Mazus

...A perennial herb of the Scrophulariaceae family that grows on rice field ridges and in moist grasslands (illustration). The leaves are obovate and gathered at the base of the plant, 2-5 cm long, 1.5-2 cm wide, and have irregularly lobed sawtooth. It reproduces by extending runners to create new seedlings. In April and May, a flower stalk 10-15 cm high grows from between the leaves at the base of the plant, and produces several crimson-purple flowers. The calyx is bell-shaped with five lobes. The corolla is lip-shaped, with a large lower lip with three lobes and a short upper lip with two lobes and a curled-back tip. The capsule is oblate and enclosed in the calyx. ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…田のあぜや湿気のある草地に生えるゴマノハグサ科の多年草（イラスト）。葉は倒卵形で根ぎわに集まり，長さ2～5cm，幅1.5～2cm，ふぞろいに裂けた鋸歯がある。走出枝を伸ばして新苗を作って繁殖する。4～5月，根ぎわの葉の間から高さ10～15cmの花茎を伸ばし，紅紫色の花を数個つける。萼は鐘形で5裂。花冠は唇形で，下唇は大きくて3裂し，上唇は短く，2裂して先は反り返る。蒴果（さくか）は扁球形で萼に包まれる。…

※「Mazus」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