| Noun | 1. | subclass Dilleniidae - a group of families of more or less advanced trees and shrubs and herbs having either polypetalous or gamopetalous corollas and often with ovules attached to the walls of the ovary; contains 69 families including Ericaceae and Cruciferae and Malvaceae; sometimes classified as a superorder class - (biology) a taxonomic group containing one or more orders dilleniid dicot family - family of more or less advanced dicotyledonous trees and shrubs and herbs dilleniid dicot genus - genus of more or less advanced dicotyledonous trees and shrubs and herbs class Dicotyledonae, class Dicotyledones, class Magnoliopsida, Dicotyledonae, Dicotyledones, Magnoliopsida - comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae Malvales, order Malvales - Malvaceae; Bombacaceae; Elaeocarpaceae; Sterculiaceae; Tiliaceae Ericales, order Ericales - Ericaceae; Clethraceae; Diapensiaceae; Epacridaceae; Lennoaceae; Pyrolaceae; Monotropaceae Hypericales, order Hypericales, order Parietales, Parietales - a large order of dicotyledonous plants of subclass Dilleniidae Guttiferales, order Guttiferales - used in some classifications; coextensive with Parietales order Santalales, Santalales - order of plants distinguished by having a one-celled inferior ovary; many are parasitic or partly parasitic usually on roots |