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''Quercus arizonica'', the Arizona white oak, is North American species of trees in the beech family. It is found in Arizona, New Mexico, western Texas, Sonora, Chihuahua, Coahuila, Sinaloa, and Durango.〔(Biota of North America Program 2014 county distribution map )〕〔(SEINet, Southwestern Biodiversity, Arizona chapter )〕〔Little. ''Atlas of United States Trees, Volume 3, Minor Western Hardwoods'', Little, Elbert L, 1976, US Government Printing Office. Library of Congress No. 79-653298. Map 131, ''Quercus arizonica''.〕 == Description == The Arizona white oak is one of the largest southwestern oaks. It is a perennial tree and may grow up to 60 ft (18 meters) with a trunk diameter of 3.3 ft (1 meter). It also contains fat branches and a spreading crown along with thick leaves. The thick leaves are about 3.2 inches (13 mm) long and evergreen. It grows very slowly once it has become mature, approximately 0.1 inches per year in diameter.〔 * Bark: The color is light grayish. The bark is initially thin and lenticeled but later the bark becomes quite thick with shallow fissures and scaly ridges.〔 * Twig: Are medium sized. Colors can be light brown, fuzzy; reddish brown. Twigs also have pointy and fat clusters of terminal buds.〔 * Leaves: They are alternate, evergreen, simple, and oblong. The color is yellowish green or blueish green. Leaves are usually 1 to 3 inches long and they are usually entire or toothed margin. The texture of the leaves are leathery and stiff. The veins are parallel veins that are sunken above and raised beneath. The leaves also have round shaped base. The leaves may begin to shed in late winter or when new leaves begin emerging during spring.〔 * Fruits: Oblong acorn that is 1/2 to 1 inch long. Acorns also caps that is shaped like a bowl that takes up 1/3 of the nut. The acorns usually mature around fall. The amount of acorns produced can also vary year to year, one year there may be about 32,000 acorns and the next year there may be very few. The germination of acorns is highly correlated with the amount of moisture during the rainy season.〔 * Flowers: They are monoecious, meaning that male and female organs are in different flowers on the same tree. Female flowers have small spike in the axils of the leaves. Males flowers are found in long drooping catkins that are yellowish green color.〔(Flora of North America, ''Quercus arizonica'' Sargent, 1895. Arizona oak )〕〔(Sargent, Charles Sprague 1895. Garden & Forest 8: 92-93 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quercus arizonica」の詳細全文を読む スポンサード リンク
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