|Rudbeckia hirta L.|
(FF + CC20C, SB-140)
UV-Nikkor 105 mm f/4.5, @800 ISO
All images © Bjørn Rørslett/NN
one of the many species called "Black-Eyed
Susan", native to North America and occurring only
adventitious in Norway, has very prominently developed UV
markings on the ray florets.
The inner two third of each ray flower strongly absorbs UV by the presence of flavonyl glucosides secreted by specialised epidermal cells. In the B/W image, it is readily apparent that UV absorbance is quite patchily distributed within the epidermis of the ray floret.
Back to UV Flower Catalogue
Last Update 1 October, 2002