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FIG. 4. Epigenetic control of floral symmetry in Linaria vulgaris (common toadflax). Right: wild-type L. vulgaris where the Lcycloidea locus controlling dorso-ventral patterning is expressed normally. Note the zygomorphic flower with the ventral petal lobe displaying a spur. Left: the peloric epimutant shows hypermethylation of the Lcyc sequence and loss of expression of Lcyc. The flowers show greater radial symmetry as the ventral petal lobe is repeated five times. The plant shown here is homozygous for the Lcyc epiallele; heterozygotes show normal floral development.
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