Schoenoplectus triqueter

Schoenoplectus triqueter is a medium-sized sedge, growing tall, with long, thick (2–10 mm in diameter) rhizomes and thin stems (2–4 mm in diameter). The sedge flowers and fruits in summer; the fruit are small, brown, and bristly. == Distribution and conservation ==

S. triqueter inhabits wetlands, shores, and muddy river banks. The species was classified as "Least Concern" by the IUCN in 2013. In some regions, it is classified as endangered, and the species has been extirpated from the Czech Republic. S. triqueter is also known to be in decline in north-central Europe and in the British Isles. British Isles In the British Isles, although many populations have been lost due to construction projects and land reclamation, populations in Ireland around the River Shannon persist in some numbers. It has been suggested that its distribution is restricted due to the plants' low tolerance of salinity. Mainland Europe In Portugal, the species is classified as vulnerable. North America In North America, S. triqueter has been introduced in and around the lower Columbia River tidal region, where it is known to produce fertile hybrids with S. tabernaemontani. It is found in southwestern Washington state and adjacent parts of Oregon. == References ==