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わが国の本州から四国、九州それに朝鮮半島や中国に分布しています。「あけび」と「みつばあけび」の種間交雑種で、ともに生える地域に限られます。この２つの母種の中間的な形態が現れています。葉は掌状複葉で小葉は５個、ときに３個です。４月から５月ごろ、暗紫色の花を咲かせます。果実は１０月に熟します。
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アケビ科アケビ属の落葉蔓性木本で、学名は Akebia x pentaphylla。英名はありません。
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"Goyo-akebi" (Akebia x pentaphylla) belongs to the family Lardizabalaceae. It is a deciduous woody vine that is distributed from Honshu to Shikoku, Kyushu in Japan, as well as the Korean Peninsula and China. It is an interspecific hybrid of "Akebi" (Akebia quinata) and "Mitsuba-akebi" (Akebia trifoliata) and is limited to areas where both grow. It appears an intermediate morphology of these two mother species. The leaves are palmately compound leaves with 5 leaflets and sometimes 3 leaflets. The dark purple flowers come in April to May. The fruits ripen in October.
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長野県豊田村穴田にて、2004年05月02日撮影。
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ごようあけび (五葉通草)
shu@botanic.jp