Butana (English name) Hypochoeris radicata L.

Japanese: ブタナ（英語表記）Hypochoeris radicata L.

A perennial plant of the Asteraceae family that grows on pastures and urban wastelands (illustration). It is an introduced plant native to Europe, and its introduction into Japan was noticed in the early 1930s. It is particularly common in Hokkaido. Its English names are cat's-ear, gosmore, and California dandelion. The pinnate leaves grow at the base and form a rosette, which exudes a white milky liquid when cut. In spring, it produces a flower stalk about 50 cm long and produces bright yellow flower heads. The flower heads consist of only ray flowers and are 3 to 4 cm in diameter. At first glance, it resembles the dandelion genus, but it differs in that the leaves are densely covered with yellowish-brown stiff hairs and the flower stalks are branched and have black scales.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

牧場や都市の荒地にはえるキク科の多年草（イラスト）。ヨーロッパ原産の帰化植物で，日本への侵入は1930年代初期に気づかれた。とくに北海道に多い。英名はcat’s‐ear,gosmore,California dandelion。羽裂する葉が根生してロゼットをなし，切ると白色の乳液が出る。春に長さ50cmほどの花茎を上げ，鮮黄色の頭花をつける。頭花は舌状花のみからなり，径3～4cm。一見，タンポポ属に似るが，葉には黄褐色の硬い毛が密生し，花茎は分枝して黒色の鱗片がつく点が異なる。

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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