Vernonia

...A perennial plant of the Asteraceae family native to tropical Asia. In Japan, it is found in the Ryukyu Islands and southern Kyushu. It is often a weed in cultivated land. The stem is erect and 40-150 cm long. The leaf shape is highly variable, with the leaf blades ranging from diamond-oval to oval or oblong. It flowers from October to November. The upper part of the stem branches, and many small flower heads are borne in corymbs. The flower heads are 7-8 cm long and all consist of bisexual tubular flowers. The involucre is bell-shaped and 4-5 mm long. Each flower head contains around 20 florets. The corolla is purple-red. It is 5-6 mm long. ...

*Some of the terminology that mentions "Vernonia" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…熱帯アジア原産のキク科の多年草。日本では琉球や九州南部で見られる。しばし耕地雑草となる。茎は直立し，40～150cm。葉形の変異性が高く，葉身は菱卵形から卵形または長楕円形などとなる。花期は10～11月ころ。茎上部が分枝し，多数の小さい頭花を散房状の円錐花序につける。頭花は長さ7～8cm，すべて両性の筒状花からなる。総苞は鐘形で，長さ4～5mm。1頭花あたりの小花は20個内外。花冠は紫紅色。長さ5～6mm。…

※「Vernonia」について言及している用語解説の一部を掲載しています。

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