Aristolochia lassa I.M. Johnst. in J. Arnold Arbor. 21: 255. 1940 sec. Paizanni Guillén, A. 2016
Holotype: Mexico, Coahuila: Mun. Saltillo, common in bottom lands, May 1898, Palmer 187 (GH [fide Paizanni Guillén, A. 2016]); Isotype: Mexico, Coahuila: Mun. Saltillo, common in bottom lands, May 1898, Palmer 187 (BM,K,MO,UC) [fide Paizanni Guillén, A. 2016]
- =Aristolochia watsonii sensu Pfeifer Taxon. Re. Pentand. Sp. Aristolochia, 53. 1970. syn. sec. Paizanni Guillén, A. 2016