Paeonia (pe-o-ne-a), commonly known as peony, is the only genus in the family Paeoniaceae. They are native to Asia, Southern Europe and Western North America. Estimates of the number of species range from 25 to 40. Most are herbaceous perennial plants but some resemble trees up to 10 feet tall. They have compound, deeply lobed leaves and large, often fragrant, flowers, ranging from red to white or yellow, in late spring and early summer.