The South American drug Micania Guaco4) is obtained either from Aristolochia Sellowiana, Duch. or A. macroura, Gom. According to O. Tunmann, it is to be designated Rhizoma Aristo-lochias Paraguay for the present.

It contains 1 p. c. of a light yellow oil of a pleasant, minty odor and a burning, cooling taste. d15o0,853; aD - 9°35'; A. V. 4,06; S. V. 16,25. Upon distillation the bulk of the oil distilled over at 240° (760 mm.) or 160 to 170° (65 mm.). It contains a crystalline acid, a crystalline phenol, an ester and a terpene-like substance.