Narrow-leaved Snakeroot Pelican-flower Sangree-root Serpentaria

Serpentary Snagrel Snakeweed Virginia Serpentaria

Aristolochia serpentaria L.

Aristolochia serpentaria var. hastata (Nutt.) Duchartre

Together the segregate genera Endodeca and Isotrema form a very well supported clade that is morphologically, molecularly, and cytologically distinct from the rest of Aristolochia sensu lato (Kelly and Gonz?lez 2003, Neinhuis et al. 2005, Ohi-Toma et al. 2006, Wanke et al. 2006). These authors work strongly supports Hubers (1993) taxonomic alignment which recognizes Endodeca and Isotrema as distinct genera. Ohi-Toma et al. (2006), while supporting the recognition of segregate genera within Aristolochia s.l., chose to lump Endodeca under Isotrema because the two share the same chromosome number but their work also strongly supports the recognition of the two as distinct at the generic level with the choice somewhat subjective. We currently recognize Endodeca (E. serpentaria) and Isotrema (I. macrophyllum, I tomentosum) as distinct from Aristolochia (A. clematitis) following (Huber 1993, Kelly and Gonz?lez 2003, Neinhuis et al. 2005). A few taxa (all occurring south of New York) have been described within Endodeca serpentaria (e.g. Aristolochia hastata, A. convolvulacea) sometimes at the infraspecific level. We follow recent authors (Gleason and Cronquist 1991, Berringer 1997) in recognizing only one variable taxon.