nfoto Posted June 24, 2013 Share Posted June 24, 2013 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: SvartknoppurtSE: SvartklintDK: Sorthoved-KnopurtFI: MustakaunokkiDE: Schwarze FlockenblumeEN: 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. Image reference: CENT_NIG_I0607101097_VIS.jpgVisible light: Nikon D2X, Micro-Nikkor 105 mm f/2.8 lens, daylight Image reference: CENT_NIG_I0607101927_UV.jpgUltraviolet 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] Link to comment
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