Unbranched Bur-reed
Sparganium emersum
The unbranched bur-reed is a perennial herbaceous aquatic and marsh plant commonly found in nutrient-rich, standing, or slow-moving waters. It is characterized by an unbranched inflorescence where the spherical male and female flower heads are arranged separately. The leaves are linear, typically stiffly erect or floating in deeper water. The plant develops underground runners and contributes significantly to the stabilization of shorelines.
Details
Oxygen production
Minor contribution to dissolved oxygen through submerged leaf elements.
Habitat function
Provides cover for juvenile fish and invertebrates; nesting material for waterfowl.
Nutrient uptake
Effective uptake of nitrogen and phosphorus from the sediment and water.
Food source for
Seeds for waterfowl; rhizomes for semi-aquatic mammals.
Human use
Used in constructed wetlands for wastewater treatment and as an ornamental plant for garden ponds.
Ecology
Ecological role
Primary producer, habitat former for macrozoobenthos and juvenile fish, and erosion control in riparian zones.
Natural predators
Waterfowl (seeds), muskrats and coypus (rhizomes).
Competitor species
Other reed plants such as common reed (Phragmites australis) or branched bur-reed (Sparganium erectum).
Ecosystem service
Nutrient retention in water bodies, shoreline stabilization, and provision of habitat for aquatic fauna.
Threats
Intensive watercourse maintenance (ditch clearing), herbicide input, and severe morphological changes to shorelines.
Scientific profile
Profile
Reproduction
Generative via seeds dispersed by water (hydrochory) or waterfowl. Vegetative via vigorous, creeping rhizomes that can form dense stands.
Protection & threats
Main threats
River engineering, intensive mechanical watercourse maintenance (dredging), heavy eutrophication, and herbicide input from agriculture.