A list for Paradise Valley ..
http://www.ci.paradise-valley....
There's several which look similar and they are not all Acacia.
Could you take a closer photo of the leaves?
Pithecellobium flexicaule is similar but the leaves look to be more closely attached to the stem.
http://texastreeplanting.tamu....
Sophora secundiflora .. the leaves don't look to have much of a stem attaching them to the main stem but you might know what the seed pods looked like.
https://selectree.calpoly.edu/...
Could it be Desert Ironwood, Olneya tesota?
http://apps.cals.arizona.edu/a...
https://www.google.co.uk/searc...
