Species of oak tree
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Quercus hypoleucoides, the silverleaf oak or the whiteleaf oak, is a North American species of oak tree or shrub. It grows in the southwestern United States and northern Mexico.
Description.
"Quercus hypoleucoides", though usually seen as a shrub, can be found to be a full-sized tree, 9 metres (30 feet) tall in areas where it receives sufficient water.
The tree produces its flowers in the spring as most plants do. It grows in warm regions and is used as an ornamental due to its unusual foliage.
"Q. hypoleucoides" can be distinguished from other oaks by its lanceolate leaves which are dark green on top but silver white on the lower surface.
Taxonomy.
Its species name, "hypoleucoides", means "white underneath", referring to the leaves. It has been referred to as "Quercus hypoleuca" , an illegitimate name, and as "Quercus confertifolia" , not to be confused with "Quercus confertifolia" 
Distribution and habitat.
The species is commonly found in moist canyons and on ridges. It also is found in coniferous forests and high elevated lands from 1,500–2,400 m (5,000 to 8,000 ft) above sea level. Mountains of southern Arizona and New Mexico such as the Santa Catalina Mountains and the Chiricahua Mountains, for example, have a pine-oak woodland at an elevation of roughly 1,710–2,160 m (5,700 to 7,200 ft). Here, "Q. hypoleucoides" can be found as well as other species of oak trees such as the "Q. arizonica", "Q. emoryi", and "Q. rugosa".
Specimens have also been collected south of the international frontier, in Sonora, Chihuahua, Coahuila, and Sinaloa.
Ecology.
This species has acorns which are eaten by both squirrels and birds. The taller trees also help to provide shade for animals below who need to get away from the strong rays of the sun.
It is a vigorous post-fire resprouter and will form a multi-stem shrub in areas of repeated fire.
Uses.
The acorns can be eaten after leaching out the toxic tannic acid.
The tree has been used for ornamental purposes. Its leaves have a unique contrast due to the very white, silver color of the bottom.
References.
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