Blister sedge
Carex vesicaria
The blister sedge is a perennial herbaceous plant that reaches heights of 30 to 100 centimeters. It forms long underground rhizomes and often grows in loose mats or small clumps in marshlands and along shorelines. A characteristic feature is the significantly inflated, yellowish-green utricles (perigynia), which give the species its name. It prefers wet, temporarily flooded, moderately nutrient-rich, and usually lime-poor soils.
Details
Oxygen production
Minor oxygen input into the sediment via the aerenchyma.
Habitat function
Serves as a breeding site for marsh birds and a hiding place for amphibians and insects.
Nutrient uptake
Absorbs nitrogen and phosphate from the soil and water, contributing to the purification of seepage water.
Food source for
Seeds serve as food for birds; leaves are eaten by caterpillars of some butterfly species.
Human use
Formerly used as filling material for mattresses or as bedding in stables.
Ecology
Ecological role
Important component of large sedge swamps, providing structure in transition zones between water and land.
Natural predators
Waterfowl (seed consumption), muskrats (rhizomes).
Competitor species
Other large sedges such as Carex rostrata or common reed (Phragmites australis).
Ecosystem service
Shore protection through root stabilization, nutrient retention in wetlands.
Threats
Drainage of bogs, intensive agriculture, eutrophication of habitats.
Scientific profile
Profile
Reproduction
Generative via seeds (dispersal of inflated perigynia by water) and vegetative via far-creeping rhizomes.
Protection & threats
Main threats
Drainage of wetlands, intensive agricultural use of riparian zones, and excessive eutrophication.