Carex muskingumensis Schweinitz (N-Am.) - A very rare escape from cultivation (or merely a garden throw-out). A small colony of about 30 plants was discovered on waste land in Nieuwerkerken (Schelfheide) in 2010, apparently well-established (see http://waarnemingen.be/waarneming/view/48646993). Also known since several years from a pond margin in a small park in Gent, doubtlessly as a relic of cultivation. In 2011 also seen in Heppen (Leopoldsburg). Carex muskingumensis is increasingly planted as an ornamental and new records will probably come to light in a near future. Similar recent records are also available, for instance, from Germany (Jäger & Werner 2005) and the Netherlands (van der Meijden & Holverda 2006).
Even non-flowering plants of Carex muskingumensis are fairly characteristic (see photos from Heppen). Leaf blades are somewhat drooping and evenly distributed along stem. Hence its Dutch vernacular name "Palmzegge".
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Selected literature:
Kooman J. (2015) Allochtone Zeggen (Carex-soorten) in Nederland. Gorteria 37: 73-83.