Dense flowered cress

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Dense flowered cress
Lepidium densiflorum (5061053283) .jpg

Dense flowered cress ( Lepidium densiflorum )

Systematics
Rosids
Eurosiden II
Order : Cruciferous (Brassicales)
Family : Cruciferous vegetables (Brassicaceae)
Genre : Cress ( Lepidium )
Type : Dense flowered cress
Scientific name
Lepidium densiflorum
Schrad.

The dense-flowered cress ( Lepidium densiflorum ) is a species of the cress ( Lepidium ) genus within the cruciferous family (Brassicaceae). It is native to temperate North America.

description

The stem is covered with very short, straight hair.
Stems with toothed leaves
Inflorescence, the petals are absent or very short.
Elliptical pod (top and bottom)

The dense-flowered cress grows as an annual herbaceous plant and reaches heights of 10 to 30 centimeters. The stem is branched and hairy fairly densely. The hair is straight. The upper stalk leaves are linear to lanceolate, three-veined, mostly saw-toothed clearly distant, ciliate at the base and papilous at the edge.

The flowering period is between May and July. The flowers are four-fold. Petals are missing. There are two or four stamens.

The fruit cluster is very dense, with 2-3 (-5.5) mm long, diagonally upward, somewhat thick fruit stalks. The pods are 2.5-3 (-4) mm long, round to wide, obovate, deep, but with narrow margins and narrow winged at the front. The stylus is shorter than the border.

The species has chromosome number 2n = 32.

Dense-flowered cress ( Lepidium densiflorum ), herbarium specimen

ecology

The dense cress is a therophyte .

Occurrence

Dense-flowered cress is native to temperate North America , from Canada and the United States to northern Mexico. In Europe it has been naturalized as a neophyte since around 1870 , with Atlantic, Central European and South Scandinavian distribution, especially in areas with little rain. She is also a neophyte in Asia and Argentina.

The dense-flowered cress needs loose, stony-sandy or sandy soil that should not be too poor in nutrients, especially nitrogen, but should generally be poor in humus.

It settles in sandy areas on wasteland, on paths and unpaved loading facilities. Above all, it grows in Central Europe in the area of ​​the larger rivers; there, however, it is often inconsistent. In Central Europe it is a local character species of the Conyzo-Lactucetum from the Sisymbrion association, but also occurs in societies of the Onopordion or Polygonion avicularis associations.

literature

  • 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 .
  • 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 .
  • 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. 2nd expanded edition. Eugen Ulmer, Stuttgart 1993, ISBN 3-8001-3323-7
  • Dietmar Aichele, Heinz-Werner Schwegler: The flowering plants of Central Europe , Franckh-Kosmos-Verlag, 2nd revised edition 1994, Volume 3, ISBN 3 440-08048-X

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Page 444–445. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5
  2. ↑ a b Lepidium in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved July 28, 2017.

Web links

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