Engler system
The Dahlgren system and Thorne system (1992) recognized such an order and placed it in superorder Proteanae in subclass Magnoliidae [=dicotyledons]. The Engler system, in its update of 1964, also recognized this order and placed it in subclass Archichlamydeae of class Dicotyledoneae. The Wettstein system, last revised in 1935, recognized this order and placed it in the Monochlamydeae in subclass Choripetalae of class Dicotyledones. These systems used the following circumscription: