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''Rhamnus betulaefolia'', the birchleaf buckthorn, is a shrub or small tree of the Rhamnaceae family, the buckthorns. It is native in northern Mexico in the Sierra Madre Occidental cordillera, and mountainous, desert regions of the Southwestern United States of Arizona, Utah, New Mexico, and far west Texas; besides being found in Sonora, Chihuahua and Durango of the Occidental cordillera, a large species locale occurs to the east in Nuevo León.〔Little. ''Atlas of United States Trees, Volume 3, Minor Western Hardwoods'', Map 149, ''Rhamnus betulaefolia''.〕 ''Rhamnus betulaefolia'' has large ovate leaves, and can grow to be a small tree from 3-10m tall. Blooms in spring, May–June, followed by black-purple fruits in fall. The inner bark was chewed by Native Americans for medicinal purposes.〔(Common and Traditionally Used Plants, NAU )〕 ==Range== The core range of the birchleaf buckthorn is the northern Sierra Madre Occidental cordillera, from central Durango, north to west-southwest Chihuahua, and eastern Sonora; it also ranges just north at the Arizona-New Mexico, Sonora-Chihuahua borders,〔Little. Map 149, ''Rhamnus betulaefolia''.〕 a region called the Madrean Sky Islands, of sky island mountain ranges. Other medium-sized range locales occur at: central, southwest New Mexico, (an extension east from the Mogollon Rim–White Mountains of the Arizona transition zone); the Grand Canyon of the Colorado River with the range extending upriver into the Canyon Lands of southeast Utah; western Texas; and southern Nuevo León. Other states with more minor-sized locales are Nevada, Coahuila, and Tamaulipas.〔Little. Map 149, ''Rhamnus betulaefolia''.〕 File:Rhamnus betulifolia var obovata 3.jpg|Leaf w/Flowers File:Rhamnus betulifolia var obovata 4.jpg|Leaf bottom File:Rhamnus betulifolia var obovata 2.jpg|Close-up, Flower cluster File:Rhamnus betulifolia var obovata 5.jpg|Buds, flowers, leaves 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「Rhamnus betulaefolia」の詳細全文を読む スポンサード リンク
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