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Vitis rupestris
''Vitis rupestris'' is a species of grape native to the United States that is known by many common names including July, sand, sugar, beach, bush, currant, ingar, rock, and mountain grape. It is used for breeding several French-American hybrids as well as many root stocks. The cultivar known as Rupestris St. George has been widely used in breeding and as a root stock; it is perhaps the best known.
''Vitis rupestris'' is a self-supporting bushy plant that does not grow in the shade, and is found only on rocky riverbanks and streambanks. Much of its habitat has been destroyed due to damming of rivers and destruction of islands for navigation. ''Vitis rupestris'' has been listed as threatened or endangered by Indiana, Kentucky, Pennsylvania, and Tennessee. Known locations of wild ''Vitis rupestris'' are quickly disappearing, which may threaten the future of this grape species.
== Distribution and ecology ==
The natural distribution of ''Vitis rupestris'' is concentrated in the Ozark Hills of Missouri and Arkansas. The species is less common in scattered populations east as far as Pennsylvania and southwest into Oklahoma and Texas. There are a few reports of the species occurring in the San Francisco Bay area of California, but these are most likely escapes from cultivation.〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Vitis rupestris'' Scheele sand grape )〕〔(Munson, T.V. 1909. Foundations of American Grape Culture. New York: Orange Judd Company. )〕
It is found hybridized in parts of its range with the Riverbank grape and other Vitis species.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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