Black haw has been used traditionally as a uterine tonic (to aid in childbirth) and for the prevention of abortion and miscarriage. Native to southern and mid-North America, the root bark of this shrubby tree is also used for the after-pains of childbirth The reddish-brown inner surface of the bark has a bitter, astringent taste, and produces an antispasmodic effect on the female reproductive system.