Engler system
The other major work was "Die Natürlichen Pflanzenfamilien" (1887-1915) written with Karl Anton Prantl in 23 volumes. An incomplete second edition was issued in 28 parts (1924-1980). "Die Natürlichen Pflanzenfamilien" consisted of a complete revision of plant families down to generic level and often even further. "Die Natürlichen Pflanzenfamilien" is still considered one of the few true World Floras. Finally there was the also incomplete "Das Pflanzenreich" (1900–1968), a multi-authored work which attempted to provide a modern version of Linnaeus' "Species Plantarum" (1753). The Engler system rapidly became the most widely used system in the world.