Isoplexis

Isoplexis is a section of 4 species within the genus Digitalis. The species of section Isoplexis differ from other plants in the genus Digitalis in that their monosymmetric (sometimes called zygomorphic) flowers have a distinctive large upper lip rather than large lower lip and the species are endemic to the Canary Islands (the species D. canariensis, D. chalcantha, and D. isabelliana) and Madeira (D. sceptrum).