Plant - summer
Highlands Center for Natural History
Sue Smith
Yavapai County Native & Naturalized Plants
   
 
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Plant Image
Plant - summer
Prescott area
Jeff Schalau
Plant Image
Leaves
Lynx Creek - above Lynx Lake
Sue Smith
Plant Image
Leaves
Pioneer Park
Sue Smith
Plant Image
Acorn
Seven mile Gulch - Tr 354
Sue Smith
Plant Image
Bark
Prescott area
Jeff Schalau
Plant Description

Origin: Native
General Description: Spring-deciduous. Upright form with a short trunk and a spreading, irregular rounded crown of stout, twisted branches. Slow growth. Largest southwestern oak. New leaves emerge when old leaves drop in May. Found on dry rocky slopes of Arizona and New Mexico.
Identification notes: Pale green leaves, may have marginal spines, otherwise smooth leaf margins; bark is whitish on mature specimens (hence the name); shrub or a tree, reaching a height of 40 feet or more; often have a spreading/rounded growth form; drought deciduous.
Height: 60 feet     Width: 30 feet


Habitat

Plant Communities: Interior Chaparral, Pinyon Juniper Woodland, Montane Conifer Forest, Riparian
Elevation: 5000 - 7500 feet


Flowers

Color: Yellow-green   Shape: Inconspicuous in elongated clusters     Tubular: N   Flowering Period: Apr - May
Description: Monoecious. Tiny. Males in long drooping catkins, yellow-green. Females have very small short spikes in leaf axils, appearing with the leaves.


Leaves

Leaf Color: Blue-green   Type: Simple   Shape: Round or oval   Margin: Toothed   Attachment: Alternate   Hairs: Bottom of leaves
Description: Oval and oblong 1 1/2 to 3 1/2 inches long. Thick and stiff with slightly wavy margins. Toothed toward apex. Upper is a dull blue-green with sunken veins. Undersurface has a lighter color with short, dense, fuzzy brown hairs and raised veins.


Fruit

Color: Light-brown   Type: Acorn or acorn-like   Description: Oblong acorn 1/2 to 1 inch long with lower third to half partly covered by hairy and scaled bowl-like cup. Ripens in one season in early fall.


Bark/Branches

Bark Color: Gray   Bark Texture (Mature): Rough   Bark and Branch Description: Light gray, initially thin and lenticeled, becomes quite thick with scaly ridges. Fissured into thick plates. Twigs are light brown and fuzzy. Trunk up to 3 feet in diameter.
Spines, thorns or prickles: Y

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 7.0  
http://cals.arizona.edu/yavapaiplants/SpeciesDetail.php  
Last Updated: May 10, 2017  
Content Questions/Comments: Email Jeff Schalau  
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