pyrocantha

In both the East and West, hawthorn has been used for millenia as both a food and a medicine. The current use of hawthorn for heart conditions dates back to the 17th century, according to the French doctor, Leclerc. Green, an Irish doctor, is known to have used it extensively--though secretly--for heart ailments. After his death in 1894, his daughter revealed the famous cure to be a tincture of the ripe berries of Crataegus oxycanthus. In Europe, both homeopathic and allopathic doctors used the herb for various heart and cardiovascular ailments from the late 19th through the early 20th centuries--and with great clinical success. Hawthorn had entered American clinical practice by 1896--only to fade from use in the 1930s.
The extract of hawthorn can increase blood flow to the heart muscle itself, helping to counteract one of the most common modern causes of death in industrial countries--heart attack due to lack of blood flow to the heart. In pharmacological tests on both animals and humans, hawthorn has been shown to improve the contractility of the heart muscle (which can lead to a stronger pumping action of the heart), increase cardiac performance and output, lower the peripheral vascular resistance (reducing the workload of the heart), steady the heartbeat (antiarrhythmic effect), as well as increasing the heart's tolerance to oxygen deficiency, such as might happen during stress or excitement, or in diseases where the arteries are partially blocked.

In Europe, thousands of doctors prescribe hawthorn to prevent cardiovascular disease or to help alleviate symptoms of mild to moderate problems. It is considered so safe that it is sometimes prescribed concurrently with heart medications such as digitalis. Hawthorn is also considered a mildly calming herb for the nervous system--an appropriate bonus considering that stress and nervousness often accompany cardiovascular problems.