Persicaria lapathifolia var. lapathifolia("Oinutade")
Japanese name: オオイヌタデ（大犬蓼） Scientific name:Persicaria lapathifolia var. lapathifolia
[Overview]
An annual seen on vacant land and at the waterside, reaching 1.6 m tall in large specimens.
The stem is erect and the nodes are swollen.
Leaves are simple and alternate, lanceolate to ovate, 4–20 cm long and 0.3–6 cm wide.
The lateral veins leave the midrib at nearly right angles and number 14–37 pairs.
Coarse hairs grow on the veins on the underside of the leaves.
The ocrea is tubular, veined, hairless, and has no marginal hairs.
Pseudoracemes 3–10 cm long at the stem tips and leaf axils bear flowers densely.
The tips of the inflorescences droop.
The flowers have no corolla; the conspicuous calyx is white to pale red.
The fruit is a flattened achene, slightly glossy blackish brown.
