Andrea B. Posted June 10, 2015 Share Posted June 10, 2015 Blum, A.G. (2015) More examples of Sonchus arvensis L. (Asteraceae) Field Sowthistle. Flowers photographed in ultraviolet, visible and infrared light. http://www.ultraviol...-more-examples/ Synonyms:Sonchus arvensis L. ssp. uliginosus (Bieb.) NymanSonchus uliginosus Bieb.Comment:S. arvensis has small, rounded "ears", or auricles, which clasp the stem. The most common form in Maine has stipitate glands on peduncles and phyllaries.Rørslett (2012) first showed a Norwegian S. arvensis in ultraviolet(1). Here are other examples found in the US in Maine which also exhibit the UV-dark central area and reflective ray tips. Reference:1. Rørslett, B. (2012) Sonchus asper L. (Asteraceae) Perennial Sow-Thistle. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...al-sow-thistle/2. New England Wild Flower Society (2015) Sonchus arvensis L. Field Sowthistle. https://gobotany.new...nchus/arvensis/ Set 1Clark Point Road, Southwest Harbor, Maine, USA19 July 2014Wildflower Equipment [Nikon D600-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/11 for 1/10" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter]Stipitate glands can be seen on the front protruding stem. Ultraviolet Light [f/11 for 20" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]A long exposure was made so as to include multiple flashes for more even lighting. Visible Light [f/5.6 for 1/640" @ ISO-400 with Nikon V3]S. arvensis has much smaller auricles than do S. asper or S. oleraceus. Set 2Seal Cove, Mount Desert Island, Maine, USA13 July 2010Wildflower Equipment [Nikon D700-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/11 for 1/20" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter] Visible Light [f/9 for 1/2000" @ ISO-400 with Nikon D3S + Nikon 60mm f/2.8G Micro-Nikkor]A Field Sowthistle capitulum gone to seed on the shores of Seal Cove. Ultraviolet Light [f/11 for 2.5" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Infrared Light [f/11 for 1/20" @ ISO-400 with Onboard Flash and B+W 092 IR-Pass Filter] Infrared Light [f/11 for 1/13" @ ISO-400 with Onboard Flash and B+W 093 IR-Pass Filter] Set 3Southwest Harbor, Maine, USA14 July 2010Wildflower Equipment [Nikon D700-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/11 for 1/15" @ ISO-500 with Onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1.3" @ ISO-500 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Infrared Light [f/11 for 1/25" @ ISO-500 with Onboard Flash and B+W 092 IR-Pass Filter] Infrared Light [f/11 for 1/8" @ ISO-500 with Onboard Flash and B+W 093 IR-Pass Filter] Link to comment
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