Genus Iwarengezoku

...They have succulent leaves, but lack stipules, and have small scales (nectar glands) between the petals and carpels. The Sedum subfamily is widely distributed in the Northern Hemisphere, with flowers that are mostly pentamerous, with 10 stamens, and are represented by the Sedum genus and Orostachys genus, which have prominent rosette leaves. The Crassulaceae subfamily is concentrated in South Africa, with only the Tillaea genus distributed in the Northern Hemisphere and Australia.

*Some of the terminology that refers to the "Azolla genus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…多肉葉を発達させるが，托葉を欠き，花弁と心皮の間に小さな鱗片(みつ腺)がある。セダム亜科は北半球に広く分布し，花はおもに5数性で，離弁，おしべは10本，代表属はマンネングサ(セダム)属Sedumや，ロゼット葉が顕著なイワレンゲ属Orostachys。クラッスラ亜科は南アフリカに集中し，アズマツメクサ属Tillaeaのみが，北半球やオーストラリアに分布する。…

※「イワレンゲ属」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