nfoto Posted December 19, 2012 Share Posted December 19, 2012 Rørslett, B. 2012. Sinapis arvensis L. (Brassicaceae). Charlock. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...sis-l-charlock/ Sinapis arvensis L. NO: Åkersennep SE: Åkersenap DK: Ager-Senep FI: Rikkasinappi IS: Akurmustarðu DE: Acker-Senf EN: Charlock A common weed on roadsides and disturbed soils, Charlock is native to Europe and introduced to North America. It flowers in June and July. The quite large flowers by Crucifer standards show very distinct UV marks near the base of the petals. Style, anthers, buds, and upper stems all are very dark under UV light. A broad range of pollinators can be obserrved visiting these flowers. Specimen collected near Oslo, Norway 4. Aug, 2012. Image reference: SINA_ARV_B1208042782_VIS.jpg Visible light: Nikon D300, Medical-Nikkor 120 mm f/4 lens, built-in ring flash Image reference: SINA_ARV_I1208040146_UV.jpg Ultraviolet light: Panasonic GH-2, Coastal APO 60 mm f/4 lens, Baader U 2" (Venus) filter, SB-140 flash. It is noteworthy that this species, like some other Crucifers, show distinct UV marks also on the lower side of the petals. Veins are in particular prominent on both sides of the petals. [Published: 26 Dec 2012. Last updated: 18 Jan 2013] Link to comment
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