Aristolochia

Recent phylogenetic analyses using morphology, DNA sequences, and chromosome numbers supported the division of Aristolochia into multiple segregate genera. The system of Kelly 
and González (2003), where Aristolochia s.l. was subdivided into four genera, is followed here. The results of Ohi-Toma et al. (2006) also provided support for this system; however, they chose to recognize only two genera. In either case, most of our species reside in genera other than Aristolochia.