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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.
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, which prohibits international trade in specimens of these species except when the purpose of the import is not commercial, for instance for scientific research.
Most species inhabit mountainous areas at 800–1000 m elevation, on sheltered slopes in moist forests. These forests range from tropical rainforests that are always wet, to pine-oak forests with alternating wet and dry seasons. There is a noticeable correlation between characteristics of species and the wetness or dryness of the habitat. Species with broad, thin leaflets live in wet habitats, and species with narrow, thick leaflets live in climates with wet and dry seasons.
Ceratozamia alvarezii · Cycad · Ceratozamia brevifrons · Ceratozamia chimalapensis · Ceratozamia decumbens · Cycad · Ceratozamia fuscoviridis · Cycad · Ceratozamia hondurensis · Ceratozamia huastecorum · Cycad · Cycad
Text excerpted from the Wikipedia article Ceratozamia by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
