Here's another vine flower that looks rubbery and grows up all sorts of trees here in the Riviera Maya Mexico. Any idea what it is? Thanks.
Maybe Vigna caracalla, snail vine? -If you could also post pics of the entire plant and of the leaves, I am sure someone here could id it for you conclusively.
Here is a link that might be useful: Vigna caracalla, snail vine
Phaseolus speciosa or a close relative. Keel petal is curled into a bent S-shape. P. caracalla Flower makes several corkscrew turns in one direction.
I checked out the photos of the Vigna caracalla, snail vine and it's exactly the same flower. Thanks susanc.
The photos on that site are mislabeled. In my link, see figure 8, C & D (Cochliasanthes = caracalla) vs. fig. 10, E (Sigmoidotropis, the group that includes speciosus , elegans, ampla, etc.)
Here is a link that might be useful: Delgado-Salinas et.al. on American