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- Cycas abstract "Cycas is the type genus and the only genus recognised in the family Cycadaceae. About 113 species are accepted [1] . Cycas circinalis, a species endemic to India was the first cycad species to be described and was the type of the generic name, Cycas. The best-known Cycas species is Cycas revoluta. The Cycas is a very ancient genus of trees. The group achieved its maximum diversity in the Jurassic and Cretaceous periods, when it was distributed almost worldwide. At the end of the Cretaceous, when the non-avian dinosaurs became extinct, so did most of the cycas in the Northern Hemisphere. The genus is native to the Old World, with the species concentrated around the equatorial regions - eastern and southeastern Asia including the Philippines with 10 species (9 of which are endemic), eastern Africa (including Madagascar), northern Australia, Polynesia, and Micronesia. Australia has 26 species, while the Indo-Chinese area has about 30. India has 9 species. The northernmost species (C. revoluta) is found at 31°N in southern Japan. The southernmost (C. megacarpa) is found at 26°S in southeast Queensland. Due to the occurrence of large number of Cycas species in China and Australia, both the countries are considered as two centres of diversity of Cycas.The plants are dioecious, and the family Cycadaceae is unique among the cycads in not forming seed cones on female plants, but rather a group of leaf-like structures called megasporophylls each with seeds on the lower margins, and pollen cones or strobilus on male individuals.The caudex is cylindrical, surrounded by the persistent petiole base. Most species form distinct branched or unbranched trunks but in some species the main trunk can be subterranean with the leaf crown appearing to arise directly from the ground. There are two types of leaves - foliage leaves and scaly leaves. The foliage leaves are pinnate (or more rarely bipinnate) and arranged spirally, with thick and hard keratinose. They are not permanent and fall off leaving back leaf-bases. The leaflets are articulated, have midrib but lack secondary veins. The scaly leaves are persistent, brown in colour and protective in function. Megasporophylls are not gathered in cones. Pollination takes place by air.Often considered a living fossil, the earliest fossils of the genus Cycas appear in the Cenozoic although Cycas-like fossils that may belong to Cycadaceae extend well into the Mesozoic. Cycas is not closely related to other genera of cycads, and phylogenetic studies have shown that Cycadaceae is the sister-group to all other extant cycads.The plant takes several years to grow, sexual reproduction takes place after 10 years of exclusive vegetative growth which occurs by bulbils arising at the base of the trunk.Cycas species are threatened worldwide and almost all the species are listed in IUCN Redlist. Cycas beddomei is the only species of the genus Cycas listed in Appendix I of CITES. Cycas rumphii and Cycas pectinata have the most widespread distribution.".
- Cycas class Cycad.
- Cycas kingdom Plant.
- Cycas order Cycad.
- Cycas synonym "*Dyerocycas (Nakai)".
- Cycas synonym "*Epicycas (de Laub.)".
- Cycas synonym "*Todda-pana (Adans.)".
- Cycas thumbnail Cycus_tici.jpg?width=300.
- Cycas wikiPageExternalLink index.php.
- Cycas wikiPageExternalLink 78.
- Cycas wikiPageExternalLink index.html.
- Cycas wikiPageExternalLink webmedia.php?irn=46748&reftable=ebibliography.
- Cycas wikiPageExternalLink www.cycadsofindia.in.
- Cycas wikiPageExternalLink vce_index.htm.
- Cycas wikiPageID "1528473".
- Cycas wikiPageLength "13619".
- Cycas wikiPageOutDegree "132".
- Cycas wikiPageRevisionID "703317530".
- Cycas wikiPageWikiLink Carl_Linnaeus.
- Cycas wikiPageWikiLink Category:Cycads.
- Cycas wikiPageWikiLink Category:Cycas.
- Cycas wikiPageWikiLink Caudex.
- Cycas wikiPageWikiLink Cenozoic.
- Cycas wikiPageWikiLink Christiaan_Hendrik_Persoon.
- Cycas wikiPageWikiLink Conifer_cone.
- Cycas wikiPageWikiLink Cycad.
- Cycas wikiPageWikiLink Cycas_aculeata.
- Cycas wikiPageWikiLink Cycas_angulata.
- Cycas wikiPageWikiLink Cycas_annaikalensis.
- Cycas wikiPageWikiLink Cycas_apoa.
- Cycas wikiPageWikiLink Cycas_arenicola.
- Cycas wikiPageWikiLink Cycas_armstrongii.
- Cycas wikiPageWikiLink Cycas_arnhemica.
