Catclaw Acacia is a deciduous shrub or small tree with small leaflets (a legume) and mid yellow flowers. The common name comes from the hooked spines that run along the stems. They will rip and tear clothing and skin. I usually return from hikes with several wounds, especially if any bush whacking is involved. They look harmless but they are not.
The Indians harvested the younger seed avoiding the mature seed which contains toxic chemicals. The dried seed than would be ground and eaten.