1. plant [is] a tree
2. leaves flat, bluish-gray or grayish-green .... Engelmann oak, Quercus engelmannii
2' leaves with edges curled downward, green ..... coast live oak, Quercus agrifolia var. agrifolia
1' plant [is] a shrub
3. leaf margin mostly with no teeth or very minor teeth, leaves often longer than 30 mm (1.2") .... hybrid scrub oak, Quercus berberidifolia X Q. engelmannii
3'. leaf margin mostly with evident teeth, leaves mostly less than 30 mm (1.2") long .... scrub oak, Quercus berberidifolia
Comments and feedback: Tom Chester
Last update: 16 October 2003.