Litchfield National Park and Manton Dam Recreation Area.

Citation: Liddle, D. 2010. Cycas armstrongii. The IUCN Red List of Threatened Species 2010: e.T41987A10594710. . Downloaded on 19 October 2017.
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