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This issue's cover: Milkwort jewelflower (Streptanthus polygaloides Gray), on a serpentine rock outcrop, which has naturally high concentrations of nickel and other heavy metals, hence the sparse vegetation and greenish cast of the rocks. See Davis et al., "Nickel Increases Susceptibility of a Nickel Hyperaccumulator to Turnip mosaic virus," p. 87-90.