Andrea B. Posted January 23, 2014 Share Posted January 23, 2014 Blum, A.G. (2013) A UV Variant Example of Hesperis matronalis L. (Brassicaceae) Dame's Rocket. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...ariant-example/ Seal Cove, Maine, USA17 July 2012Wildflower Comment:Rørslett (2013) first showed Hesperis matronalis in ultraviolet(1). Here is another example found growing along a rocky shore on Mount Desert Island. The pink flowers in this specimen show the same UV-absorbing petals with UV-dark center and throat as in Rørslett's pink flowers, but the white flowers are quite a bit brighter in UV and seem to have a smaller UV-dark central area.Introduced to North America and often cultivated in the garden, Dames' Rocket has become an invasive in many states. Reference:1. Rørslett, B. 2012. Hesperis matronalis L. (Brassicaceae). Dame's Rocket. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...s-dames-rocket/2. Dame's Rocket, Alien Plant Working Group, Plant Conservation Alliance, Bureau of Land Management, Washington, D.C. Equipment [Nikon D300-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/11 for 1/60" @ ISO 200 with onboard Flash and Baader UVIR-Block Filter]Click the photo to view at 1200 pixel width. Ultraviolet Light [f/11 for 1/60" @ ISO 320 with SB-14 UV-modified Flash and Baader UV-Pass Filter]Click the photo to view at 1200 pixel width. Link to comment
nfoto Posted January 24, 2014 Share Posted January 24, 2014 Interestingly, the albino flowers are UV-different from the normal coloured ones. I wonder how widespread this UV response is. The petals of the normal flowers apparently have much larger patches of conical cells on their upper surface. Link to comment
Andrea B. Posted January 24, 2014 Author Share Posted January 24, 2014 It's always a bit difficult to determine the conical cells because one really needs to use a raking light. I think the white flowers were too much facing the light to be able to see conical cells. Also a closer-up would have been better for seeing them methinks. I've seen this variation in UV absorbtion between blue and white flowers in some Anemone blanda - not yet posted. But you have seen it way back when I posted it on NG. I'll try to get that posted later this evening. We need either a tag or a "special" section for this phenomenon so that we can correlate later. Link to comment
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