What vine is this, its found along side the highway?

Question

Its found along the highways in the Desert South West. Has a single yellow vine with single heart shaped bluish waxy leaves, and it creeps along the ground, it does not appear to bare fruit or have any type of thorns.It is quite prolific.

Answer 1

Could it be black-eyed Susan vine (Thunbergia alata)?

http://en.wikipedia.org/wiki/Thunbergia_...

http://www.plantzafrica.com/planttuv/thu...