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わが国の本州、関東地方から中部地方に分布しています。「ななかまど」の変種です。山地から亜高山帯に生え、高さは6〜10メートルになります。若木の樹皮は淡褐色で楕円形の皮目があり、成木になると暗灰色で浅く裂けます。葉は奇数羽状複葉で、小葉は4〜7対あり披針形から長楕円形、先端は鋭く尖ります。葉の裏面に赤褐色の軟毛が密生し、錆色になります。5月から7月ごろ、枝先に複散房花序をだし白色の花を咲かせます。果実はナシ状果で、秋に赤く熟します。
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バラ科ナナカマド属の落葉高木で、学名は Sorbus commixta var. rufo-ferruginea。英名はありません。
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"Sabiba-nana-kamado" (Sorbus commixta var. rufo-ferruginea) belongs to Rosaceae (the Rose family). It is a tall decidous tree that is distributed to Kanto district and Chubu district of Honshu in Japan. It is a variety of "Nana-kamado". This tree grows in mountains and subalpines and can reach 6-10 m in height. The young barks are pale brown with elliptic lenticles, and turn dark gray and shallow-furrowed when mature. The leaves are odd-pinnately compound with 4-7 pairs of leaflets. They are lanceolate to oblong with acute tips. The abaxial side of leaves are covered with rusy red-brown soft hairs. The compound corymbs are borne on the terminal branches and produce white flowers from may to July. The fruits are pomes and ripen red in fall.
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長野県軽井沢町「軽井沢町植物園」にて、2008年10月18日撮影。
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