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Variation in the Mexican Cycad Dioon edule (Zamiaceae)
Loran M. Whitelock
Vol. 70, No. 2 (Apr. - Jun., 2004), pp. 240-249
Stable URL: http://www.jstor.org/stable/4354476
Page Count: 10
You can always find the topics here!Topics: Leaves, Plants, Stems, Altitude, Habitats, Female animals, Biological taxonomies, Population dynamics, Habitat conservation
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The Mexican cycad Dioon edule with its two varieties, edule and angustifolium, range from the states of Tamaulipas and Nuevo León in the north to the state of Veracruz in the south. The variety angustifolium is restricted to the northern portions of the range, while the variety edule is from the southernmost distribution in central Veracruz. Between the two varieties of Dioon edule there are a number of disjunct colonies that exhibit variations that are undoubtedly the result of an extended period of genetic isolation. These colonies display variation in the maximum size of their stems, morphology and color of leaves and leaflets, distinctions in both male and female cones, color of the sarcotesta, and size and shape of the sclerotesta. These differences are maintained even when specimens are grown in cultivation under identical conditions. Critical investigations of these colonies may ultimately disclose the need for additional species descriptions.
Botanical Review © 2004 New York Botanical Garden Press