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わが国の固有種で、九州北部の久住山塊や祖母山に分布しています。冷温帯の草原に生え、高さは５０〜１００センチになります。葉は羽状に深裂し、花期にも根生葉が残るのが特徴です。９月から１１月ごろ、茎頂に紫色の頭花をやや下向きに咲かせます。総苞にはクモの巣状の毛があり、粘り気があります。
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キク科アザミ属の多年草で、学名は Cirsium kujuense。英名はありません。
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The "Kuju-azami" (Cirsium kujuense) belongs to Asteraceae (the Aster family). It is a perennial herb that is endemic to Japan and is found in the Kuju Mountain Range and Mt. Sobosan in northern Kyushu. It grows in cool-temperate grasslands and reaches a height of 50 to 100 cm. Its leaves are deeply pinnately lobed, and a distinctive feature is that the basal leaves remain even during the flowering period. From September to November, it produces purple capitula that bloom slightly downward at the stem tips. The involucre is covered with cobweb-like hairs and has a sticky texture.
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大分県別府市南立石「鶴見岳」にて、2026年05月14日撮影。
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くじゅうあざみ (九重薊)
shu@botanic.jp