Centaurea solstitialis

Solstice Knapweed (Centaurea solstitialis )

The solstice Knapweed (Centaurea solstitialis ) is a plant of the genus Centaurea (Centaurea ).

Features

The solstice knapweed is a summer annual or annual half - wintering rosette plant, which reaches stature heights of 20 to 80 centimeters. The species forms a taproot. The leaves are decurrent and gray felt. The pappus is 3 to 5 millimeters long. He lacks the edge union fruits. The bracts run out in a rough spine. The crown is yellow.

The flowering period extends from July to September. The flowers are pollinated by insects. The seeds are spread by Klebausbreitung, as steppe scooter by wind and spread by humans.

The chromosome number is 2n = 16

Occurrence

The solstice knapweed grows in moderately dry waste places such as debris, roadsides and distribution areas, on clover and Luzerneäckern and field margins. The species is base hold. In Germany, the species since 1830 occurs as unstable neophyte.

Documents

• Eckhart J. Jäger, Klaus Werner ( eds.): Rothmaler Exkursionsflora of Germany. Volume 4: Vascular Plants: Critical band. Spektrum Akademischer Verlag, Munich 2005, ISBN 3-8274-1496-2.