Mystery Leaf

This is the leaf I collected on my last run. Have not identified it yet, but it is a common tree along the American River.

UPDATE: It's Quercus wislizeni, the Interior Live Oak. :) Thanks to my friend Lanna for the identification.

Facts from Farmer Fred (above link):

• A native of the California Sierra Nevada foothills
• Evergreen tree, spreading dome shape.
• 75-80', more wide than tall.
• Medium rate of growth.
• Leaves remain for two years.
• 1 1/2" acorns
• Can tolerate clay and rocky soils
• Can take aridity, sun, wind, heat, dust.
• Half hardy to 15 degrees.
• Refrigerate acorns for 30-45 days, then plant in ground.
• Drought tolerant.
• Relatively free of pests and diseases.