Nutty water star

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Nutty water star
Systematics
Euasterids I
Order : Mint family (Lamiales)
Family : Plantain family (Plantaginaceae)
Tribe : Callitricheae
Genre : Water stars ( callitriche )
Type : Nutty water star
Scientific name
Callitriche obtusangula
Le Gall ex Hegelm.

The Nussfrüchtige water rating ( Callitriche obtusangula ) is a plant that for the genus of callitriche ( Callitriche ) within the family of Plantain Family belongs (Plantaginaceae). This aquatic plant occurs in fresh and brackish water mainly in Western Europe and the Mediterranean , rarely in Central Europe .

description

The nut-fruited water star grows as a hibernating, perennial herbaceous plant .

This aquatic plant has heterophyllia . The submerged leaves are linear with a length of 10 to 40 mm and a width of 0.5 to 2 mm and strongly bulged at the top. During the flowering period, a relatively large floating leaf rosette with 10 to 20 leaves is formed. There are eight to ten-cell shield hairs ( trichomes ). The floating leaves are divided into an almost colorless petiole and fleshy, broad rhombic, three-ribbed and therefore often wavy leaf blades; they have raised leaf veins .

The flowering period usually extends from June to September, sometimes from April to October. The conspicuous cover sheets are 5 mm long and durable. Flowers are only present on the floating leaf rosette. The cream-colored anthers are about 1 mm wide. The yellow pollen grains are usually curved, oblong, elliptical, bean-shaped and usually twice as long as they are wide.

The fruit, which is brown when ripe, is about 1.5, rarely up to 2 mm, and about 1.2, rarely up to 1.7 mm, longer than wide and elliptical in side view. The partial fruits have no keel or wings and are rounded on the back with arched and rounded edges.

The number of chromosomes is 2n = 10.

Occurrence

The nut-fruited water star occurs mainly in winter-mild areas in Western Europe and in the Mediterranean area. Its distribution area extends from Portugal via France to Great Britain, north to Iceland and Scandinavia and east to Estonia, western Ukraine, Romania and Greece. It is also found in the Azores, North Africa and in the mountains of the tropics.

In Germany there are only sites in the west and south-west. The species is spreading.

This aquatic plant thrives in flowing and stagnant waters at water depths of 25 to 60 cm with nutrient-rich, often heavily polluted water, bearing salt and therefore also found in the brackish water of the marshes. In the rivers it forms its own plant community in places, it is a characteristic species of the association Callitrichetum obtusangulae Seib. 1962. Otherwise it also occurs in Apietum nodiflori from the association of reeds (Sparganio-Glycerion fluitantis). Since it tolerates dehydration well, it often grows as a landform.

Taxonomy

The first description of Callitriche obtusangula was made in 1864 by Nicholas Joseph Marie Le Gall de Kerlinou in Christoph Friedrich Hegel Maiers monograph of the genus Callitriche , S. 54th

swell

  • 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 .
  • Oskar Sebald, Siegmund Seybold, Georg Philippi, Arno Wörz (eds.): The fern and flowering plants of Baden-Württemberg . tape 5 : Special part (Spermatophyta, subclass Asteridae): Buddlejaceae to Caprifoliaceae . Eugen Ulmer, Stuttgart (Hohenheim) 1996, ISBN 3-8001-3342-3 .
  • Heinz-Dieter Krausch: color atlas water and bank plants . Eugen Ulmer Verlag, 1999, ISBN 3-8001-3352-0
  • Nutty water star. In: FloraWeb.de. (Description and Occurrence Sections) Retrieved April 29, 2013
  • Profile at Botanik im Bild / Flora von Österreich with extract from M. Fischer, W. Adler, K. Oswald: Excursion flora from Austria, Liechtenstein and South Tyrol , 3rd edition 2007, ISBN 978-3-85474-187-9 .
  • Callitriche obtusangula at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed May 1, 2013.

Individual evidence

  1. ↑ a b c d e f Nut-fruited water star. In: FloraWeb.de. Retrieved April 29, 2013
  2. ↑ a b c d e f g h Profile at Botanik im Bild / Flora von Österreich with extract from M. Fischer, W. Adler, K. Oswald: Exkursionsflora von Österreich, Liechtenstein and Südtirol , 3rd edition, 2007, ISBN 978- 3-85474-187-9 . Retrieved May 1, 2013
  3. ↑ 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.  790-791 .

Web links