Japanese name: カテンソウ（花点草） Scientific name:Nanocnide japonica
[Overview]
A perennial 10–30 cm tall that forms colonies in forests in the mountains.
The stem is square in cross section and has upward-pointing hairs.
Leaves are simple and alternate, fan-shaped to triangular-ovate, 1–3 cm both long and wide.
The leaf margin has 4–8 pairs of deep, rounded teeth.
The petiole is as long as the leaf or longer.
At the base of the petiole are ovate stipules 1–2 mm long.
There are male and female flowers, both borne in the leaf axils in the upper part of the stem.
The male inflorescence has a stalk longer than the leaves and branches several times.
The male flowers have 5 tepals and 5 stamens.
The female inflorescence is stalkless or has only a very short stalk.
The female flowers have 4 tepals.
The fruit is an achene.
