The Melchior system, "a reference in all taxonomic courses",[1] is a classification system detailing the taxonomic system of the Angiospermae according to A. Engler's Syllabus der Pflanzenfamilien (1964),[2] also known as "modified or updated" Engler system.
The collaborators in orders (and some families) were the following:
Note: Sonderothamnus R.Dahlgren, 1968 is posterior to the publication of this work, and Stylapterus A.Juss. was included by G. Bentham & J.D. Hooker in Penaea.
Note: the classification of Thymelaeaceae was based on Domke 1934.[3]