Fin thistle - Fin thistle

Japanese: ヒレアザミ - ひれあざみ

It is named "Heathistle" because the stem has wings, but unlike Cirsium , the pappus is not feathery (illustration). It is a biennial plant of the Asteraceae family that grows at the foot of mountains, in fields, on river banks and roadsides. The stem is upright, about 1m tall, and has two vertical wings. The wings also have thorns. The leaves are alternate, pinnate, medium to deep lobes and have thorns on the edges. The undersides of the leaves are initially covered with white spider hairs. The flowering season is May to July. Flower heads grow at the ends of the branches. The florets are all the same shape and bisexual. The corolla is reddish purple, or occasionally white.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

茎に翼があるところからヒレアザミと名づけられているが，アザミCirsiumと違って，冠毛は羽毛状ではない（イラスト）。山麓や野原，川の堤防や道端に生えるキク科の越年草。茎は直立して，高さ1m内外，縦に2条の翼をつける。翼にもとげがある。葉は互生し，羽状に中～深裂して縁にはとげがある。葉の裏面は初め白いくも毛でおおわれている。花期は5～7月。枝の先に頭花をつける。小花はすべて同形で両性。花冠は紅紫色，まれに白色。

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

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