Dregea volubilis.

Botanical name: 

Dregea volubilis Benth. Asclepiadaceae.

East Indies. "I have been informed," says Ainslie, "that the leaves are amongst those which are occasionally eaten as greens by the natives of lower India but I am doubtful of this, considering the general character of the genus."

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.