Vine Identification

can someone help me identify this vine? It is growing over the fence in my backyard. I have a desert tortiose and don't know if it is poisenous for him.

 

Not for sure from the photos. Does the flower smell like grape? If it does, then it is not grape.

 

Possibly a double form of butterfly pea (Clitoria). However, there are many kinds of pea family plants.

 

Looks and sounds like a Legume to me.

 

Vigna caracalla?

 

Snail vine seems better. You can see the curling in the flowers. I actually had that in the back of my mind--which is where it stayed.

 

I have been doing some research and I believe it might be a nevada pea. What do you think?

 

I just looked up pics for snail vine......Your right! that is it! THANKS DUDE! Now I just need to find out if it is a poisonous plant! Thanks again! Julie