Persicaria nepalensis ("Tanisoba")

Japanese name: タニソバ （谷蕎麦）
Scientific name: Persicaria nepalensis

[Overview]
An annual 10–50 cm tall, found at forest edges and in sunny fields.
The stem creeps at the base, then rises in the upper part and branches well.
The stem is often tinged with red.
The leaves are simple and alternate, ovate, 1–9 cm long and 0.5–3 cm wide, hairy on the underside, with entire margins.
The petiole has a broad wing that clasps the stem.
Short racemes forming balls 3–8 mm across emerge at the stem tips and leaf axils.
There is no corolla; the conspicuous calyx is white, red or green.
The fruit is an achene.

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