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Periwinkle is sometimes recommended for circulatory problems--particularly in the brain--but there is no evidence of its effectiveness. In homeopathic medicine, it's used, again without evidence of effect, for hemorrhages and skin conditions. Originating in northern Spain, western France, and central and southern Europe, this familiar ground-hugging evergreen shrub can now be found throughout the world. Its purplish-blue flowers won it the name "Sorcerer's Violet" in the Middle Ages.
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