Little mermaid
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Little mermaid ( Najas minor ) |
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The little mermaid ( Najas minor ) is a species of the mermaid herbs ( Najas ) genus within the frog-bite family (Hydrocharitaceae). This aquatic plant thrives in fresh water .
description
The little mermaid is an herbaceous plant that reaches heights of 5 to 30 centimeters. The fresh stem is pliable, serrated, curved back, thin, branched with plenty of fork branches, fragile and not prickly. The leaves are in pairs, are only 0.5 mm wide, clearly serrated and arched back.
Flowering period extends from June to September. The inconspicuous flowers are unisexual. The male flowers are of a baggy spathe wrapped and have a bilobar Perigon and only one stamen . The female flowers have no flower envelope and sit in the leaf axils.
The chromosome number of the species is 2n = 12, 24 or 36.
Occurrence
The little mermaid is widespread in tropical and warm temperate areas. It occurs in Eurasia (to India and Japan ) and in North Africa . In North America it is a neophyte .
The little mermaid is only found sporadically in Central Europe . In Germany it occurs only sporadically in the lowlands in Mecklenburg-Western Pomerania and Brandenburg , and also in Upper Franconia between Hallertau and the Danube . In Germany it is found mainly in the Upper Rhine area; it occurs only rarely at Lake Constance; few sites are known in the Danube region and in Upper Franconia. It occurs in Austria and Switzerland. It is rarely found on the Upper Rhine between Strasbourg and the mouth of the Main . In larger areas of Central Europe it appears to be completely absent.
The little mermaid thrives in warm summer waters. It inhabits stagnant or very slowly flowing waters, where it grows in the calmest and most sheltered places. It is sensitive to pollution. It is a character species of the Potamogetoneto-Najadetum marinae from the Potamogetonion association. It thrives in 30–50 (200) centimeters of water.
literature
- Siegmund Seybold : The flora of Germany and the neighboring countries. A book for identifying all wild and frequently cultivated vascular plants . Founded by Otto Schmeil , Jost Fitschen . 95th completely revised and expanded edition. Quelle & Meyer, Wiebelsheim 2011, ISBN 978-3-494-01498-2 .
- Henning Haeupler, Thomas Muer: picture atlas of the fern and flowering plants of Germany . Published by the Federal Agency for Nature Conservation (= The fern and flowering plants of Germany . Volume 2 ). 2nd corrected and enlarged edition. Eugen Ulmer, Stuttgart (Hohenheim) 2007, ISBN 978-3-8001-4990-2 .
- Dietmar Aichele, Heinz-Werner Schwegler: The flowering plants of Central Europe . 2nd Edition. tape 5 : Swan flowers to duckweed plants . Franckh-Kosmos, Stuttgart 2000, ISBN 3-440-08048-X .
Individual evidence
- ↑ Little mermaid. In: FloraWeb.de.
- ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Page 108. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5
- ↑ Rafaël Govaerts (Ed.): Najas minor. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 22, 2020.
Web links
- Little mermaid. In: FloraWeb.de.
- Little mermaid . In: BiolFlor, the database of biological-ecological characteristics of the flora of Germany.
- Profile and distribution map for Bavaria . In: Botanical Information Hub of Bavaria .
- Najas minor All., Map for distribution in Switzerland In: Info Flora , the national data and information center for Swiss flora .
- Distribution in the Netherlands [1] (Dutch)
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
- Günther Blaich: data sheet with photos.