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Galium mollugo [Whorled Bedstraw]


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#1 Andrea B.

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Posted 26 March 2015 - 19:01

Blum, A. G. (2015) Galium mollugo L. (Rubiaceae) Whorled Bedstraw. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...orled-bedstraw/

Southwest Food Mart, Southwest Harbor, Maine, USA
08 July 2014
Wildflower

Synonyms:
  • Wild Madder
  • Smooth Bedstraw
  • White Bedstraw
  • Hedge Bedstraw
Comment:
Fluffy, fragrant clouds of yellow-budded, white-flowered G. mollugo are everywhere for a while in July.
The tiny flowers are very UV-absorbing with a bit of iridescence.

Reference:
1. New England Wild Flower Society (2014) Galium mollugo L. Whorled Bedstraw. https://gobotany.new...galium/mollugo/

Visible Light [f/9 for 1/1000" @ ISO-400 with Nikon Df + Nikon 60mm f/2.8G Micro-Nikkor]
Attached Image: galliumMollugo_070814swFoodMartSwhME_5536origpnCompSqCrop.jpg


Equipment [Nikon D600-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]
for the next four photos

Visible Light [f/11 for 1.3" @ ISO-400 with onboard Flash and Baader UVIR-Block Filter]
Attached Image: galiumMollugoVisFlash_070914swFoodMartSwhME_20331pnPf.jpg

Ultraviolet Light [f/11 for 25" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
A very long exposure was taken to fire the UV-flash three times.
Attached Image: galiumMollugoUVBaadSB14_070914swFoodMartSwhME_20337pnPf01.jpg

Visible Light [Rotated, unresized crop from the preceding photo.]
The textured surface of the tiny petals is evident under UV light.
Attached Image: galiumMollugoUVBaadSB14_070914swFoodMartSwhME_20337pnCrop100.jpg

UV-Induced Visible Fluorescence [f/16 for 21/xxx" @ ISO-100. Nichia 365 UV-Led, unfiltered. Lens + Baader UVIR-Block Filter. Photographed in Semi-darkness.]
The anthers and pollen are visibly fluorescent under UV light. The petals are reflecting a bit of blue light leaked from the UV-Led. These colours are unprofiled and may not be quite accurate.
Attached Image: galiumMollugoUVIVisFluor_070814swFoodMartSwhME_19995pf.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.