broad-leaved dock

...It is also used for dyeing, dyeing it grayish-white with iron mordant. Rumex conglomeratus Murr. and Rumex obtusifolius L. (English name: broad-leaved dock), which resemble Rumex, are naturalized plants native to Europe and can be found along roadsides and in wastelands. [Kazuzo Tsuchiya]...

*Some of the terminology that mentions "broad-leaved dock" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また染色にも用い，鉄媒染でねずみ色などを染める。　ギシギシに似たアレチギシギシR.conglomeratus Murr.やエゾノギシギシR.obtusifolius L.(英名broad‐leaved dock)は，ヨーロッパ原産の帰化植物で，路傍や荒地に見られる。【土屋 和三】。…

※「broad-leaved dock」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