Middle sundew
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Middle sundew ( Drosera intermedia ) |
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The mean sundew ( Drosera intermedia ) is a species from the genus sundew ( Drosera ), a genus of carnivorous plants .
description
The mean sundew is a perennial herbaceous plant . It forms a down-to-earth rosette with a total height of up to 10 cm. The plant appears in spring from a winter bud called the hibernacle .
It is characterized by numerous and hair-thin tentacles, covered with a sticky secretion, on the spatulate catch leaves with a leaf blade two to four times as long as it is wide, which sit on long, smooth leaf stalks.
It blooms from July to August with 3 to 8 white flowers , which sit in a one-sided raceme on an inflorescence up to 15 cm high . After flowering and the formation of egg-shaped, furrowed capsules with a large number of small seeds, the plant goes into hibernation in early autumn by forming a winter bud again and drawing in the leaves.
The number of chromosomes is 2n = 20.
distribution
The mean sundew occurs in the northern hemisphere in Europe and in eastern North and eastern South America.
In addition to the round-leaved sundew ( Drosera rotundifolia ) and the long-leaved sundew ( Drosera anglica ), it is the only representative of the genus indigenous to Europe, where it can be found in nutrient-poor bogs and bog forests as well as on alternating moor-sandy soils. Preferred locations are full sun, waterlogging soils. The species is protected in Germany. In Central Europe it is a character species of the Rhynchosporetum albae from the association Rhynchosporion albae in the class of low and intermediate moors.
The plants are hardy and tolerate longer periods of frost. A special form of the species occurs in South America . This differs from the normal form in that it does not form any hibernacles and is not frost hardy .
Systematics
The plant hybridizes with the round-leaved sundew to Drosera × eloisiana and with the thread-like sundew to Drosera × hybrida. Both crosses are sterile.
literature
- Ludwig Diels : Droseraceae (= The Plant Kingdom . 26 = 4, 112, ZDB -ID 846151-x ). Engelmann, Leipzig 1906, ( The only monograph of the Droseraceae to date . ).
- Wilhelm Barthlott , Stefan Porembski, Rüdiger Seine, Inge Theisen: Carnivores. Biology and culture of carnivorous plants. Eugen Ulmer GmbH & Co., Stuttgart 2004, ISBN 3-8001-4144-2 .
Individual evidence
- ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3131-5 , p. 479.
Web links
- Middle sundew. In: FloraWeb.de.
- Distribution map for Germany. In: Floraweb .
- Drosera intermedia Hayne In: Info Flora , the national data and information center for Swiss flora . Retrieved October 30, 2015.
- Distribution in the northern hemisphere according to Eric Hultén
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
