glochid

…The subfamily Opuntia consists of 7 genera and 450 species. The stems are not only prickly but also rod-shaped and spherical, but usually have no ridges. In the early stages of growth, they have small fleshy leaves, and in addition to the usual thorns, they have glochids that fall off when touched. The representative genus Cactus contains 400 species and is distributed in the high mountains of Canada and the Andes. …

*Some of the terminology explanations that mention "glochid" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ウチワサボテン亜科は7属450種からなり，茎はウチワ型以外に棒状や球型もあるが，通常，稜はない。生長の初期には小さな肉質の葉があり，通常のとげ以外にさわると抜ける芒刺（ぼうし）glochidをもつ。代表的なウチワサボテン属Cactusは400種を含み，カナダやアンデスの高山にも分布する。…

※「glochid」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