Pyrethrum - Chrysanthemum cinerariifolium; pyrethrum

Japanese: ジョチュウギク(除虫菊) - ジョチュウギク(英語表記)Chrysanthemum cinerariifolium; pyrethrum
Pyrethrum - Chrysanthemum cinerariifolium; pyrethrum
A perennial plant of the Asteraceae family. Also known as white daisy. Native to Dalmatia in the Balkans. In Japan, it is widely cultivated around the Seto Inland Sea and Hokkaido. The stems are 30-60cm tall and covered with white silky hairs. The leaves are pinnately lobed 2-3 times, with thin, linear lobes. In May-June, a flower head about 3cm in diameter appears at the end of a long peduncle. There are 15-20 white ray-shaped flowers around the edge, and the center is made of yellow tubular flowers. Dried flowers have insecticidal properties, and the active ingredient is pyrethrin. Powdered flowers were once widely used as insecticides, such as flea powder. They are also currently used as an ingredient in mosquito coils.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
キク科の多年草。一名シロバナムシヨケギク。バルカン半島のダルマチア地方原産。日本では瀬戸内海周辺や北海道で多く栽培される。茎は高さ 30~60cmで全体に白い絹毛におおわれる。葉は2,3回羽状に裂け,裂片は細長い線形。5~6月頃,長い花柄の先に径約 3cmの頭状花をつける。周辺に白色の舌状花が 15~20個並び中央は黄色の管状花から成る。花を乾燥したものには殺虫力があり,有効成分はピレトリンである。粉末にしてかつては蚤取り粉など殺虫剤として広く使用された。また蚊取り線香の原料として現在も使われている。

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