Sanguisorba

...A perennial plant of the Rosaceae family (illustration) commonly found in fields and mountains. It has an underground rhizome, and the stem grows to a height of about 1m, with small branches. Both the basal leaves and the leaves on the stem are pinnately compound. The leaflets of the basal leaves are usually in 5 pairs, oblong, elliptical or oval, and 3-5cm long. The spikes are erect, 1-2cm in size, and produce dense dark red flowers from summer to autumn. The flowers have no petals, and the calyx is divided into four parts to form a petal shape. There are four stamens, and the fruit is small and square. The Japanese name for Waremoko is written as 吾木香, 我毛香, 吾又紅, etc., but the origin of the word is not entirely clear, and it does not seem to be related to the red color of the flowers. ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…野原や山地でよく見かけるバラ科の多年草（イラスト）。地下に根茎があり，茎は高さ1mほどになり，小枝を分かつ。根出葉も茎の葉も羽状複葉。根出葉の小葉は，多くは5対内外，長楕円形，楕円形または卵形で，長さ3～5cm。穂状花序は直立して1～2cm，夏から秋にかけて密に暗赤色の花をつける。花には花弁がなく，萼が4裂して花弁状になる。おしべは4本，果実は小さく四角形。ワレモコウの和名には，吾木香，我毛香，吾亦紅などの字が当てられるが，語源は必ずしもはっきりしていなくて，花の紅色とは関係なさそうである。…

※「Sanguisorba」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