Dwarf Sedge

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Dwarf Sedge
Dwarf Sedge (Cyperus michelianus)

Dwarf Sedge ( Cyperus michelianus )

Systematics
Commelinids
Order : Sweet grass (Poales)
Family : Sourgrass family (Cyperaceae)
Subfamily : Cyperoideae
Genre : Sedge grass ( Cyperus )
Type : Dwarf Sedge
Scientific name
Cyperus michelianus
( L. ) Delile

The dwarf sedge ( Cyperus michelianus ) is a species of the genus of the sedge ( Cyperus ) within the family of the sour grass plants (Cyperaceae).

description

Vegetative characteristics

Illustration of Brown Sedge ( Cyperus fuscus , left, 1a-e) and Dwarf Sedge ( Cyperus michelianus , right, 2a-f)

The dwarf sedge is an annual herbaceous plant and reaches stature heights of 2 to 10, rarely up to 15 centimeters. The dwarf sedge grows in small, mostly dense lawns. The ascending stem is triangular. The leaves are divided into leaf sheath and leaf blade. The lower leaf sheaths are dark red. The simple leaf blade is flat, not gullet folded and 0.7 to 2 millimeters wide and 2 to 20 inches long.

Generative characteristics

inflorescence

The flowering period extends from July to September. The inflorescence is very dense, almost spherical and about 1 centimeter long. There are three to eight bracts available, which are 8 to 12 inches long and broadened at the base. The ears are only 3 to 5 millimeters long and 1 to 2 millimeters thick. Despite their small size, they contain 8 to 20 flowers that are in three longitudinal rows. The husks are about 2 millimeters long and about 0.5 millimeters wide, elongated to narrowly ovate and more pointed than blunt. They are studded with a 0.3 millimeter long spiked tip and colored whitish with a green keel. The flowers have two stigmas.

Occurrence

Cyperus michelianus is widespread in Eurasia, Africa and Australia. The dwarf sedge is very rare in Central Europe . In Central Europe it occurs only on the Elbe near Wittenberg , in the Czech Republic , Slovakia , in southwestern Poland and in eastern Austria ; it can also be found occasionally at the foot of the Alps and in the Bresse in France .

The dwarf sedge thrives best on muddy, base-rich, but lime-poor or even lime-free and warm summer soils , which should be flooded continuously or at least temporarily in spring and into summer. It thrives in societies of the Isoeto-Nanojuncetea class, especially in those of the sub-group Elatino-Eleocharitenion ovatae.

Systematics

The first publication took place in 1753 under the name (Basionym) Scirpus michelianus by Carl von Linné . The new combination to Cyperus michelianus (L.) Delile was published in 1813 by Alire Raffeneau-Delile . Other synonyms for Cyperus michelianus (L.) Delile are: Isolepis micheliana (L.) Roem. & Schult. , Fimbristylis micheliana (L.) Rchb. , Dichostylis micheliana (L.) Nees , Juncellus michelianus (L.) leaf. & McCann .

In Cyperus michelianus (L.) Delile there are two subspecies:

  • Cyperus michelianus subsp. michelianus : It occurs in Africa, Eurasia and Australia.
  • Cyperus michelianus subsp. pygmaeus (Rottb.) Asch. & Graebn. (Syn .: Cyperus pygmaeus Rottb. , Dichostylis pygmaea (Rottb.) Nees , Pycreus pygmaeus (Rottb.) Nees , Juncellus pygmaeus (Rottb.) CBClarke ): It occurs in the tropics and subtropics of the Old World including the East in front.

literature

Individual evidence

  1. ↑ a b c d e Rafaël Govaerts (ed.): Cyperus michelianus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved October 26, 2016.
  2. ^ 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.  157 .

Web links

Commons : Dwarf Sedge ( Cyperus michelianus )  - Collection of images, videos and audio files