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Trifoliate orange (''Poncirus trifoliata'', synonym ''Citrus trifoliata''), is a member of the family Rutaceae, closely related to ''Citrus'', and sometimes included in that genus, being sufficiently closely related to allow it to be used as a rootstock for ''Citrus'' and to readily hybridize with all ''Citrus'' species. It differs from ''Citrus'' in having deciduous, compound leaves, and pubescent (downy) fruit. It is native to northern China and Korea, and is also known as the Chinese Bitter Orange or Hardy Orange.〔(【引用サイトリンク】title=Plant of the Week. Hardy Orange or Trifoliate Orange. Latin: Poncirus trifoliat )〕 The plant is a fairly cold-hardy citrus (USDA zone 6) and will tolerate moderate frost and snow, making a large shrub or small tree 4–8 m tall. Because of the relative hardiness of ''Poncirus'', citrus grafted onto it are usually hardier than when grown on their own roots. ==Description== ''Poncirus trifoliata'' is recognizable by the large thorns on the shoots, and its deciduous leaves with three (or rarely, five) leaflets, typically with the middle leaflet long, and the two side leaflets long. The flowers are white, with pink stamens, in diameter, larger than those of true citrus but otherwise closely resembling them, except that the scent is much less pronounced than with true citrus. As with true citrus, the leaves give off a spicy smell when crushed. The fruits are green, ripening to yellow, and in diameter, resembling a small orange, but with a finely downy surface. 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「Trifoliate orange」の詳細全文を読む スポンサード リンク
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