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In the Cronquist, Dahlgren, Goldberg and Reveal systems it is composed of a single family, the Aristolochiaceae. In the Hutchinson system the carnivorous Nepenthaceae (now placed in Caryophyllales) and the parasitic Cytinaceae (now placed in Malvales) and Hydnoraceae (now placed in Piperales) are also included. In the Melchior (aka Engler) system Hydnoraceae and Rafflesiaceae (including Cytinaceae) are included in addition to Aristolochiaceae.
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