thorny tree (palo verde??) in need of help
first off, i have a thorny tree in my front yard and i am unsure of its name. i think it might be a type of palo verde but i cant be certain. second, i think it might have some sort of a problem because it has lost the few leaves it had and it is changing from green to a brown, almost lifeless color. i am unsure of whether it might need more or less water (it is on a drip system with a 4 gph head for 8 minutes twice a day). also, the bark appears to be cracking in some places and i peeled a piece off (see photo) to discover a blackish color.
thank you for your time