Cramp Bark

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Related to cranberry bush: American cranberry bush
A deciduous shrub, the bark of which contains valeric acid, tannin, viburnin, bitter resin, and vitamin C; it is antispasmodic and used for pregnancy-related menstrual cramps and other forms of colic
Toxicity Uncooked berries are poisonous and may cause GIcolic

black haw

(blak haw)
A small tree (Viburnum prunifolium), the leaves of which are of purported value as an aid to gynecologic disorders, as a therapeutic in pregnancy, and as a topical astringent.
Synonym(s): American sloe, cramp bark, nannyberry, sheepberry, shonny.
References in periodicals archive ?
American cranberry bush is also native to North America.
There are cultivars of American cranberry bush that have been selected for their fruiting qualities.
I have not made jam from American cranberry bush berries, but have read that the berries emit a musty odor when they cook, which some people find objectionable.