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A review of research on the cycad genus Ceratozamia Brongn. (Zamiaceae) in Mexico

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The genus Ceratozamia contains more than 20 species distributed in eastern and southern Mexico, with extensions into Central America. Morphology, anatomy, and molecular (ITS) data allow resolution of some aspects of species relationships, provide correlations with ecology, and suggest phytogeographic hypotheses. Some species complexes, such as those centered around C. norstogii and C. miqueliana, are restricted to southernwest Mexico, in what are regarded as Pleistocene floristic refugia. The low level of divergence of ITS sequences among taxa to the north of the Trans-Mexican Neovolcanic mountain range suggests a pattern of recent, and perhaps rapid, speciation.
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Document Type: Research Article

Affiliations: 1: Departamento de Sistemática Vegetal, Instituto de Ecología, A. C., Apdo Postal 63, Xalapa, Veracruz, 91000Mexico. 2: Escuela de Biología, Universidad de Ciencias y Artes del Estado de Chiapas, Calz. Samuel León Brindis 151,Tuxtla Gutierrez, Chiapas, 29000 Mexico.

Publication date: 01 May 2004

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