The large genus Aristolochia is a very diverse assemblage evidently best split into several genera (see Ohi-Toma et al. 2006), though they suggest that Endodeca may be best placed into Isotrema.
All species found in Aristolochia
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 23, 2017. http://michiganflora.net/genus.aspx?id=Aristolochia.