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Mexican Blue Oak

Quercus oblongifolia

Mexican Blue Oak, Quercus oblongifolia, © by Michael Plagens

In Madera Canyon, Sta. Rita Mts., Arizona, USA. 10 Sept. 2010.

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TREE: Medium-sized tree with heavy, often crooked branches with dark to light gray, deeply furrowed bark. Typically, mature trees are mostly less than 14 m tall. Older trees often have widely spreading branches.

FLOWERS: Greenish-yellow flowers are small and in many-flowered, pendulous catkin-like spikes.

LEAVES: Leaves are evergreen and leathery. The upper surface is blue-green, the lower paler with short hairs. Leaf margins of the obovate leaves are mostly smooth and without lobes.

RANGE: Mexican Blue Oaks are found in south central Arizona and northern Sonora. Moving away from this center more and more will have traits that merge into Gray Oak, Arizona White Oak and also Scrub Live Oak.

FRUIT: Acorns.

UNARMED. Without thorns.

Fagaceae -- Oak Family

a cynipid gall on Mexican Blue Oak, Quercus oblongifolia, photo © by Michael Plagens

Gall caused by the presence inside of minute larvae of a gall wasp (f. Cynipidae). Observed in Madera Canyon, Arizona, USA. Sept. 2010.

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Arizona Naturalist
Sycamore Canyons
The Flora of Arizona's Sycamore Canyons


Copyright Michael J. Plagens, page created 22 September 2013