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Sparganium erectum

Authority L. Family Liliopsida:Commelinidae:Typhales:Sparganiaceae Synonyms Sparganium eurycarpum (Engelm.), Sparganium ramosum (Huds.) Common names aufrechter igelkolben, branched bur-reed, bur-reed, grenet pindsvineknop, grenigelknopp, haarapalpakko, kantvass, kjempe-piggknopp, småfrugtet pindsvineknop, storigelknopp, vanlig storigelknopp Editor Ecocrop code 17012

Notes
DESCRIPTION: It is a herbaceous aquatic plant reaching up to more than 1 meter in height and 0.6 meter in width. The leaves are long, keeled, alternate, stiff and erect or limp and floating, linear and up to 3 cm wide. The stem carries a branched inflorescence of globular heads. USE: The rhizome and stem is edible when cooked. An infusion can be mixed with other plant leaves and used in the treatment of chills. It is grown as an ornamental in garden ponds. GROWING PERIOD: Perennial. COMMON NAMES: Bur-reed, Branched bur-reed, Aufrechter igelkolben. FURTHER INF: It can be found in ungrazed marshes, wet ditches and shallow water of swamps, canals, fens, lake-sides and ponds. It grows best in silty mud and peat in nutrient rich water between 10-20 cm deep. It is easily uprooted and therefore does not grow well by fast-flowing rivers or streams. It can be found in most of central and northern United States and adjacent Canada and in Europe from France through southern Scandinavia and the northern Mediterranean region into northern Russia.
Sources
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=SPER