Greenish yellow sedge

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Greenish yellow sedge
Greenish yellow sedge (Carex demissa)

Greenish yellow sedge ( Carex demissa )

Systematics
Commelinids
Order : Sweet grass (Poales)
Family : Sourgrass family (Cyperaceae)
Genre : Sedges ( Carex )
without rank: Yellow sedges (Carex flava agg.)
Type : Greenish yellow sedge
Scientific name
Carex demissa
Hornem.

The greenish yellow sedge ( Carex demissa Hornem. , Syn . : Carex tumidicarpa Anderss. ), Also known as misunderstood yellow sedge or ascending sedge , is a species of the genus of sedges ( Carex ) within the sour grass family (Cyperaceae). It is part of the species complex of yellow sedges ( Carex flava agg.).

description

Appearance and leaf

The greenish yellow sedge is a perennial herbaceous plant and usually reaches heights of 5 to 25, sometimes up to 40 centimeters. It has no runners and forms small, firm clumps . The usually arching stalk is usually as long or slightly longer than the leaves. The grass-green leaves are 2 to 4 millimeters wide.

Inflorescence, flower and fruit

The flowering period is mainly from May to July. The greenish yellow sedge is monoecious ( monoecious ). The inflorescence is distributed over a length of 3 to 20 cm on the stem. It has a short-stalked, terminal, about 10 to 20 mm long male spikelet and usually two to three female spikelets. All spikelets are somewhat apart. The bottom is often far removed and can sometimes reach the base of the stem. The female spikelets are 7 to 15 mm long and 6 to 8 mm wide. They belong to the variety of sedges in which the spikelets are shaped differently. The upper or the uppermost spikelets almost always contain only male flowers , while the lower or the lower almost always contain only female flowers. The bracts of the inflorescence are leaf-like and usually stand out clearly from the stem or are turned back; the lowest is usually longer than the inflorescence. The bract sheath of the lowest ear has an appendage at least 1 mm long on the upper edge.

The 3 to 4 mm long fruit sacs, with their distinct longitudinal nerves, are initially green, when ripe yellow-green. They are rather suddenly extended into the 1 to 1.5 mm long, more or less straight, two-toothed, smooth beak. You have 3 scars. The nuts are obovate, about 1.5 mm long and 1 mm wide. You do not fill the hose completely.

The number of chromosomes is 2n = 70.

Differentiation to similar species

The greenish yellow sedge ( Carex demissa ) differs from the very similar common late yellow sedge ( Carex viridula ), among other things, in the longer fruit sacs and the often widely separated lower spikelet. However, it is connected to it by transitions and can therefore not always be clearly separated. The similar common yellow sedge ( Carex flava ) has longer fruit sacs with clearly curved beaks, which reach roughly the length of the remaining part of the tube.

Occurrence

The greenish yellow sedge is a north-subatlantic floral element . The overall distribution of Carex demissa is poorly known as it was not previously separated from Carex viridula . Carex demissa occurs mainly in Macaronesia and in western and north-western Europe and from the Mediterranean to the western Himalayas; to the north its area extends to southern Finland and the Baltic States , eastwards to Poland , to the western Carpathians and the Ukraine , to the south to the northern part of the Iberian Peninsula and to northern Italy ; there are also some deposits in Atlantic North America . Carex demissa is a neophyte in New Zealand and Tasmania .

In Germany the greenish yellow sedge occurs very scattered, only in the western part it is also more common. Apparently, it is rare in Austria and Switzerland.

Carex demissa grows in fens , spring meadows and swampy meadows . It thrives best on mildly-moderately acidic swamp humus soils . It is a character species of the Parnassio-Caricetum from the association Caricion fuscae, but also occurs in societies of the Caricion davallianae.

Systematics

One can distinguish between two subspecies:

  • Carex demissa subsp. cedercreutzii (Fagerstr.) Jac.Koopman: It occurs in the Azores.
  • Carex demissa subsp. demissa : It occurs on the Canary Islands, Madeira and from Europe to the western Himalayas.

literature

  • Konrad von Weihe (ed.): Illustrated flora. Germany and neighboring areas. Vascular cryptogams and flowering plants . Founded by August Garcke. 23rd edition. Paul Parey, Berlin / Hamburg 1972, ISBN 3-489-68034-0 .
  • Erich Oberdorfer : Plant-sociological excursion flora . With the collaboration of Theo Müller. 6th, revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 1990, ISBN 3-8001-3454-3 .
  • Henning Haeupler, Thomas Muer: picture atlas of the fern and flowering plants of Germany . Ed .: Federal Agency for Nature Conservation (=  The fern and flowering plants of Germany . Volume 2 ). Eugen Ulmer, Stuttgart (Hohenheim) 2000, ISBN 3-8001-3364-4 .
  • Dietmar Aichele, Heinz-Werner Schwegler: Our grasses. Franckh, Stuttgart 1986, ISBN 3-4400-5284-2 .

Individual evidence

  1. ↑ Carex demissa Hornem., Ascending Sedge. In: FloraWeb.de.
  2. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp.  191 .
  3. ↑ a b c d Rafaël Govaerts (Ed.): Carex demissa. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved October 18, 2016.
  4. ^ Oskar Sebald, Siegmund Seybold, Georg Philippi, Arno Wörz (eds.): The fern and flowering plants of Baden-Württemberg . tape 8 : Special part (Spermatophyta, subclasses Commelinidae part 2, Arecidae, Liliidae part 2): Juncaceae to Orchidaceae . Eugen Ulmer, Stuttgart (Hohenheim) 1998, ISBN 3-8001-3359-8 .

Web links

Commons : Greenish Yellow Sedge ( Carex demissa )  - Album containing pictures, videos and audio files