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''Ribes hirtellum'' is a North American species of gooseberry known by the common names American gooseberry, hairy-stem gooseberry,〔 hairy gooseberry,〔 and wedge-leaf gooseberry,〔 native to Canada and to the northeastern and north-central United States.〔(Biota of North America Program 2014 state-level distribution map )〕 Cultivated gooseberries are derived from this species and from ''Ribes uva-crispa''.〔 ==Use in gooseberry breeding== Whereas ''R. uva-crispa'' crops have been devastated by American gooseberry mildew, ''Podosphaera mors-uvae'' (syn: ''Sphaerotheca mors-uvae''), which was accidentally introduced to Europe, ''R. hirtellum'' is resistant. It is one of four American species that have been interbred with ''R. uva-crispa'' to produce resistant cultivars similar to the original ''R. uva-crispa'' cultivars. Cultivar 'Houghton' is one of those obtained by crossing ''R. uva-crispa'' with ''R. hirtellum''.〔 File:Ribes hirtellum 3.jpg|Leaf File:Ribes hirtellum 1.jpg|Flower File:Ribes hirtellum - Botanical Garden in Kaisaniemi, Helsinki - DSC03482.JPG|Autumn foliage 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「Ribes hirtellum」の詳細全文を読む スポンサード リンク
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