Sometimes classified as a superorder

• Contains 36 families including Magnoliaceae and Ranunculaceae
• A group of families or trees and shrubs and herbs having well-developed perianths and apocarpous ovaries and generally regarded as the most primitive extant flowering plants

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Magnoliidae \Magnoliidae\ n. a group of families of trees and shrubs and herbs having well-developed perianths and apocarpous ovaries and generally regarded as the most primitive extant flowering plants; contains 36 families including Magnoliaceae and Ranunculaceae ...

Wikipedia Word definitions in Wikipedia
Magnoliidae is a botanical subclass name; it may refer to: Magnoliids , a major group of basal angiosperms. Magnoliidae sensu Chase & Reveal , a botanical subclass consisting of all angiosperms. In the Dahlgren and Thorne systems, a group consisting of ...