is a species of willowherb
known by the common name marsh willowherb
. This plant has a circumboreal
distribution, and can be found farther south in mountainous areas. This is a hairy perennial growing spindly stems sometimes exceeding half a meter in height. Its stems have widely-spaced oval to linear leaves two to seven centimeters long. The stems are tipped with hairy inflorescences
of small white or pink flowers. Each flower has four petals which may be quite minute to almost a centimeter long and notched to form two lobes. The fruit is a hairy capsule 3 to 9 centimeters long.