Cover Illustration: The three most abundant Venezuelan columnar cacti, from left to right, Pilosocereus lanuginosus (Linnaeus) Byles & Rowley, Stenocereus griseus (Haworth) Buxbaum, and Cereus repandus (Linnaeus) Miller. These species depend strictly on nectar-feeding bats for their pollination. Bat-mediated gene dispersal confers high levels of genetic exchange among populations of the three species, a process that enhances levels of genetic diversity within their populations. See Nassar et al.: Population genetic structure of Venezuelan chiropterophilous columnar cacti (Cactaceae), in the upcoming (November) issue of the American Journal of Botany (volume 90, number 11). Photo credit: Janet Castro.
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Copyright © 2003 by the Botanical Society of America, Inc.
