That's the same vine I have, and from pics on the internet, wild cucumber was the only thing that looked close to it, but the pics weren't quite clear enough. How neat that you have passion flower growing wild. I wonder if it is an "escaped' plant or is actually a native? I planted it here some years ago, but it went away after only one or two years. It's so neat that our "community" here will work to answer questions of about any kind! Thanks.
Yes, passion vine is native to Oklahoma