Swiss pondweed
| Swiss pondweed | ||||||||||||
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| Scientific name | ||||||||||||
| Stuckenia helvetica | ||||||||||||
| ( G. Fisch. ) Holub |
The Swiss pondweed ( Stuckenia helvetica (G. Fisch.) Holub , Syn .: Potamogeton helveticus (G. Fisch.) Walo Koch ) is a species of the genus of the spawning herbs ( Potamogeton ) in the family of the spawning herbs (Potamogetonaceae).
features
The Swiss pondweed is an evergreen , perennial herbaceous plant . The rhizome is usually 2 to 3, rarely up to 8 millimeters thick. The stem of this underwater plant (submerged plant) is up to 4 meters long and heavily branched. The leaves are stiff. The lower leaf sheaths are inflated and up to 6 inches long. This species does not produce flowers or fruits.
The Swiss pondweed resembles the comb pondweed ( Stuckenia pectinata , Syn .: Potamogeton pectinatus ), but is stronger.
The flowering period extends from June to September.
Occurrence
The Swiss pondweed is rarely found in the southern Rhine Valley as far as Lake Constance . Here it can be found in the bank area of nutrient-rich waters. The species is believed to be critically endangered. It is a character species of the Ranunculetum fluitantis.
Systematics
It is possible that the Swiss pondweed is a hybrid of filiform pondweed ( Stuckenia filiformis ) and crested pondweed ( Stuckenia pectinata ). Sometimes it is only viewed as a variety of the crested spawn herb.
supporting documents
literature
- Siegmund Seybold : Flora of Germany and neighboring countries. A book for identifying vascular plants that grow wild and often cultivated . Founded by Otto Schmeil , Jost Fitschen . 93rd completely revised and expanded edition. Quelle & Meyer, Wiebelsheim 2006, ISBN 3-494-01413-2 .
Individual evidence
- ↑ a b Swiss pondweed. In: FloraWeb.de.
- ^ Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Page 102. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5
Web links
- Swiss pondweed. In: FloraWeb.de.
- Swiss pondweed . In: BiolFlor, the database of biological-ecological characteristics of the flora of Germany.
- Potamogeton helveticus (G. Fisch.) W. Koch In: Info Flora , the national data and information center for Swiss flora .
- 32a in Michael Dienst: Identification key for the submerged flowering plants and candelabrum algae found in Lake Constance. Version August 2006. (PDF file; 1018 kB)