Japanese name: コシロネ（小白根） Scientific name:Lycopus cavaleriei
[Overview]
A perennial 10–60 cm tall, growing in wetlands and along the edges of ponds and marshes.
It has creeping underground stems.
The stem branches from the base and stands erect; it is square in cross section, with white hairs only at the nodes.
Slender stolons extend from the base of the stem.
Leaves are simple and opposite, rhombic-narrowly ovate, 3–6 cm long and 1–2.5 cm wide.
The upper surface of the leaf is not glossy, and the margin has teeth.
White lipped flowers about 3 mm long are borne densely in the leaf axils.
The calyx is divided about halfway into 5 lobes with pointed tips.
The fruit is a schizocarp.
