File:Common knapweed (Centaurea nigra) - geograph.org.uk - 492672.jpg
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| Description |
English: Common Knapweed Centaurea nigra. A very common perennial of grassy places; about 60 cm in height with blue thistle-like flower heads and narrow-oval leaves. Knapweed is also known as Hardhead because of the hard flower head beneath the petals. The plants where once used as a poultice on wounds and have been used in traditional fabric dyeing. Despite its purple flower, yellow is the most typical colour of dye that it produces. These examples were growing on the roadside verge in well drained soil. |
| Date | |
| Source | From geograph.org.uk |
| Author | Kate Jewell |
| Attribution (required by the license) | Kate Jewell / Common knapweed (Centaurea nigra) / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object location | | View this and other nearby images on: OpenStreetMap | |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Kate Jewell and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Kate Jewell
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 04:37, 5 February 2011 | | 640 × 583 (167 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Common knapweed (Centaurea nigra) A very common pernnial of grassy places; about 2 feet in height with blue thistle-like flower heads and narrow-oval leaves. Knapweed is also known as Hardhead becau |
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