Erigeron sumatrensis (English name)

Japanese: オオアレチノギク（英語表記）Erigeron sumatrensis

A biennial plant of the Asteraceae family. A naturalized plant native to South America. It grows on sunny plains, grasslands, and roadsides, and is gray-green in color. The stem is 60-150cm tall, covered with coarse or short hairs, and branches in large numbers in the upper half. The basal leaves overwinter in a rosette shape, and die when the plant flowers. The stem leaves are oblanceolate, 6-10cm long, and densely covered with short hairs. From August to October, it produces numerous cone-shaped flower heads, each about 5mm long. The involucre is hairy, the ray florets are dirty white and shorter than the tube, and the pappus is light brown. The achenes fall off and germinate and reproduce easily. It appears to have been introduced to Japan around 1920, and its numbers have increased especially since 1945.

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

Japanese:

キク科の二年草。南アメリカ原産の帰化植物。日当りのよい平地，草原や路傍に生え，全草灰緑色。茎は高さ 60～150cm，粗毛や短毛が生え，上半部では多数分枝する。根出葉はロゼット状で越冬し，花時には枯れる。茎葉は倒披針形，長さ6～10cmで短毛が密生する。8～10月，長さ約 5mmの頭花を円錐状に多数つける。総包は有毛，舌状花は汚白色で筒部より短く，冠毛は淡褐色。痩果は落ちて容易に発芽，繁殖する。日本には 1920年頃渡来したらしく，45年以降特にふえた。

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