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Centaurea nigra [Common Knapweed]


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Rørslett, B. 2013 Centaurea nigra L. (Asteraceae). Common Knapweed. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...ommon-knapweed/

 

Centaurea nigra L.

NO: Svartknoppurt

SE: Svartklint

DK: Sorthoved-Knopurt

FI: Mustakaunokki

DE: Schwarze Flockenblume

EN: Common Knapweed

 

This is a medium tall, upo to 0.6 m, perennial species native to Europe. It is quite common in coastal areas and occur on meadows, road verges, and similar open habitats. Flowering is June to July and the purplish red flower heads are eagerly visited by winged pollinators.

 

Plants collected and photographed at Tvedestrand, Southern Norway 10 July 2006.

 

CENT_NIG_I0607101097_VIS.jpg

Image reference: CENT_NIG_I0607101097_VIS.jpg

Visible light: Nikon D2X, Micro-Nikkor 105 mm f/2.8 lens, daylight

 

CENT_NIG_I0607101927_UV.jpg

Image reference: CENT_NIG_I0607101927_UV.jpg

Ultraviolet light: Nikon D200, UV_Nikkor 105 mm f/4.5 lens, Baader U filter, SB-140 flash.

 

The disc flowers of C.nigra are moderately UV-reflective.

 

References:

http://www.ultraviol...ure-references/

 

[Published 26 June 2013]

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