Bidens

Japanese: Bidens
Bidens

…An annual plant of the Asteraceae family found in the warm to tropical regions of the Old World, and in Japan in the Kanto region and west, growing in slightly moist grasslands and ditch edges. The stem is erect, 30-150cm tall, and slightly square, with fine hairs along with the leaves. The upper leaves are alternate, while the lower leaves are opposite. Both leaves have stalks. The leaves are once- or twice-pinnately compound, with the terminal leaflet ovate with a sharp tip and fine serrated edges. From September to November, yellow flower heads grow at the ends of many branched twigs. The flower heads consist of tubular and ray flowers. There are 0-5 ray flowers per flower head, but they do not bear fruit. …

*Some of the terminology that mentions "Bidens" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…旧世界の暖帯~熱帯に分布し,日本では関東以西のやや湿った草原や溝べりなどに生えるキク科の一年草。茎は直立し,高さ30~150cm,やや四角で,葉とともに微毛がある。上葉は互生し,下葉は対生する。ともに葉には柄がある。葉は1~2回の羽状複葉で,頂小葉は卵形で先が鋭くとがり,縁に細かな鋸歯がある。9~11月,数多く分枝した小枝の先に黄色の頭花をつける。頭花は筒状花と舌状花とからなる。舌状花は1頭花に0~5個あるが結実しない。…

※「Bidens」について言及している用語解説の一部を掲載しています。

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

<<:  Bidens frondosa (English spelling)

>>:  Bidder's organ

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