[1][2] It was developed by August W. Eichler (1839–1887), initially in his Blüthendiagramme (1875–1878) and then in successive editions of his Syllabus (1876–1890).
[3][4][5] After his death his colleague Adolf Engler (1844–1930) continued its development, and it became widely accepted.
[6] Moreover, Eichler was the first taxonomist to separate the Phanerogamae into Angiosperms and Gymnosperms and the former into Monocotyledonae and Dicotyledonae.
[7] His primary ranks were Divisions (Abtheilung), followed by orders (Reihe).
V–VIII Synopsis: The system (here taken from the 4th edition of the Syllabus, 1886) divides plants into divisions, classes and groups.