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A review of research on the cycad genus Ceratozamia Brongn. (Zamiaceae) in Mexico
Author(s) -
Vovides Andrew P.,
González Dolores,
Pérez–Farrera Miguel Angel,
Avendaño Sergio,
Bárcenas Cristina
Publication year - 2004
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/4135609
Subject(s) - cycad , floristics , genus , pleistocene , taxon , ecology , range (aeronautics) , geography , biology , divergence (linguistics) , paleontology , evolutionary biology , linguistics , philosophy , materials science , composite material
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.