Dwarf yarrow
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Dwarf yarrow ( Achillea nana ) |
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The dwarf yarrow ( Achillea nana ) is a plant from the genus of yarrow ( Achillea ) in the family of Compositae (Asteraceae).
The common names Falscher Genepi, Falscher Genipi, Schwarzrauch, Unser Frauen Schwarzrauch and Wildmännlichrut ( Graubünden near Davos ) are only used regionally .
description
The dwarf yarrow is a perennial herbaceous plant that grows like a cushion and reaches heights of 5 to 10 centimeters. The above-ground parts of the plant are dense, finely covered with woolly, white hairs ( trichomes ). The alternately arranged leaves are pinnate and about four to eight times as long as they are wide. On both sides of the leaf spindle there are six to twelve about 1 millimeter wide, undivided or two to five-toothed leaf lobes.
The flowering period extends from July to August. In a hemispherical total inflorescence there are 5 to 20 cup-shaped partial inflorescences. The basket shell (involucre) is about 5 millimeters high. The flower heads are 6 to 10 millimeters in diameter and contain only six to eight white ray florets . The achenes have a length of about 2 to 2.5 millimeters. There is no pappus .
The number of chromosomes is 2n = 18.
Occurrence
The dwarf yarrow occurs mainly in the western Alps . You can find them in France, Italy, Switzerland and Austria, but not in Germany. It thrives in snow-damp, base-rich slate debris flats at the alpine and nival levels. It is a character species of the Campanulo-Saxifragetum from the Drabion hoppeanae association, but it also occurs in societies of the Androsacion alpinae association.
Individual evidence
- ^ Carl Jessen : The German folk names of plants , published by Philipp Cohen Hanover 1882, page 7.
- ↑ a b Information on dwarf yarrow on infoflora.ch with information from Flora Helvetica .
- ↑ 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. 934 .
Web links
- Achillea nana L. In: Info Flora , the national data and information center for Swiss flora . Retrieved May 8, 2016.
- Photo of the herbarium evidence : Dwarf yarrow in the herbarium, Lower Saxony State Library (Link)