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''Yucca'' × ''schottii'' is a plant species in the genus ''Yucca'', native to southern Arizona, southwestern New Mexico, and the northern parts of Sonora and Chihuahua.. The common names are Schott's yucca, hoary yucca, and mountain yucca. The "×" in the name indicates that this is a nothospecies, regarded as being a natural hybrid between two other species. In this case, ''Yucca'' × ''schottii'' is believed to have originated as a hybrid between ''Y. baccata'' and ''Y. madrensis''. ''Yucca'' × ''schottii'' is firmly established and does reproduce freely in the wild.〔CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, México D.F..〕 ''Yucca'' × ''schottii'' is called mountain yucca because it is found at higher elevations than other tree-like yuccas. It occurs in the mountain ranges at the north of the Sierra Madre Occidental cordillera. It is found in extreme southeast Arizona, then the smaller bootheel region of southwest New Mexico, and the neighboring northern Mexico states of Sonora and extreme northwest Chihuahua.〔Little. ''Atlas of United States Trees, Volume 3, Minor Western Hardwoods'', Map 208, ''Yucca schottii''.〕 Most of its range, about half is in Arizona.〔Little. ''Atlas of United States Trees'', Map 208, ''Yucca schottii''.〕 The mountainous regions of Arizona are in the northeast Sonora Desert, as well as Sonora; the region of New Mexico–Chihuahua lies on the extreme northwest border of the Chihuahuan Desert. This specific region at the intersection of these two deserts, is a Basin and Range area, with sky islands, named the Madrean Sky Islands for the Madrean pine forests of the Sierra Madre Occidental.〔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 208, ''Yucca schottii''.〕 ''Yucca'' × ''schottii'' is a tall species up to 5 m in height, with thin trunks rarrely more than 30 cm across, branching occasionally well above ground. Leaves are lanceolate, broad and tapering at both ends, stiff and rigid, up to 60 cm long and up to 8 cm wide, with a hard spine formingthe tip. Flowers are white. Fruit is fleshy and egg-shaped.〔(Engelmann, Georg. 1873. Transactions of the Academy of Science of St. Louis 3: 46 )〕〔Shreve, F. & I. L. Wiggins. 1964. Vegetation and Flora of the Sonoran Desert 2 vols. Stanford University Press, Stanford. 〕〔McKelvey, Susan. 1938. Yuccas of the Southwestern United States. Jamaica Plain: Arnold Arboretum.〕 File:Yucca schottii 20070226-1535-58.JPG|Mountain Yucca (Schott's Yucca) == References == 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「Yucca × schottii」の詳細全文を読む スポンサード リンク
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