Mesquite and underneath

As I'm looking to make my little corner of the world a small - really small - food forest, I'm looking at legumes of all kinds. I'm also trying to make this as compatible with the local wildlife as I can, so we can all live together a bit more peacefully. The poor rattlers are left out in the cold, for now, kept out of the backyard, but when the kids are grown and gone, I think they can come back in and visit if they like. 

Today I'm focusing on the velvet and honey mesquite trees, or specifically, what I can grow near my mesquite trees.

The native mesquite is the big tree on the left there