"Genus: Aristolochia L."Germplasm Resources Information Network. United States Department of Agriculture. 2009-01-30. Archived from the original on 2009-05-07. Retrieved 2011-01-08.
web.archive.org
"Genus: Aristolochia L."Germplasm Resources Information Network. United States Department of Agriculture. 2009-01-30. Archived from the original on 2009-05-07. Retrieved 2011-01-08.