Source: A Modern Herbal, by Mrs. M. Grieve.
Viburnum opulus L.—A Review of Phytochemistry and Biological Effects.
Blackhaw
Viburnum prunifolium
Viburnum, or Blackhaw, has many different common names: one of them, Guelder, comes from Gueldersland, a Dutch province, where the tree was first cultivated. This plant also resembles the Common Elder in habits of growth. Its bark, known as Cramp Bark, has been employed in herbal medicine. Some literature reports that it has been employed with benefit in all nervous complaints and debility and used with success in cramps and spasms of all kinds, in convulsions, fits and lockjaw, and also in palpitation, heart disease and rheumatism. The bark has also been used in the treatment of stomach or uterine bleeding and hemorrhoids.
Find more about this plant on Wikipedia.
