| Cycas siamensis | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Cycadophyta |
| Class: | Cycadopsida |
| Order: | Cycadales |
| Family: | Cycadaceae |
| Genus: | Cycas |
| Species: | C. siamensis |
| Binomial name | |
| Cycas siamensis Miq. | |
Cycas siamensis is a species of cycad native to Myanmar, Thailand, and Vietnam.
Cycads are seed plants that typically have a stout and woody (ligneous) trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters to several meters tall. They typically grow very slowly and live very long. Because of their superficial resemblance, they are sometimes mistaken for palms or ferns, but they are not closely related to either group.
Cycas is a genus of cycad, and the only genus in the family Cycadaceae. About 113 species are accepted, which are native to the Indo-Pacific, East Africa and Madagascar. Cycas circinalis, a species endemic to India, was the first cycad species to be described in western literature, and is the type species of the genus. The best-known Cycas species is Cycas revoluta.
Cycas revoluta is a species of gymnosperm in the family Cycadaceae, native to southern Japan including the Ryukyu Islands. It is one of several species used for the production of sago, as well as an ornamental plant. The sago cycad can be distinguished by a thick coat of fibers on its trunk. The sago cycad is sometimes mistakenly thought to be a palm, although the only similarity between the two is that they look similar and both produce seeds.
Cycas armstrongii is a species of cycad in the genus Cycas, endemic to Northern Territory of Australia. It is found from the Finniss River in the west to the Arnhem Highway in the east, north of Pine Creek. It also occurs on the Tiwi Islands and the Cobourg Peninsula
Cycas arnhemica is a species of cycad in the genus Cycas, native to Australia, in the northwest of Northern Territory in Arnhem Land, after which it is named.
Cycas beddomei is a species of cycad in the genus Cycas, native to India, where it is confined to a small area of Andhra Pradesh state in the Tirumala Hills in scrubland and brush covered hills.
Cycas bifida is a species of cycad plant in the genus Cycas, native to southern China, and northern Vietnam.
Cycas circinalis, also known as the queen sago, is a species of cycad known in the wild only from southern India. Cycas circinalis is the only gymnosperm species found among native Sri Lankan flora.
Cycas pectinata was the fourth species of Cycas to be named; it was described in 1826 by Scottish surgeon and botanist Francis Buchanan-Hamilton from Kamrup, Assam in northeast India. The species is one of the most widespread cycads. It is found in the northeastern part of India, Nepal, Bhutan, northern Burma, southern China (Yunnan), Bangladesh, Burma, Malaysia, Cambodia, northern Thailand, Laos, and Vietnam. Cycas pectinata usually grow at elevation 300 m to 1200 m and in difficult terrains. In China, it grows in dry, open thickets in limestone mountains, red soil in sparse monsoon forests. Cycas pectinata grows up to 40 feet (12 m) tall and has very large, ovoid male cones. The tallest Cycas pectinata is a female plant in North Kamrup, Assam which measures 52.8 feet (16.1 m). The tree is the world's tallest Cycas plant. In Northeast India, the species is under severe threat due to clearing of forest and overcollection of male cones for preparation of traditional medicines. The species is listed in CITES Appendix II and IUCN Redlist.
Cycas rumphii, commonly known as queen sago or the queen sago palm, is a dioecious gymnosperm, a species of cycad in the genus Cycas native to Indonesia, New Guinea and Christmas Island. Although palm-like in appearance, it is not a palm.
Cycas panzhihuaensis is a rare and vulnerable species of cycad known in the wild only from Sichuan and Yunnan provinces in China. It can be seen at the South China Botanical Garden in Guangzhou and is also cultivated for horticulture, where it is often known as the Dukou sago palm.
Cycas changjiangensis is a plant species in the cycad order, Cycadales. It is endemic to Hainan Island of southern China. It grows at elevations of 600–800 metres (2,000–2,600 ft). It is found only in a small area in Bawangling 霸王岭国家森林公园, Changjiang County, western Hainan Province, China.
Cycas inermis is a vascular plant belonging to the family Cycadaceae, endemic to central and southern Vietnam. Its name in Vietnamese is Thiên tuế or Tuế lá quyết.
Cycas chevalieri is a species of cycad in central Vietnam, including in Nghe An Province. It may also occur in Laos.
Cycas diannanensis is a species of cycad endemic to Yunnan, China.
Cycas elephantipes is a species of cycad. It is found only on a few high sandstone mesas in Nong Bua Rawe District, Chaiyaphum Province, northeastern Thailand. It is morphologically similar to Cycas pachypoda from southern Vietnam.
Cycas seemannii is a species of cycad found in Fiji, Vanuatu, Tonga, and New Caledonia.
Cycas orientis is a species of cycad, native to Australia's Northern Territory.
Cycas wadei is a species of cycad endemic to Culion island, Philippines. There is only one subpopulation of about 5,000 mature individuals, located in a small area to the east of Halsey Harbor.
