family of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

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; sometimes classified as a superorder

chiefly tropical trees or shrubs

shrubs or herbs

shrubs or small trees having aromatic bark; the eastern United States and eastern Asia

coextensive with the genus Ceratophyllum: hornworts

one genus

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; sometimes classified as a superorder