What was the name of this kind of grape?

(-------------, Miami, FL, ca. 1986. Credit: Historical Museum of Southern Florida.)

During the Depression in Miami people began to appreciate the natural abundance of things that could be grown here.  Newcomers discovered that a delicate lavender jelly could be made from the _________ grape found near the beach, including South Florida, the Bahamas, Barbados and the Bahamas.

 

Q. What was the name of this kind of grape?

A. Sea