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For a wider view of this location see > Link. Hawthorn (Crataegus monogyny or Crataegus laevigata) grows in northern Europe, Asia and North America. A supplement concoted from its flowers, leaves and berries has been promoted for decreasing blood pressure, treating angina, and improving the ability of the heart to pump blood for patients with mild congestive heart failure. Other uses include use as a cardiac tonic as well as an antisclerotic. It is also considered an antispasmodic, a diuretic, a carminative, an astringent, an anti-diarrhea, and believed to aid digestion and assimilation and to curb the appetite.