Three-veined sedge

from Wikipedia, the free encyclopedia
Three-veined sedge
Three-veined sedge (Carex trinervis), illustration

Three-veined sedge ( Carex trinervis ), illustration

Systematics
Monocots
Commelinids
Order : Sweet grass (Poales)
Family : Sourgrass family (Cyperaceae)
Genre : Sedges ( Carex )
Type : Three-veined sedge
Scientific name
Carex trinervis
Degl.

The three-veined sedge ( Carex trinervis ) is a species of the genus Sedges ( Carex ) within the sour grass family (Cyperaceae). It thrives on Europe's Atlantic coasts.

description

The three-veined sedge grows as a perennial herbaceous plant and reaches heights of 10 to 40, rarely up to 60 centimeters. It forms long runners . The stems are bluntly triangular and perfectly smooth. The leaves are 2 to 3 millimeters wide, gray-green and folded like a bristle. They are not curved back and are at least as long as the stem. The edges roll up as they dry. The basal sheaths are spread, are pale brown and do not fray like a network.

It is a variegated sedge; the male and female spikelets are different. The spikelets are spaced apart. There are one to four male spikelets that are 20 to 40 millimeters long. The two or three female spikelets are 10 to 40 millimeters long, densely flowered, erect and almost sessile. The lowest bract is longer than the inflorescence . The upper bracts also have at least a short blade. The bracts of the female flowers are brown and have a three-veined green keel and a narrow skin edge. They are as long as the fruit or slightly shorter. The stylus has two scars .

The 3.5 to 5 millimeter long fruit is yellowish-green to gray-green, often with purple spots, plano-convex, glabrous and clearly longitudinally veined; it has no beak.

distribution

The three-veined sedge is restricted to the Atlantic coasts of Europe. It occurs from Denmark to southwestern Spain. It is a submeridional to temperate, euocean-littoral floral element .

In Central Europe it settles primarily in nutrient-poor, damp, swampy and muddy places in dune valleys. It occurs in Germany sporadically on the East Frisian Islands from Spiekeroog , Memmert , Juist , Norderney , Baltrum , Langeoog , and Wangerooge to Borkum ; it also occurs on the North Frisian islands of Amrum and Sylt .

It is an association character type of the Caricetum trinervi-nigrae (in the association Caricion nigrae).

The three-veined sedge thrives best on wet, solidified-sandy and above all in boggy, base-poor and mostly lime-free, acidic soils .

literature

  • Rudolf Schubert , Klaus Werner, Hermann Meusel (eds.): Excursion flora for the areas of the GDR and the FRG . Founded by Werner Rothmaler. 13th edition. tape 2 : vascular plants . People and knowledge, Berlin 1987, ISBN 3-06-012539-2 (area).
  • Siegmund Seybold (Ed.): Schmeil-Fitschen interactive . CD-ROM, version 1.1. Quelle & Meyer, Wiebelsheim 2002, ISBN 3-494-01327-6 .

Individual evidence

  1. ↑ Rafaël Govaerts (ed.): Carex trinervis. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved October 25, 2016.
  2. ↑ a b c Dietmar Aichele, Hans-Werner Schwegler: The flowering plants of Central Europe , Volume 5, swan flower plants to duckweed plants . 2nd revised edition, Franckh-Kosmos, Stuttgart 2000, ISBN 3-440-08048-X .
  3. ↑ Rolf Niedringhaus, Volker Haeseler, Peter Janiesch (eds.): The flora and fauna of the East Frisian Islands - species lists and evaluations of biodiversity. In: Series of publications National Park Lower Saxony Wadden Sea. Volume 11.

Web links