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Two New Species of Zamia (Zamiaceae, Cycadales) from Southern Mexico
Bart Schutzman, Andrew P. Vovides and Bijan Dehgan
Vol. 149, No. 3 (Sep., 1988), pp. 347-360
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/2995269
Page Count: 14
You can always find the topics here!Topics: Plants, Chromosomes, Species, Biological taxonomies, Metaphase, Leaves, Evolution, Ploidies, Diploidy, New species
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Two new species of the genus Zamia (Zamiaceae, Cycadales) from southern Mexico are described. Zamia soconuscensis, an arborescent species from the state of Chiapas, seems most closely related to Z. inermis. Zamia cremnophila, a cliff-dwelling, pendent-leaved species from Tabasco, appears to belong to a species group including Z. purpurea and Z. splendens. We have endeavored to utilize an Adansonian approach to species delimitation in Zamia by employing as many characteristics as possible. Our concept of species is compared to the extremes of fine splitting and extreme lumping of taxa used in the past. Both new species exhibit relatively symmetrical karyotypes with a diploid chromosome number of 16; Z. cremnophila has a symmetry index of 1.65, and that of Z. soconuscensis is 2.08. The species of Zamia thus far studied appear to support the hypothesis that asymmetrical, high-numbered karyotypes, concomitant with reduced vegetative and reproductive structures, are common in inhospitable environments, but discrepancies exist.
Botanical Gazette © 1988 The University of Chicago Press