There are 5 species of Aristolochia in the state Pernambuca, N-E Brazil:
-Aristolochia birostris
-Aristolochia labiata
-Aristolochia papillaris
-Aristolochia sepicola
-Aristolochia trilobata
http://floradobrasil.jbrj.gov....
I only found one picture of the flower of Aristolochia papillaris
https://www.flickr.com/photos/...
and a botanical drawing also illustrating the seedpod:
http://www.scielo.br/img/revis...
Aristolochia labiata is also a candidate..
https://www.google.be/search?q...
Aristolochia sepicola, only found a flower photo;
https://www.flickr.com/photos/...
The other two species don't have a leaf match.
If you get a flower on your plant, it would give you a sure id.
