Quercus canbyi Trel.

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Quercus canbyi (Canby oak, Sierra oak) is a rare North American species of oak tree.

Quercus canbyi is a semi-evergreen - evergreen tree, up to 40–50 feet (12–15 metres) tall in cultivation. Although, it can reach up to 80 feet (24 metres) in the wild in Mexico. It starts as a pyramidal form and then matures into an open irregular shape. It can reach a spread of 30–40 feet (9.1–12.2 metres) wide.

The dark, glossy green leaves are 6–8 inches (15–20 centimetres) long and have serrated edges. The petioles can have a reddish hue. It blooms in March and the acorns are then seen in August.

It is very similar in form to Quercus graciliformis but they differ in twig shape. Q. graciliformis also has slender acorns and is biennial. Q. canbyi produce acute acorns in one year.

The species has been found only in Texas and in northeast Mexico.

Quercus canbyi - Wikipedia

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