Verbatim text: Pfeifer, H. W. 1966. Revision of the North and Central American hexandrous species of Aristolochia (Aristolochiaceae). Ann. Missouri Bot. Gard. 53: 1-114.
Author: Pfeifer, H.W.
Year: 1966
Title: Revision of the North and Central American hexandrous species of Aristolochia (Aristolochiaceae)
Journal: Ann. Missouri Bot. Gard
Volume: 53
Pages: 1–114
BHL link: http://www.biodiversitylibrary.org/part/4247