Perhaps 150 species in the temperate regions of the Northern Hemisphere, of which 100 occur in the FSU with most in the Far East and East Siberia, and only a few in Central Asia and the Caucasus. Some are known in cultivation. All parts, especially the roots, are very poisonous and used for medicinal purposes. Good for the wild garden and perennial borders.
p>Two other species from the Far East have been tested and recommended for zones 4 or 3: