Cynanchum laeve

Sand Vine (Cynanchum laeve) is a species of plant.  It is also known as Honeyvine, Honeyvine Milkweed, Bluevine Milkweed, Climbing Milkweed, and Smooth Swallow-wort.  It belongs in the subfamily Asclepiadoideae.  It is native to North America.  It blooms from June to August.  This species is found in a variety of habitats such as edges of woodlands, near stream edges, gardens, and fields.  This vine can grow to be 6 or more feet long.

Other websites

Cynanchum laeve at USDA PLANTS Database
Cynanchum laeve at Kansas Wildflowers and Grasses 

Category:Apocynaceae