Läger bluegrass

from Wikipedia, the free encyclopedia
Läger bluegrass
Lager bluegrass (Poa supina)

Lager bluegrass ( Poa supina )

Systematics
Commelinids
Order : Sweet grass (Poales)
Family : Sweet grasses (Poaceae)
Subfamily : Pooideae
Genre : Bluegrass ( Poa )
Type : Läger bluegrass
Scientific name
Poa supina
Schrad.

The Läger bluegrass ( Poa supina ) is a species of the genus bluegrass ( Poa ) within the sweet grass family (Poaceae).

description

Vegetative characteristics

The Läger bluegrass is a perennial herbaceous plant that reaches heights of 4 to 15, rarely up to 30 centimeters. It forms yellow-green to grass-green, more or less spread out lawns . The Läger bluegrass develops underground runners . The independently upright stalks have two or three knots .

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

The alternate leaves arranged on the stalks are divided into leaf sheath and leaf blade. The leaf sheaths are closed almost to the top. The ligule is a 0.6 millimeter long rounded edge on the renewal shoots and 1 to 2 millimeters long on the uppermost stalk leaves. In contrast to the annual bluegrass ( Poa annua ), the edge of the ligule does not run down the edges of the leaf sheaths. The leaf blades on renewal shoots are 3 to 6 inches long and about 3 millimeters wide. They are spread out flat and often curved into a sickle shape. The stalk leaves are 2 to 5 millimeters wide.

Generative characteristics

The flowering period extends from April to June, in high altitudes July to August. The paniculate inflorescence is 4 to 6 centimeters long, loose, broadly triangular in outline and composed of about 20, rarely up to 40 spikelets. The side branches are smooth and go individually from the main axis. The spikelets are three to seven flowered and 3.5 to 6 millimeters long. The lower flowers are hermaphroditic, the upper one or two female. The spikelets are green and usually tinged purple. The lower glume is single-nerved, 1.7 to 2.5 millimeters long, the upper is three-nerved and 2.2 to 2.8 millimeters long. The lemmas are five-nerved and 2.4 to 3 millimeters long, egg-shaped and short hairy in the lower half on the keel and the outer lateral nerves. The palea are two-veined and as long as the lemma. The anthers are 1.1 to 1.6 millimeters long when open and 1.7 to 2 millimeters long when closed.

The number of chromosomes is 2n = 14.

Occurrence

The Läger bluegrass occurs from Europe to Mongolia and the Himalayas and also in Morocco . The Läger-Rispengras rises in the Black Forest at altitudes of 500 to 1490 meters. In the Bavarian Alps it also grows at altitudes of up to 2375 meters, in Switzerland near Zermatt at an altitude of 3120 meters.

Läger bluegrass grows in Central Europe in step and lager societies in the mountains, on fresh, nitrogen-rich, sandy, even muddy-humic loam or clay soils . Poa supina is a character species of the Alchemillo-Poetum supinae from the association Polygonion avicularis, but also occurs in societies of the association Rumicion alpinae or in grazed societies of the classes Salicetea herbaceae or Montio-Cardaminetea. At lower altitudes it also occurs in plant communities of the class Plantaginetea majoris.

Systematics

The first description of Poa supina was in 1806 by Heinrich Adolf Schrader in Fl. Germ. , Page 289. Synonyms for Poa supina Schrad. are: Poa annua var. supina (Schrad.) Lej. , Poa annua subsp. supina (Schrad.) Husn. , Ochlopoa supina (Schrad.) H. Scholz & Valdés , Poa annua subsp. varia (Gaudin) Gaudin .

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

With the annual bluegrass ( Poa annua ) Poa supina forms the hybrid Poa × nannfeldtii (H.Scholz ex Val.N.Tikhom.) Nosov . This hybrid has the chromosome number 2n = 21.

swell

literature

Individual evidence

  1. ^ Hans Joachim Conert: Poa supina. Pp. 671-672. In: Gustav Hegi : Illustrated flora of Central Europe . 3rd edition, Volume I, Part 3, Verlag Paul Parey, Berlin, Hamburg, 1987, ISBN 3-489-52320-2 .
  2. ↑ a b c 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.  222 .
  3. ↑ a b Rafaël Govaerts (Ed.): Poa supina. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved June 14, 2020.

Web links