Japanese name: イワアカバナ（岩赤花） Scientific name:Epilobium amurense subsp. cephalostigma
[Overview]
A perennial 25–100 cm tall, found along mountain streams and similar places.
The stem branches in the upper part.
The stem has 2 ridges and is usually covered with short curved hairs, which are especially numerous on the ridges.
Leaves are simple and opposite, oblong to oblong-lanceolate, 3–9.5 cm long and 0.8–3 cm wide.
The leaf margins are serrated.
Hairs grow on the veins on the underside of the leaves.
Flowers are solitary in the leaf axils, pale pink or white with 4 petals, and the tip of each petal is shallowly 2-lobed.
The stigma is spherical.
A slender ovary lies below the flower.
The fruit is a slender capsule 3.5–7 cm long.
The seeds have a whitish pappus.
