| Noun | 1. | Parietales - a large order of dicotyledonous plants of subclass DilleniidaeDilleniidae, 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 Dilleniaceae, family Dilleniaceae - chiefly tropical shrubs and trees and climbers having leathery leaves or flattened leaflike stems: genera Dillenia; Hibbertia | |