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. Reproduction 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. Conservation status 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 List of species Cycas aculeata Cycas aenigma Cycas angulata Cycas annaikalensis Cycas apoa Cycas arenicola Cycas armstrongii Cycas arnhemica Cycas badensis Cycas balansae Cycas basaltica Cycas beddomei Cycas bifida Cycas bougainvilleana Cycas brachycantha Cycas brunnea Cycas cairnsiana Cycas calcicola Cycas campestris Cycas canalis Cycas candida Cycas cantafolia Cycas chamaoensis Cycas changjiangensis Cycas chenii Cycas chevalieri Cycas circinalis Cycas clivicola Cycas collina Cycas condaoensis Cycas conferta Cycas couttsiana Cycas cupida Cycas curranii Cycas debaoensis Cycas desolata Cycas diannanensis Cycas distans P.I.Forst. & B.Gray Cycas dolichophylla Cycas edentata Cycas elephantipes Cycas elongata Cycas falcata Cycas fairylakea Cycas ferruginea Cycas fugax Cycas furfuracea Cycas glauca Cycas guizhouensis Cycas hainanensis Cycas hoabinhensis Cycas hongheensis Cycas indica (=Cycas swamyi) Cycas inermis Cycas javana Cycas lacrimans Cycas lane-poolei Cycas lindstromii Cycas litoralis Cycas maconochiei Cycas macrocarpa Cycas media Cycas megacarpa Cycas micholitzii Cycas micronesica Cycas montana Cycas multipinnata Cycas nathorstii Cycas nayagarhensis Cycas nitida Cycas nongnoochiae Cycas ophiolitica Cycas orientis Cycas orixensis Cycas pachypoda Cycas panzhihuaensis Cycas papuana Cycas pectinata Cycas petraea Cycas platyphylla Cycas pranburiensis Cycas pruinosa Cycas revoluta (Sago palm) Cycas riuminiana Cycas rumphii Miq. Cycas sancti-lasallei Cycas sainathii Cycas saxatilis Cycas schumanniana Cycas scratchleyana Cycas seemannii A.Braun Cycas segmentifida Cycas semota Cycas sexseminifera Cycas shanyaensis Cycas siamensis Cycas silvestris Cycas simplicipinna Cycas sphaerica Cycas sundaica Cycas szechuanensis Cycas taitungensis Cycas taiwaniana Cycas tanqingii Cycas tansachana Cycas thouarsii Cycas tropophylla Cycas tuckeri Cycas vespertilio Cycas wadei Cycas xipholepis Cycas yorkiana Cycas yunnanensis Cycas zambalensis Cycas zeylanica References External links Hill, K.D.(1998–2004) The Cycad Pages, Royal Botanic Gardens Sydney. http://plantnet.rbgsyd.nsw.gov.au/PlantNet/cycad/index.html Virtual Cycad Encyclopedia edited by the Palm & Cycad Societies of Florida David, J. de Laubenfels, Cycas Taxonomy Singh, R & JS Khuraijam (2013-)