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Cover Illustration: Flower of Trigonidium egertonianum, an orchid in the subtribe Maxillariinae. Flowers of Trigonidium are pollinated by pseudocopulation by meliponine bees attracted to the bluish petal apices; the bees attempt to copulate with the flowers and become trapped in the funnel-shaped flowers. On the basis of molecular data, Trigonidium was found to be embedded in the large polyphyletic genus Maxillaria. See Whitten et al.-Molecular phylogenetics of Maxillaria and related genera (Orchidaceae: Cymbidieae) based on combined molecular data sets, pp. 1860-1889 in this issue. Photo credit: Mark Whitten.