Nickel (Ni) hyperaccumulation is a rare form of physiological specialization shared by a small number of angiosperms growing on ultramafic soils. Molecular phylogenetic analyses by Cecchi et al. reveal that Ni-hyperaccumulation has a double origin in Alysseae. Genetic continuity and strong phenotypic plasticity in the A. murale complex call for a reduction of the number of Ni hyperaccumulator taxa formally recognized.
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