Eucommia ulmoides Oliv , alias Eucommia ulmoides Oliv. Neem bark, silk cotton bark, cotton bark and eucalyptus bark are the dry bark of Eucommia ulmoides Oliv. Is a precious nourishing medicinal material in China. Sweet in taste and warm in nature. It can be used for treating lumbago and leg pain or soreness caused by kidney-yang deficiency, fetal instability caused by liver-qi deficiency, scrotum wet itching, etc. A medicine of Eucommia ulmoides Oliv. It is said that a man named Eucommia ulmoides. Because of taking this medicine, he gained enlightenment, and later generations named it Eucommia ulmoides Oliv.