PatArizona

I have one...interesting speciman...

If that ID is correct, here's some data:

Lysiloma microphylla v. thornberri, Feather Bush, Desert Fern
Family – Fabaceae (Pea). Native only to Southeastern Arizona…Rincon Mountains, 2800’-4000’.

Fabaceae family is on the Arizona protected species list.
Deciduous (cold and drought). Damage below 30ºF. Drops leaves in spring, just before releafing.
Blooming: Spring…creamy white, puff ball flowers.

CARE:
Likes full sun. Protect from frost and cold wind. Hardy to 30ºF…damage below 32ºF.
Water liberally (grows faster)…sparingly in winter, to keep soil evenly moist.
Feed weekly during growing season.
Repot every other year…when buds start to swell.
Pruning: Continually trim back new growth during growing season.
Wire: Anytime.

Again, if it is a Lysiloma, you may be fortunate to have obtained it since it is on Arizona's protected species list.

Take good care of it.

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BONSAI isn't about surviving in a storm, rather, how to dance in the rain.
THE ONLY WAY: Always remember, and don't ever forget, that whatever you read here is not cast in concrete... the intent of any advice is to help. In no way should you feel that I’m saying that my way is the only way…heaven forbid! I've seen far too much of the "my way or the highway" attitude in bonsai as well as in other areas of life.