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a family of dicotyledonous plants. They are perennial herbs and woody lianas; more rarely, they are erect shrubs and shrublets. The leaves are alternate, entire, and exstipulate; infrequently they are three- to five-lobed. The flowers are solitary or in inflorescences; they are often carrion-scented. There are between seven and ten genera (approximately 600 species), found primarily in the tropics and subtropics. In the USSR there are ten species of the genera Aristolochia and Asarum. Some Aristolochiaceae are cultivated as ornamentals.