Aristolochia

Aristolochia
Aristolochia labiata
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Magnoliids
Order:	Piperales
Family:	Aristolochiaceae
Subfamily:	Aristolochioideae
Genus:	Aristolochia L.[1]
Species
Over 500, see text
Synonyms
Hocquartia Dum. Holostylis Duch., Ann. Sci. Nat., Bot. sér. 4, 2: 33, t. 5. 1854. Isotrema Raf. (disputed)

Aristolochia (English: /əˌrɪstəˈloʊkiə/) is a large plant genus with over 500 species that is the type genus of the family Aristolochiaceae. Its members are commonly known as birthwort, pipevine or Dutchman's pipe and are widespread and occur in the most diverse climates. Some species, like A. utriformis and A. westlandii, are threatened with extinction.

Isotrema is usually included here, but might be a valid genus. If so, it contains those species with a three-lobed calyx.