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Quercus incana W. Bartram
Bluejack oak, Sandjack oak, Upland willow oak, Cinnamon oak, Shin oak, Turkey oak
Synonym(s): Quercus cinerea
USDA Symbol: QUIN
USDA Native Status: L48 (N)
Thicket-forming shrub or small tree with an irregular crown of stout, crooked branches and distinctive, blue-green foliage. A shrub or small tree that grows up to 55 feet (16.8 m), with irregular spreading open crown, often forming thickets. BARK: thick dark gray to black, wide furrows forming rough square plates. TWIGS and BUDS: brown twigs, densely pubescent when young; reddish-brown buds, narrowly ovoid and 5-angled in cross-section, often with hairs at apex. LEAVES: short, pubescent petiole less than 3⁄8 inch (10 mm) long; leaf
is narrowly ovate to elliptical, 1 1⁄8 - 4 inches (29 - 101 mm) long 1⁄2 - 1 3⁄8
inches (13 - 35 mm) wide, base acute to rounded, apex acute with a bristle-tip, margin is entire (juvenile foliage may have 2 - 3 shallow lobes), thick and leathery, upper surface shiny bluish- green with raised veins and sparsely pubescent along midrib, pubescence beneath with axillary ￼tufts of hair.
Easily recognized by the distinctive deciduous leaves. The common name refers to the shiny blue-green foliage, while the Latin species name, meaning hoary, describes the gray-green undersurface. The largest known specimen grows in Pasco County, Florida.
Plant CharacteristicsDuration: Perennial Habit: Shrub
, Tree Leaf Retention: Deciduous Leaf Arrangement: Alternate Leaf Complexity: Simple Leaf Shape: Elliptic
, Ovate Leaf Venation: Pinnate Leaf Margin: Entire Leaf Apex: Acute Leaf Base:
Rounded Leaf Texture:
Leathery Breeding System:
, Monoecious Inflorescence: Catkin Fruit Type: Nut Size Notes:
Grows up to 55 feet (16.8 m). Leaf:
Upper surface shiny bluish- green. Fruit:
Acorns biennial; 1 - 2 nuts sessile
or on peduncle
of less than 1⁄4 inch
(6 mm); cup with pale pubescent
reddish- brown scales, inner surface pubescent,
cup usually bowl shaped, covering up to 1⁄2 of nut; oval,
with faint stripes, 3⁄8 - 5⁄8 inches (10 - 16 mm) long. Size Class:
Bloom InformationBloom Color: Red , Yellow , Green
Bloom Time: Mar , Apr , May
, VA Native Distribution:
SE. Virginia to central Florida, west to E. and central Texas, and north to SE. Oklahoma; to 500 (152 m). Native Habitat:
Well-drained sandy soils of barrens and ridges. Shaded woods.
Growing ConditionsWater Use: Low
Light Requirement: Part Shade
Soil Moisture: Dry
Soil Description: Sandy
BenefitUse Ornamental: Attractive landscape plant.
Use Wildlife: Bluejack oak acorns provide food for birds, squirrels, raccoons, and deer.
Interesting Foliage: yes
Record Last Modified: 2011-09-26
Research By: TWC Staff