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Quercus phellos
Willow oak

Small acorns, 1/2" long, bear a dark red-brown cap that covers 1/4 of the brown and blackish striated broad ovate nut. Since this is a member of the red-black oak group, the acorns mature in 2 years and small first-year acorns of just under 1/8" length can be found on stems in the winter.

 
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