I found this peculiar vine growing on isla Cebaco, off the Pacific coast of Panama. It looks very closely related to Dioscorea elephantipes, but thank you to a reader I think it may be Dioscorea mexicana. As you can see in the photos, it has this very odd knobby, woody, stump. The vine, which you can see better in the second photo, can be seen growing out of the right hand side of the stump. These odd protrusions are reminiscent of a dinosaur. Unfortunately I didn't get photos of the leaves. I did, however, collect a few nodes of the vine itself (in addition to the stump) and am expecting it to sprout back soon, as it appears to be a fairly resilient plant. .