Quercus × alvordiana

Quercus × alvordiana, the Alvord oak, is a hybrid oak in the genus Quercus. It has been reported to be a hybrid between Quercus douglasii and Quercus turbinella,[1] or between Q. douglasii and Quercus john-tuckeri,[2][3] which was formerly considered to be a variety of Q. turbinella.[4]

Quercus × alvordiana
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Rosids
Order:
Fagales
Family:
Fagaceae
Genus:
Quercus
Species:
Q. × alvordiana
Binomial name
Quercus × alvordiana
Synonyms

Quercus dumosa var. alvordiana
Quercus turbinella var. californica

Distribution

This is the most common hybrid of Q. douglasii. It is endemic to California, where it occurs in the Southern Inner California Coast Ranges and western Transverse Ranges.[5]

Description

'Quercus × alvordiana is a shrub or tree under 3 metres (9.8 ft) tall which may be evergreen or deciduous.

The leaves are up to 5 centimeters long, a dull blue to gray-green on top and paler green on the undersides. The leaf blades have toothed edges and some have pointed tips.

The acorn is narrow in shape and up to 4 centimeters long, with a cup up to 1.6 centimeters wide.[3]

Notes
  1. Quercus × alvordiana. U.S. Department of Agriculture. PLANTS.
  2. Fryer, J. L. 2007. Quercus douglasii. In: Fire Effects Information System. USDA FS, Rocky Mountain Research Station, Fire Sciences Laboratory.
  3. Quercus × alvordiana. The Jepson Flora Project, Jepson eFlora. 2012.
  4. Quercus douglasii. Flora of North America.
  5. Hogan, C. M. 2008. Blue Oak, Quercus douglasii. Archived February 28, 2012, at the Wayback Machine GlobalTwitcher.com, ed. N. Stromberg.


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