Two-flowered sandwort
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Two-flowered sandwort ( Arenaria biflora ) |
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| Arenaria biflora | ||||||||||||
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The twoflower chickweed ( Arenaria biflora ), also Two flowers Chickweed is a plant kind in the family of the Pink family (Caryophyllaceae). It occurs in the European mountains.
description
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The two-flowered sandwort grows as a grassy, perennial herbaceous plant that reaches heights of about 10 to 30 cm. The creeping stems are branched and have short hairs.
The opposite leaves are divided into petiole and leaf blade. The short petiole is ciliate. With a length of 2 to 5 millimeters, the bald leaf blade is once or twice as long as it is wide, broadly ovoid to rounded and blunt at the front.
The flowering period extends from July to September. The flowers are usually singly or in pairs on lateral, up to 20 millimeters long shoots. The hermaphrodite flowers are radially symmetrical and five-fold. The five pointed sepals are one to three-veined and have narrow skin margins. The five white, bare petals are 4 to 4.5 millimeters long and barely longer than the sepals.
The capsule fruit typical of the genus Arenaria pops up with six short teeth. The seeds have no appendages.
The number of chromosomes is 2n = 22.
Occurrence
The distribution area includes the eastern Pyrenees, Carpathians, Apennines, Balkans and the silicate areas of the Alps.
Moist, lime-poor soils, snow valleys, open lawns, scree and rubble are preferred as locations. The two-flowered sand herb thrives at altitudes of 1700 to 3200 meters. In terms of plant sociology, it is a species of the Salicetea herbaceae class.
swell
- Oskar Angerer, Thomas Muer: Alpine plants (= Ulm nature guide ). Eugen Ulmer, Stuttgart (Hohenheim) 2004, ISBN 3-8001-3374-1 .
- Manfred A. Fischer, Wolfgang Adler, Karl Oswald: Excursion flora for Austria, Liechtenstein and South Tyrol . 2nd, improved and enlarged edition. State of Upper Austria, Biology Center of the Upper Austrian State Museums, Linz 2005, ISBN 3-85474-140-5 .
Web links
- Two-flowered sandwort. In: FloraWeb.de.
- Distribution map for Germany. In: Floraweb .
- Arenaria biflora L. In: Info Flora , the national data and information center for Swiss flora . Retrieved October 13, 2015.
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
Individual evidence
- ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Page 384. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5