Compare with Sesbania.

HTH
CHris

Here is a link that might be useful: {{gwi:336636}}

More images.

Here is a link that might be useful: {{gwi:336637}}

Thank you Saltcedar ! sesbania punicea matches prety well.

Is it possible you may give me some hint about other sesbania. This small seed pod was given to by someone who at least told the genus and show me a picture of a red flower, and said it was also a south american native tree. Y didn't find much info on this genus, and it seems very variable, from trees, to bushes to runners. No picture seem to have this small seedpod (it contains 4 beans) also already sprouted.

Thanks. Paul

{{gwi:336641}}