A perennial plant of the Asteraceae family. The stems are thin, erect, 0.5-1 meter tall, and slightly branched upwards. The leaves are comb-like, with either deep or middle lobes, and sharp serrations on the edges. The name comes from the saw-like shape of the leaves. There are no petioles, and the leaves have rather large lobes at the base that embrace the stem. From July to September, the plant produces somewhat dense corymbs at the top of the stem. The flower heads consist of 5-7 white ray florets and tubular flowers. The achene is flat, 3 mm long, and has no hairs or pappus. It grows in mountain grasslands, and is distributed from Honshu, Hokkaido, and northern East Asia to the temperate zone of North America. It has been cultivated for ornamental purposes since ancient times. It is also used medicinally, as a stomach tonic and to treat hemorrhoids. The genus name Achillea comes from the legend that the Greek hero Achilles discovered the medicinal properties of this species. A closely related species, Achillea millefolium L., is a horticultural plant native to Europe with leaves that are deeply pinnate and bifurcate. In recent years, it has come to be known by its genus name, Achillea, and is widely cultivated. [Hiroyuki Koyama] The leaves are comb-toothed, with either deep or middle lobes and sharp sawtooth edges. From July to September, the plant produces a somewhat dense corymb at the top of the stem. ©Shogakukan Photo by Masatoshi Hirose "> Yarrow In summer, it produces many white flower heads in panicles. It is often planted in flower beds and is also used as an herb. © Kyoko Nagumo "> Yarrow Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
キク科の多年草。茎は細く、直立して高さ0.5~1メートル、上方ですこし枝分れする。葉は櫛(くし)の歯状に中裂または深裂し、縁(へり)に鋭い鋸歯(きょし)がある。名は、この葉形を鋸(のこぎり)に見立てたもの。葉柄はなく、葉の基部にやや大形の裂片があって茎を抱く。7~9月、茎頂に、やや密集した散房状花序をつける。頭花は白色の舌状花5~7個と管状花からなる。痩果(そうか)は扁平(へんぺい)で長さ3ミリメートル、毛、冠毛ともにない。山地の草地に生え、本州、北海道、および東アジア北部から北アメリカの温帯に分布する。古くから観賞用として栽培される。健胃強壮剤、痔(じ)病の治療など、薬用としても用いる。属名Achilleaは、ギリシアの英雄アキレウスが本種の薬効を発見したという伝説に基づく。 近縁種セイヨウノコギリソウA. millefolium L.はヨーロッパ原産の園芸植物で、葉は2~3回羽状に深く全裂する。近年、属名のアキレアの名でよばれ、広く栽培される。 [小山博滋] 葉は櫛の歯状に中裂または深裂し、縁に鋭い鋸歯がある。7~9月、茎頂にやや密集した散房状花序をつける©Shogakukan 撮影/広瀬雅敏"> ノコギリソウ 夏、白色の頭花を散房状に多数つける。花壇などによく植えられ、ハーブとしても利用される©南雲今日子"> セイヨウノコギリソウ 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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