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Cover Illustration: Fruit color polymorphisms are striking examples of intraspecific genetic variation in plants that can interact with animal associates such as seed dispersers. Diaspores of the Australian desert shrub Acacia ligulata (Fabaceae) are composed of a black seed (ca. 5 mm in length) surmounted by a colored, lipid-rich aril (ca. 2.5 mm). The three color morphs-red, orange, and yellow-are dispersed by both ants and birds. See Whitney: Linking frugivores to the dynamics of a fruit color polymorphism, pp. 859-867 in this issue. Photo credit: Ken Whitney (2004)