Pellionia

...A perennial plant of the Urticaceae family that grows in the valleys of evergreen broad-leaved forests (illustration). The leaves are lined on both sides of the stem that creeps along the ground surface, and their appearance resembles the compound leaves of the Japanese pepper plant, hence the Japanese name. The stem branches and grows to cover the ground surface, 10-30cm long, with short, spreading hairs that stand out. The leaves are small, 0.4-1.5cm long. The closely related giant salamander P. radicans (Sieb.et Zucc.) Wedd. has larger leaves, 2-4.5cm long, and the hairs on the stem are very short and inconspicuous. ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…照葉樹林帯の谷間に生えるイラクサ科の多年草（イラスト）。葉は地表面をはう茎の両側に並び，そのようすがサンショウの複葉に似ていることから和名がついた。茎は分枝して地表面をおおうように伸び，長さ10～30cm，開出する短毛があってよく目だつ。葉は長さ0.4～1.5cmと小型。近縁のオオサンショウソウP.radicans (Sieb.et Zucc.) Wedd.は葉がより大型で，長さ2～4.5cm，茎の毛はごく短く目だたない。…

※「Pellionia」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