Source : WordNet®

subclass Magnoliidae
     n : 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; contains 36 families including Magnoliaceae and
         Ranunculaceae; sometimes classified as a superorder [syn:
          {Magnoliidae}, {ranalian complex}]