Ageratum conyzoides; ageratum

Japanese: カッコウアザミ（英語表記）Ageratum conyzoides; ageratum

An annual plant of the Asteraceae family, native to tropical America. It is a horticultural plant, but has become wild and weedy in warm regions. It grows to about 60 cm tall and is covered with soft hairs. It produces several 4-8 mm blue-purple flower heads similar to thistles. The dwarf species is 15-18 cm tall and is used in flower beds, while the normal species is used for cut flowers. It is often cultivated under the name ageratum along with the closely related species A. houstonianum , which has a large flower head.

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

Japanese:

キク科の一年草で，熱帯アメリカ原産。園芸植物であるが，暖地では野生化して雑草となっている。丈は 60cmぐらいで，全体に軟毛がある。アザミに似た4～8mmの青紫色の頭状花が数個咲く。矮生種は丈が 15～18cmで花壇用，普通種は切り花用。近縁種で頭花の大きいオオカッコウアザミ A. houstonianumとともに，アゲラタムの名でよく栽培される。

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