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わが国の本州、秩父山地西部から八ヶ岳南部、南アルプス北西部にかけて点在して分布しています。山地の沢沿いに生え、高さは２５メートルほどになります。樹冠は円錐形になります。樹皮は灰褐色で、薄く剥離します。葉は線形で、長さ６～１２ミリ、断面は菱形です。葉枕がよく発達します。雌雄同株で、６月ごろに花を咲かせます。果実は円柱形の球果で、１０月ごろに熟し、光沢のある褐色になります。種小名は、１９１１年に八ヶ岳において発見した小山光男技師に因みます。環境省レッドリストでは、絶滅危惧ⅠB類 (EN)に分類されています。
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マツ科トウヒ属の常緑高木で、学名は Picea koyamae。英名は Koyama's spruce。
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The Koyama's spruce (Picea koyamae) belongs to Pinaceae (the Pine family). It is a tall evergreen tree that is scattered and distributed from the western part of the Chichibu Mountains to the southern part of the Yatsugatake Mountains and the northwestern part of the Southern Alps in Honshu, Japan. It grows along streams in mountainous areas and grows to a height of about 25 m. The crown is conical. The bark is grayish brown and peels thinly. The leaves are linear, 6 to 12 mm long, and diamond-shaped in cross section. The pulvinae are well developed. It is monoecious and flowers around June. The fruit is a cylindrical cone that ripens around October and is a shiny brown color. The specific epithet is named after Mitsuo Koyama, the engineer who discovered it in Yatsugatake in 1911. It is classified as Endangered (EN) on the Red List of Japan's Ministry of the Environment.
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茨城県つくば市「つくば実験植物園」にて、2025年01月25日撮影。
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やつがたけとうひ (八ヶ岳唐檜)
shu@botanic.jp