Areole

Japanese: areole
Areole

...A great many species have differentiated.
[form]
The cactaceae family is characterized by the presence of special organs called areoles from which thorns grow. The areoles are modified stubs, which are extremely shortened branches that are buried inside the body, and the thorns can be considered modified leaves of these stubs.

*Some terminology explanations that mention "areole" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…たいへん多くの種が分化している。
[形態]
 サボテン科の特徴は,とげの生じる特別な器官である刺座(しざ)areoleを有する点である。刺座は枝が極端に短縮し,かつ体内に埋もれた植物学上短枝と呼ばれる器官の変形で,とげはその短枝の葉の変形といえる。…

※「areole」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

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