This specimen fits the species description very well, except for the hairiness of the leaves. (Notice the tiny hairs on the upper and lower surfaces of the leaf blade. They are approximately 0.1-0.2 mm long.) Flora of North America describes the leaf blade surfaces as "abaxially and adaxially glabrous." The second edition of the Jepson Manual also agrees with this description.
After looking at specimens from the Jepson and UC Berkeley Herbarium, I decided that they didn't literally mean glabrous, but rather that the leaf blades appear glabrous.
Specimen numbers UC1135915, UC1135903, UC848384, UC1135900, UC5830 were particularly helpful in making my identification. All five specimens were confirmed by John Tucker as Q. wislizeni var. frutescens and shared similar leaf characteristics as my specimen.
Leaves are hairy on both sides, but not densely hairy or glandular.
They are shrubs or small trees. Not sure what family it's in but we think it's an ornamental.