- Cycas wikiPageWikiLink Cycas_badensis.
- Cycas wikiPageWikiLink Cycas_balansae.
- Cycas wikiPageWikiLink Cycas_basaltica.
- Cycas wikiPageWikiLink Cycas_beddomei.
- Cycas wikiPageWikiLink Cycas_bifida.
- Cycas wikiPageWikiLink Cycas_bougainvilleana.
- Cycas wikiPageWikiLink Cycas_brachycantha.
- Cycas wikiPageWikiLink Cycas_brunnea.
- Cycas wikiPageWikiLink Cycas_cairnsiana.
- Cycas wikiPageWikiLink Cycas_calcicola.
- Cycas wikiPageWikiLink Cycas_campestris.
- Cycas wikiPageWikiLink Cycas_canalis.
- Cycas wikiPageWikiLink Cycas_candida.
- Cycas wikiPageWikiLink Cycas_chamaoensis.
- Cycas wikiPageWikiLink Cycas_changjiangensis.
- Cycas wikiPageWikiLink Cycas_chevalieri.
- Cycas wikiPageWikiLink Cycas_circinalis.
- Cycas wikiPageWikiLink Cycas_clivicola.
- Cycas wikiPageWikiLink Cycas_collina.
- Cycas wikiPageWikiLink Cycas_condaoensis.
- Cycas wikiPageWikiLink Cycas_conferta.
- Cycas wikiPageWikiLink Cycas_couttsiana.
- Cycas wikiPageWikiLink Cycas_curranii.
- Cycas wikiPageWikiLink Cycas_debaoensis.
- Cycas wikiPageWikiLink Cycas_desolata.
- Cycas wikiPageWikiLink Cycas_diannanensis.
- Cycas wikiPageWikiLink Cycas_dolichophylla.
- Cycas wikiPageWikiLink Cycas_edentata.
- Cycas wikiPageWikiLink Cycas_elephantipes.
- Cycas wikiPageWikiLink Cycas_elongata.
- Cycas wikiPageWikiLink Cycas_fairylakea.
- Cycas wikiPageWikiLink Cycas_falcata.
- Cycas wikiPageWikiLink Cycas_ferruginea.
- Cycas wikiPageWikiLink Cycas_fugax.
- Cycas wikiPageWikiLink Cycas_furfuracea.
- Cycas wikiPageWikiLink Cycas_guizhouensis.
- Cycas wikiPageWikiLink Cycas_hainanensis.
- Cycas wikiPageWikiLink Cycas_hoabinhensis.
- Cycas wikiPageWikiLink Cycas_hongheensis.
- Cycas wikiPageWikiLink Cycas_inermis.
- Cycas wikiPageWikiLink Cycas_javana.
- Cycas wikiPageWikiLink Cycas_lanepoolei.
- Cycas wikiPageWikiLink Cycas_lindstromii.
- Cycas wikiPageWikiLink Cycas_litoralis.
- Cycas wikiPageWikiLink Cycas_maconochiei.
- Cycas wikiPageWikiLink Cycas_macrocarpa.
- Cycas wikiPageWikiLink Cycas_media.
- Cycas wikiPageWikiLink Cycas_megacarpa.
- Cycas wikiPageWikiLink Cycas_micholitzii.
- Cycas wikiPageWikiLink Cycas_micronesica.
- Cycas wikiPageWikiLink Cycas_multipinnata.
- Cycas wikiPageWikiLink Cycas_nathorstii.
- Cycas wikiPageWikiLink Cycas_nayagarhensis.
- Cycas wikiPageWikiLink Cycas_nongnoochiae.
- Cycas wikiPageWikiLink Cycas_ophiolitica.
- Cycas wikiPageWikiLink Cycas_orientis.
- Cycas wikiPageWikiLink Cycas_orixensis.
- Cycas wikiPageWikiLink Cycas_pachypoda.
- Cycas wikiPageWikiLink Cycas_panzhihuaensis.
- Cycas wikiPageWikiLink Cycas_papuana.
- Cycas wikiPageWikiLink Cycas_pectinata.
- Cycas wikiPageWikiLink Cycas_petraea.
- Cycas wikiPageWikiLink Cycas_platyphylla.
- Cycas wikiPageWikiLink Cycas_pranburiensis.
- Cycas wikiPageWikiLink Cycas_pruinosa.
- Cycas wikiPageWikiLink Cycas_revoluta.
- Cycas wikiPageWikiLink Cycas_riuminiana.