Brassicaceae is small bloom but grows up to half a meter tall, The plant from San Angelo State Park is woody like a shrub or small tree
I believe that Berberis have been lumped into Mahonia. So now Mahonia trifoliolata. http://en.wikipedia.org/wiki/Mahonia_trifoliolata
The genus Berberis as recognized below is divided into two genera, Berberis and Mahonia , by some authors (e.g., L. Abrams 1934). Species 1-5 below represent Berberis in the narrow sense (characterized by dimorphic stems, with elongate primary stems and short axillary shoots; leaves of primary stems modified as spines; foliage leaves simple; and inflorescences usually rather lax, with acuminate bracteoles and 1-20 flowers; most species susceptible to Puccinia ). Species 13-22 represent the segregate genus Mahonia (with stems never regularly dimorphic; stem spines absent; leaves pinnately compound; and inflorescences dense, with rounded or obtuse [rarely acute] bracteoles and 25-70 flowers; never susceptible to Puccinia ). Species 6-12, traditionally included in Mahonia when that genus is recognized (L. Abrams 1934), are actually intermediate, resembling Berberis proper in their dimorphic stems, inflorescence structure, and susceptibility to Puccinia , and Mahonia in their spineless stems and compound leaves. Species showing different combinations of the characteristics of the two groups are found in other parts of the world (J. W. McCain and J. F. Hennen 1982; R. V. Moran 1982), so these segregate genera do not seem to be natural. Mahonia is often recognized in horticultural works, but it is seldom recognized by botanists. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=103816
The locals call it a currant, because the red berries (not yet appearing) are edible. So it definitely fits as a Berberis trifoliolata.
