An annual plant of the Asteraceae family found from eastern Asia to Australia (illustration). It grows in the shade of gardens and on roadsides. The stems are well branched, crawling along the ground and sending out roots in places. Even the largest main stems are only about 20 cm long. The leaves are wedge-shaped, 1-2 cm long and alternate. Flowers appear from July to October as small flower heads 3-4 mm in diameter in the leaf axils. The flower heads are sessile or short-stalked, oblate-globular, with multiple rows of tubular female flowers at the edges and a tubular bisexual flower in the center. The corolla of the female flower is 0.2 mm long, while the corolla of the bisexual flower is 0.5 mm long and has four lobes at the tip. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
アジアの東部からオーストラリアにかけて分布するキク科の一年草(イラスト)。庭の日陰や道ばたなどに生える。茎はよく分枝して地をはい,ところどころから根を出す。主茎は大きいものでも20cmくらいである。葉はくさび形で長さ1~2cm,互生する。花は7~10月,葉腋(ようえき)につく直径3~4mmの小さな頭花。頭花は無柄または短柄で,扁球形,縁には筒状の雌花が多列に並び,中央には筒状の両性花がある。雌花の花冠は長さ0.2mm,両性花の花冠は長さ0.5mmで,先が4裂する。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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