Spreading water crowfoot

from Wikipedia, the free encyclopedia
Spreading water crowfoot
Spreading water crowfoot (Ranunculus circinatus), flowers on partially dry plants

Spreading water crowfoot ( Ranunculus circinatus ), flowers on partially dry plants

Systematics
Order : Buttercups (Ranunculales)
Family : Buttercup Family (Ranunculaceae)
Subfamily : Ranunculoideae
Tribe : Ranunculeae
Genre : Buttercup ( Ranunculus )
Type : Spreading water crowfoot
Scientific name
Ranunculus circinatus
Sibth.

The spreading water crowfoot ( Ranunculus circinatus Sibth .; Syn .: Ranunculus divaricatus auct.) Is a plant species within the genus buttercup ( Ranunculus ). It is an aquatic plant that is widespread in Eurasia .

description

The spreading water crowfoot is an evergreen , perennial, herbaceous plant that develops bare stems 5 to 300 centimeters long . It is a flooding underwater plant . The leaves are distributed on the stem. The leaf lobes are arranged in one plane. The outline of the leaf blade, which is divided into hair-thin segments, is circular. They stay spread out even out of the water and do not collapse limply like the diving leaves of other water cockfoot species.

The flowers , which rise above the surface of the water, are hermaphroditic and radial symmetry . The five protruding sepals have a length of 3 to 6 millimeters. The five free white, persistent petals have a length of up to 10 millimeters and crescent-shaped nectar glands. There are usually 20 to 25 (5 to 27) stamens present. The flower base is hairy. Most of the 42 to 48 (30 to 60) nuts are long hairy and balding; the stylus sit on the side.

The flowering period extends from May to August.

The number of chromosomes is 2n = 16.

Occurrence

The nominate form is widespread in temperate climatic zones in Europe and Asia. In Germany, the splaying water crowfoot occurs steadily in southern and central Bavaria (excluding the Alps), scattered in northern Bavaria, Baden-Württemberg, northern North Rhine-Westphalia, Thuringia, Saxony-Anhalt, Brandenburg, Lower Saxony, Mecklenburg-Western Pomerania and Schleswig-Holstein and rarely in Rhineland-Palatinate, southern North Rhine-Westphalia, Hesse and Saxony. Main areas of distribution are river valleys.

The species settles here in pondweed and water lily communities of eutrophic, muddy rivers, oxbow lakes, ditches, lakes and ponds, which are rich in bases and often calcareous, and also slightly salty in coastal marshes. Acidic waters are mostly avoided. It occurs mainly in societies of the Nymphaeion association, in the land form f. terrestris Gren. & Godr. also in societies of the association Nanocyperion.

swell

  • Eckhard Garve: Atlas of the endangered fern and flowering plants in Lower Saxony and Bremen (=  nature conservation and landscape management in Lower Saxony . Volume 30 ). 1994, ISBN 3-922321-68-2 .
  • Henning Haeupler, Thomas Muer: picture atlas of the fern and flowering plants of Germany . Ed .: Federal Agency for Nature Conservation (=  The fern and flowering plants of Germany . Volume 2 ). Eugen Ulmer, Stuttgart (Hohenheim) 2000, ISBN 3-8001-3364-4 .
  • Eckehart J. Jäger, Klaus Werner (Ed.): Excursion flora from Germany . Founded by Werner Rothmaler. 10th edited edition. tape 4 : Vascular Plants: Critical Volume . Elsevier, Spektrum Akademischer Verlag, Munich / Heidelberg 2005, ISBN 3-8274-1496-2 .

Web links

Commons : Spreading water crowfoot ( Ranunculus circinatus )  - album with pictures, videos and audio files

Individual evidence

  1. ↑ 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.  417 .