A beautiful and elegant aquatic perennial with umbrella-like clusters of pink flowers. Although the long thin, sword-like leaves of this plant resemble a rush or a sedge, and the name of the plant implies this, it is not and is unrelated. It grows up to 80 cm tall.
The seeds are made up of tissue which are filled with air. This allows the seeds to become buoyant when they fall from the parent plant so they may float a distance away on the water’s current to germinate.
It flowers July to August. It grows and thrives in the shallows of slow-moving freshwater ponds, ditches and rivers. Locally common only in England and Wales.