 Two "Isoplexis" species, "D. canariensis" and "D. sceptrum", were first described by Linnaeus in 1753 as part of the genus "Digitalis".Since then the section has undergone several changes, the addition of two more species and more importantly being moved to a separate genus, under the genus name of "Isoplexis" or sometimes "Callianassa", back and forth many times (Lindley 1821, Loudon 1829, Bentham 1835, Webb 1845, Wetstein 1891, Himmelbaeur and Zwillinger 1927, Werner 1960-1966, Heywood 1972).The position of "Isoplexis" as a section within "Digitalis" was finally proven by Carvalho in 1999 using molecular data and published by Brauchler et al.