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UltravioletPhotography

Sonchus arvensis [Field Sowthistle]: More Examples


Andrea B.

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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.) Nyman
  • Sonchus 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 1

Clark Point Road, Southwest Harbor, Maine, USA

19 July 2014

Wildflower

 

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.

sonchusArvensis_071914clarkPtRdCoveSwhME_23214pnPf.jpg

 

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.

sonchusArvensis_071914clarkPtRdCoveSwhME_23222pnPf.jpg

 

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.

sonchusArvensisLeaf_071614clarkPtRdCoveSwhME_3045pf.jpg

 

 

Set 2

Seal Cove, Mount Desert Island, Maine, USA

13 July 2010

Wildflower

 

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]

sonchusArvensisVisFlash071310sealCoveME_5467origpn.jpg

 

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.

sonchusArvensisSeedheadVis071210sealCoveME_10091orig.jpg

 

Ultraviolet Light [f/11 for 2.5" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

sonchusArvensis365UV071310sealCoveME_5473pf.jpg

 

Infrared Light [f/11 for 1/20" @ ISO-400 with Onboard Flash and B+W 092 IR-Pass Filter]

sonchusArvensis092IRFlash071310sealCoveME_5481pf.jpg

 

Infrared Light [f/11 for 1/13" @ ISO-400 with Onboard Flash and B+W 093 IR-Pass Filter]

sonchusArvensis093IRFlash071310sealCoveME_5476origpn.jpg

 

Set 3

Southwest Harbor, Maine, USA

14 July 2010

Wildflower

 

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]

sonchusArvensisVisFlash071410swhME_5647pnPf.jpg

 

Ultraviolet Light [f/11 for 1.3" @ ISO-500 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

sonchusArvensis365UV071410swhME_5658pnPf.jpg

 

Infrared Light [f/11 for 1/25" @ ISO-500 with Onboard Flash and B+W 092 IR-Pass Filter]

sonchusArvensis092IRVisFlash071410swhME_5664pn.jpg

 

Infrared Light [f/11 for 1/8" @ ISO-500 with Onboard Flash and B+W 093 IR-Pass Filter]

sonchusArvensis093IRVisFlash071410swhME_5667pn.jpg

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