An order of flowering plants, division Magnoliophyta (Angiospermae), in the subclass Hamamelidae of the class Magnoliopsida (dicotyledons). The order consists of a single family, genus, and species, Eucommia ulmoides, of China. It is a simple-leaved tree with reduced, solitary flowers that lack a perianth, and leaves without stipules, the paired basal appendages found on many leaves. The ovary has two unitegmic (with a single integument) ovules and ripens into a one-seeded, winged fruit. It is widely cultivated as an ornamental.