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Aristolochia is a fascinating genus. Do you have pictures of your A. zollingeriana? I've not seen it before....
Perhaps these may be of use ...........http://images.google.co.uk/search?q=%22Aristolochia+zollingeriana%22&biw=1366&bih=643&sei=fEbBT7-iEJGyhAeU1NCaCg&tbm=ischhttp://