Auricular rockcress

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Auricular rockcress
Auricular rockcress (Arabis auriculata) in Lower Austria

Auricular rockcress ( Arabis auriculata ) in Lower Austria

Systematics
Eurosiden II
Order : Cruciferous (Brassicales)
Family : Cruciferous vegetables (Brassicaceae)
Tribe : Arabideae
Genre : Goosecress ( Arabis )
Type : Auricular rockcress
Scientific name
Arabis auriculata
Lam.

The auricular rockcress ( Arabis auriculata ) is a species of the cruciferous family (Brassicaceae).

description

Vegetative characteristics

The auricular rockcress is an annual herbaceous plant that usually reaches heights of 10 to 40 centimeters. The basal leaves wither during the main flowering period and there are no rosette side shoots. The plant forms one to a few upright stems . The stem is covered with long stalked hair , always branched with two or more arms . The 5 to 15 stem leaves are more or less hairy and ciliate and have a heart-shaped or arrow-shaped base with two rounded ears that encompass half the stem .

Generative characteristics

The blooming time of the ear rockcress in Central Europe extends from April to mid- May . The flowers have 4 sepals and 4 petals , of which the latter are 2 to 4 millimeters long.

The fruit stalks are shorter than 5 millimeters and about as wide as the fruit. The pods, which are less than 1 millimeter wide and no more than 30 millimeters long, stand upright from one another.

Chromosome number

The species has chromosome number 2n = 16.

ecology

The ear rockcress is a therophyte . The species occurs often in the spring herbaceous fields.

Distribution and occurrence

The ear rockcress is native to almost all of continental Europe except in northern and parts of eastern Europe. It occurs in all countries of the German-speaking area .

In Austria , the auricular rockcress occurs in the Pannonian region scattered, otherwise only very rarely, on gappy dry grass, rocky slopes, embankments and cracks in the colline to submontane elevation . The occurrences are limited to the federal states of Vienna , Lower Austria and Burgenland . The species is considered endangered in the western Alpine region and in the northern Alpine foothills .

The auricular rockcress is a characteristic species of Cerastietum pumili from the Alysso-Sedion association in Central Europe.

photos

  • Spring spring corridor on a dry lawn near Vienna

  • Stems with branched hair

  • Holed stem leaf

  • inflorescence

Individual evidence

  1. ↑ a b c d e Manfred A. Fischer, Karl Oswald, Wolfgang Adler: Excursions flora for Austria, Liechtenstein and South Tyrol . 3rd, improved edition. Province of Upper Austria, Biology Center of the Upper Austrian State Museums, Linz 2008, ISBN 978-3-85474-187-9 , p. 642 .
  2. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Verlag Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3131-5 . Page 466.
  3. ↑ Entry in The Euro + Med PlantBase - the information resource for Euro-Mediterranean plant diversity, accessed on February 2, 2014

Web links

Commons : Ear cress ( Arabis auriculata )  - Collection of images, videos and audio files