The 3 most common Vicia species in Dallas are V. sativa, V. villosa and V. ludoviciana. Vicia sativa has the very conspicuous sharp thorn-like tips on it's leaflets, and is more sparsely blooming, with only 1 or 2 flowers per vine instead of a larger cluster. This is Vicia sativa. There is a subspecies Vicia sativa subsp. nigra. Checking for subspecies requires a ruler.

I'd go with sativa given the visible leaf points and sparse flowers.