Magnoliopsida is the botanical name for a class: this name is formed by replacing the termination -aceae in the name Magnoliaceae by the termination -opsida (Art 16 of the ICBN). The class will necessarily include the family Magnoliaceae, but it is not otherwise fixed. The circumscription of this class will vary with the taxonomic system that is being used.
Cronquist and Takhtajan systems
In the Takhtajan system and the Cronquist system the name is used for the group known as dicotyledons.
Magnoliopsida in the Takhtajan system
The Takhtajan system used this internal taxonomy:
