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わが国の固有種で、本州の関東地方から中部地方と四国に分布しています。標高の高い山地な生え、高さは5〜12メートルになります。樹皮は暗灰色で平滑です。葉は奇数羽状複葉で、3〜4対の小葉がつきます。小葉は長楕円形で長さ4〜12センチ、先端は鋭く尖り、縁には細鋸歯があります。5月ごろ、新枝の先端に円錐花序をだし、白色の花を咲かせます。花弁は4個で線形です。果実は狭倒披針形の翼果で、9月から10月に熟します。
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モクセイ科トネリコ属の落葉小高木で、学名は Fraxinus apertisquamifera。英名はありません。
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The "Miyama-aodamo" (Fraxinus apertisquamifera) belongs to Oleaceae (the Olive family). It is a semi-tall deciduous tree that is endemic to Japan and is distributed in the Kanto to Chubu regions in Honshu and Shikoku. It grows in high mountains and reaches a height of 5 to 12 m. The bark is dark gray and smooth. It has oddly pinnate compound leaves with three to four pairs of leaflets. The leaflets are oblong, 4 to 12 cm long, with sharply pointed tips and serrulated edges. The four petals are linear. The fruit is a narrowly oblanceolate samara that ripens from September to October.
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[上・中1〜4] 長野県木島平村「北ドブ湿原」にて、2003年07月20日撮影。 [中5〜7・下] 長野県小海町稲子にて、2018年05月18日撮影。
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