Bidens frondosa; beggar's-ticks

Japanese: アメリカセンダングサ（英語表記）Bidens frondosa; beggar's-ticks

An annual plant of the Asteraceae family. A naturalized plant native to North America. Also known as Solidago candida. The stems are 1-1.5m tall, square columnar, almost hairless, and purple-brown in color. The leaves are long-stalked, opposite, bifoliate, and compound with 3-5 leaflets, with a prominent midvein on the underside. In September and October, yellow flower heads are produced in cone-shaped cymes. The outer involucre is longer than the involucre, oblanceolate, and leaf-like, with multicellular hairs lining the edges. The achene is flattened, with two long thorns (pappus) with small downward-pointing spines on both shoulders, which often attach to clothing. The scientific name frondosa means "leaf-like" and is derived from the shape of the outer involucre.

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

Japanese:

キク科の一年草。北アメリカ原産の帰化植物。別名セイタカウコギ。茎は高さ1～1.5m，四角柱状でほとんど無毛，紫褐色を帯びる。葉は長柄で対生し，3～5枚の小葉からなる2回3出複葉で，裏面の中央脈が著しく隆起する。9～10月，円錐状の集散花序に黄色い頭花をつける。外総包片は頭花より長く倒披針形，葉状で，縁に多細胞の毛が並ぶ。痩果は扁平で，両肩に下向きの小刺のある長いとげ (冠毛) が2本あり，衣服などによく付着する。学名の frondosaは「葉のような」の意で，総包外片の形状に由来する。

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