Hollow yolk

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Hollow yolk
Fruiting hollow yolk (Myagrum perfoliatum)

Fruiting hollow yolk ( Myagrum perfoliatum )

Systematics
Eurosiden II
Order : Cruciferous (Brassicales)
Family : Cruciferous vegetables (Brassicaceae)
Tribe : Isatideae
Genre : Myagrum
Type : Hollow yolk
Scientific name of the  genus
Myagrum
L.
Scientific name of the  species
Myagrum perfoliatum
L.

The hollow yolk ( Myagrum perfoliatum ), also known as Pastel or German Indigo , is the only species of the Myagrum plant genus within the cruciferous family (Brassicaceae).

description

The hollow yolk is a deciduous, one to two year old herbaceous plant that reaches heights of 20 to 60 centimeters. It has an unpleasant odor. The upright, blue-green stem is usually sparsely branched in the upper part. The stem leaves are entire or finely serrated and at the base heart-shaped to arrow-shaped stem encompassing. The flowering period is between May and June. The 3 to 4 mm long petals are light yellow. The 5 to 8 mm long, pear-shaped pods stand upright on thickened fruit stalks that lie close to the stem.

The species has chromosome number 2n = 14.

ecology

The hollow yolk is a therophyte .

Occurrence

The natural range of the hollow yolk extends from the Mediterranean region to the east to Iran and southern Russia . From non- Mediterranean Europe north to Norway and Sweden, in North America and Australia , it is a neophyte . The hollow yolk populates in Central Europe in areas with warm summers grain and rapeseed fields, and occasionally also patchy wasteland . It occurs rarely in the Hessian mountains , on the Neckar , on the Danube and in the foothills of the Alps , in western Switzerland , in Lower Austria , in the Vienna basin and at the foot of the Alps ; occasionally, its range extends to Hamburg and Berlin . The hollow yolk is unstable almost everywhere today. Although it was never common in Central Europe, it has been drastically pushed back again by the use of herbicides . The hollow yolk thrives on nutrient-rich , calcareous or calcareous loam soils . It is a character type of the Caucalidion association, but also occurs in societies of the Sisymbrion association.

Systematics

The genus Myagrum was established by Carl von Linné . The generic name Myagrum means flycatcher. The specific epithet perfoliatum means streaky leaves. Myagrum perfoliatum is the only species of the genus Myagrum from the Isatideae tribe within the Brassicaceae family .

literature

  • Otto Schmeil , Jost Fitschen (greeting), Siegmund Seybold: The flora of Germany and the neighboring countries. A book for identifying all wild and frequently cultivated vascular plants. 95th completely revised u. exp. Edition. Quelle & Meyer, Wiebelsheim 2011, ISBN 978-3-494-01498-2 .
  • Henning Haeupler , Thomas Muer: picture atlas of the fern and flowering plants of Germany (= the fern and flowering plants of Germany. Volume 2). 2nd, corrected and enlarged edition. Published by the Federal Agency for Nature Conservation. Ulmer, Stuttgart 2007, ISBN 978-3-8001-4990-2 .
  • Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas. 8th edition, Ulmer-Verlag, 2001, ISBN 3-8001-3131-5 . Page 452.
  • Oskar Sebald, Siegmund Seybold, Georg Philippi (Hrsg.): The fern and flowering plants of Baden-Württemberg. Volume 2: Special part (Spermatophyta, subclass Dilleniidae): Hypericaceae to Primulaceae. Eugen Ulmer, Stuttgart 1990, ISBN 3-8001-3312-1 .
  • Dietmar Aichele, Heinz-Werner Schwegler: The flowering plants of Central Europe. 2nd Edition. Volumes 1–5, Franckh-Kosmos, Stuttgart 2000, ISBN 3-440-08048-X .

Individual evidence

  1. ↑ a b c d hollow yolk. In: FloraWeb.de.
  2. ↑ 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.  452 .
  3. ↑ data sheet with photos.

Web links

Commons : Hohldotter ( Myagrum perfoliatum )  - Collection of images, videos and audio files