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Vine
Ruderal
This could be Aristolochia littoralis - they are of interest here in Australia : have a read of this "The plant is native to Brazil, and is an invasive species in Australia and in the southern United States. In Australia the Aristolochia littoralis is fatal to the caterpillars of Ornithoptera euphorion and of the threatened Richmond Birdwing Butterfly and threatens to displace their proper host plant, A. tagala" - Wikipedia
http://en.wikipedia.org/wiki/Aristolochi...
I do find these flowers very attractive.
Fantastic! Thank you for narrowing my search...only to open it up again when discussing Aristolochia as a genus:). Thank you for your feedback!
You know they have a false opening in the yellow center to goes to the pipe on the back.