They are seeds which produce something known as a Hyacinth Bean. One of my friends refers to it as a Thomas Jefferson plant. Apparently Jefferson grew them on his property in Virginia.
As you can see, the flowers are almost shell-like and the vine climbs just about anything (in this case, the telephone pole located in front of the grape trellis).
As you will see in the next photo, pods form and once they are ready to be picked, the seeds that are inside look just those shown above...like itty bitty Oreo cookies!
Cool, huh? Thanks, Mr Jefferson!