Dahl, A.

...A cold-tolerant perennial plant of the Asteraceae family, this is a typical bulbous flower (illustration) that is widely used for flower beds, cut flowers, and potted plants. It grows to a height of about 30cm to 2m, and has a tuberous root underground (illustration) similar to a sweet potato. It sprouts only where the tuberous root attaches to the stem, and there are no buds on the fleshy enlarged part. The leaves are green, sometimes purple-brown, and arranged in three whorls when opposite, and are pinnately compound with sawtooth edges. The stem is jointed and hollow inside. The flowers are heads of many tubular flowers with ray flowers called petals, stamens, and pistils, just like chrysanthemums, and bloom intermittently from early summer to late autumn at the ends of the main stem and side branches. ...

*Some of the terminology that mentions "Dahl, A." is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…キク科の不耐寒性多年草で，花壇，切花，鉢植えと広範囲に使われる代表的な球根草花（イラスト）。草丈は30cmから2mくらい，地下にサツマイモに似た塊根（イラスト）をもつ。塊根が茎に付着する部分からのみ発芽し，多肉質の肥大部分には芽をもたない。葉は緑色，まれに紫褐色をおび，対生ときに3輪生となり，羽状複葉で葉縁に鋸歯をもつ。茎は有節で内部は空洞。花はキクと同じように花弁と呼ばれる舌状花とおしべ･めしべを備えた管状花が多数集まった頭状花で，主茎と側枝の先に初夏から秋末まで断続的に開花する。…

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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