This is the Silverleaf Nightshade a.k.a. Silver Horse Nettle . What's interesting about this plant is that it has the beautiful five-point starlike purplish flowers with bright yellow anthers in the center. Native Americans crushed the green berries that it produces and added them to milk and produced cheese. Fifteen species of this plant Solanum are scattered about Arizona.
Botany is strange sometimes.
I don't recommend that anyone experiment with the purported home remedies and folk uses for our native plants. It is all too easy to mis-identify plants and their use could prove to be fatal. However, it is interesting to attempt to identify our local plants and hear of their native uses. It is well worth buying for the novice or the experienced plant lover. Here are some titles that are worth having in your library.