Cover illustration: Flowers of the peloric variant of the common toadflax, Linaria vulgaris, show a ventralized phenotype where the lower petal lobe with its spur is repeated five times. This rare natural variant is not derived from a nucleotide mutation but is an epigenetic phenomenon comprising a stable, heritable hypermethylation of both copies of one gene locus. See Grant-Downton and Dickinson (pp. 1143–1164).
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