''Cycas changjiangensis'' is a plant species in the cycad order,

Cycad Cycads are seed plants that typically have a stout and woody (ligneous) trunk (botany), trunk with a crown (botany), crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants o ...

ales. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Hainan Hainan (, ; ) is the smallest and southernmost province of the People's Republic of China (PRC), consisting of various islands in the South China Sea. , the largest and most populous island in China,The island of Taiwan, which is slightly l ...

Island of southern

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

. It grows at elevations of .Flora of China v 4 p 6 ''Cycas changjiangensis''
/ref> It is found only in a small area in Bawangling 霸王岭国家森林公园,

Changjiang County Changjiang Li Autonomous County (formerly known by its Cantonese romanization name Cheongkong) is an autonomous county in Hainan, China. It is one of six counties of Hainan. Its postal code is 572700, and in 1999 its population was 225,131 people, ...

, western

Province, China. ''Cycas changjiangensis'' has a trunk up to long but much of this is often subterranean. Leaves are

pinnate Pinnation (also called pennation) is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as some forms of ice or metal crystals, and in ...

, up to long, with spines along the

rachis In biology, a rachis (from the grc, ῥάχις [], "backbone, spine") is a main axis or "shaft". In zoology and microbiology In vertebrates, ''rachis'' can refer to the series of articulated vertebrae, which encase the spinal cord. In this c ...

. Leaflets are in 40–70 pairs, with prominent midveins on both surfaces. The green to yellow-brown seeds are less than wide.Liu, Nian. 2004. Proceedings of the Sixth International Conference on Cycad Biology: Cycad 2002, Nong Nooch Tropical Botanical Garden, 29 July-3 August, Chonburi, Thailand p 3, ''Cycas hainanensis'' subsp. ''changjiangensis'' This is an

endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...

with perhaps 2000 individuals remaining in the wild.Chen, J-R 2010
''Cycas changjiangensis''.
The IUCN Red List of Threatened Species. Version 2015.2. Downloaded on 04 September 2015.

References

{{Taxonbar, from=Q10262602 changjiangensis Endemic flora of China Flora of Hainan Plants described in 1839