Blue-green swaths
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Blue-green plumes ( Glyceria declinata ) |
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| Bréb. |
The blue-green swath ( Glyceria declinata ) is a species of the genus swath ( Glyceria ) and thus the family of sweet grasses (Poaceae).
description
The blue-green swath is persistent, its stalks are arching with 1–3 knots and the plant is only 10–40 cm high. The leaf sheaths are closed to the top, smooth and glabrous. The leaf blades are 4–20 cm long and 4–8 mm wide. The ligule is a 4-9 mm long, pointed membranous border. The flower panicle is 5–20 (-30) cm long, contracted, lanceolate in outline, upright or usually slightly nodding and one-sided. The lower side branches go 1–3 away from the main axis; the longer ones have 2–6, the shorter 1–2 spikelets. The spikelet pedicels are 2–10 mm long, smooth and glabrous. The spikelets are 8-15 flowered, 12–24 mm long. The glumes are single-nerved, the lower one is 1.5–2.5 mm long, the upper 2.5–3 mm long. The lemmas are seven-veined and 3.5–5 mm long. They are bluntly three-lobed or 3-5-toothed at the upper end. The palea are two-veined, as long as the lemma and often towering over them with their two teeth. The anthers are 0.5–1 mm long, purple or yellowish in color.
The flowering period is June to August.
The number of chromosomes is 2n = 20.
distribution
The blue-green plume occurs in Europe, Macaronesia and Morocco.
ecology
The blue-green swath thrives in pioneering societies on wet forest paths, on well-swelled edges of roads and ditches, on seeping, moderately nutrient-rich and base-rich, lime-poor, moderately acid, humus-rich, sandy loam soils. It is a semi-shade grass and occurs mainly in fresh step societies with the tender rush ( Juncus tenuis ) and in societies of the associations Agropyro-Rumicion or Polygonion avicularis. It is a differential species of the Stellario-Scirpetum setacei association from the Nanocyperion association. In the Alps, the species rises to around 1400 meters above sea level.
Taxonomy
The blue-green swath was already in 1859 from Normandy by Brébisson in his Fl. Normandie, ed. 3: 354, but the species was not considered for a long time. It was then regarded as a subspecies of Glyceria fluitans and only the number of chromosomes proved it to be an independent species. Only after the Second World War was the distribution of the species in Europe more precisely recorded.
literature
- Hans Joachim Conert: Glyceria . In: Gustav Hegi : Illustrated flora of Central Europe . 3rd ed., Volume I, Part 3, pp. 448-450. Verlag Paul Parey, Berlin, Hamburg, 1987. ISBN 3-489-52320-2 (description)
Individual evidence
- ↑ 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. 218-219 .
- ↑ Rafaël Govaerts (Ed.): Glyceria declinata. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved June 8, 2020.
