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Cover Illustration: A hawk moth (Basiothia schenki, Sphingidae) visiting the night-flowering Zaluzianskya natalensis (Scrophulariaceae; upper left) and a long-proboscid fly (Prosoeca ganglbauri, Nemestrinidae) visiting the day-flowering Z. microsiphon (lower right). These two plant species occur sympatrically on Mt. Gilboa, South Africa. Morphological and inter-simple sequence repeat (ISSR) data support the hypothesis that gene flow is occurring between these species despite their apparent ethological isolation. See Archibald et al.: Hybridization and gene flow between a day- and night-flowering species of Zaluzianskya (Scrophulariaceae s.s., tribe Manuleeae), pp. 1333-1344 in this issue. Photo credit: Steven D. Johnson and Mark E. Mort.