The Aristolochiaceae, or the Birthwort family, are a family of flowering plants with 8 genera and about 400 species belonging to the order Piperales. The type genus's Aristolochia L. The Aristolochiaceae are magnoliids, a basal group of angiosperms which aren't part of the large categories of monocots or eudicots. Some newer classification schemes, such as the Update of the Angiosperm Phylogeny Group, place the family Aristolochiaceae in the order Piperales, but it's still quite common, though… (More on Aristolochiaceae)