OK - A tree in Mérida, Yucatán. I've tried numerous search terms, but no luck so far. Some details: Capsule - Winged (?) or fringed (?), segmented, dehiscing longitudinally, 5 – 7 seed, ovoid, occasionally pointed either or both ends. 2.5 – 6 cm long. Leaf - Bipinnate, 8 pinnae, 14 ovate leaflets: 4 – 5 mm x 2- 3 mm. Fold on touch. Have been all through Mimosoidaeae, but can find nothing that includes a capsule with the trim around the edge (not sure re terminology. No prickles, thorns or spines that I could feel. May or may not be Mexican native.
I think this is Mimosa pudica(The species is native to South America and Central America, wikipedia), we saw it a few days ago in Bloedel Conservatory, Vancouver.
Yes - I think Mimosa - the trouble has been finding one with a seed pod that matches. That tissue around the edge doesn't appear in anything I've found so far. I'm not sure if it's called a wing, or some other name.
