Cramp Bark

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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
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012