It is in Fabaceae I'm sure, I brought up a list of plants in the family for the Atlantic Rainforest. (the link is now giving all of Fabaceae but a new search can be done.)
http://reflora.jbrj.gov.br/jab...
Luetzelburgia trialata is interesting, I can't find that species but other newly found species have seed pods like yours.
https://www.google.co.uk/searc...
