Engler system
References to the Engler system may imply an edition of the "Syllabus der Pflanzenfamilien" or "Die Natürlichen Pflanzenfamilien". The different approaches between the two works and the different editions has resulted in inconsistencies in the descriptions of the system. A number of references to the Engler system actually refer to later revisions ('modified Engler system') undertaken by Melchior and colleagues, the 12th edition of the "Syllabus" (1964). Many of the world's herbaria have been organised on the Engler system, particularly in North America and in Europe other than Britain. The Engler system is also reflected in his mult-volume collaborative work, begun in 1900, "Das Pflanzenreich: regni vegetablilis conspectus".