Ceratozamia is a genus of New World cycads in the family Zamiaceae. The genus contains 27 known currently living species and one or two fossil species. Most species are endemic to mountainous areas of Mexico, while few species extend into the mountains of Guatemala, Honduras and Belize. The genus name comes from the Greek ceras, meaning horn, which refers to the paired, spreading horny projections on the male and female sporophylls of all species.
Information related to Ceratozamia
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Many species have extremely limited ranges, and almost all described species are listed as vulnerable, endangered, or critically endangered by the IUCN Red List. The whole genus is listed under CITES Appendix I / EU Annex A, and CITES prohibits international trade in specimens of these species except when the purpose of the import is not commercial, for instance for scientific research. Illegal plant poaching has posed a major threat to Ceratozamia species.
This is the key to the Ceratozamia:
Leaflets are the widest above the middle of the frond.
Leaflets are the widest below the middle of the frond.
Leaflets are evenly spaced.
Leaflets are less than five centimeters wide.
Leaflets are more than five centimeters wide.
Leaflets are leathery; stiff and tough, but somewhat flexible.
Leaflets are not leathery.
Leaflets are less than nine centimeters wide, and thin or papery.
Leaflets are less than ten millimeters wide.
Leaflets are greater than one centimeter wide.
Rachis is not straight.
Leaflets are ten to fifteen millimeters wide.
Leaflets are two to five centimeters wide.
Petiole and rachis are green, bearing stiff prickles.
Leaflets are three centimeters wide or greater.
Rachis has stiff prickles or spines.
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- Whitelock, Loran. The Cycads. Portland: Timber Press, 2002.