Ultraviolet Flowers

Potentilla fruticosa L.
Potentilla fruticosa. Visible light
Visible light
(L37C filter)
Potentilla fruticosa. Ultraviolet light
UV light
(FF + CC20C, SB-140)
Nikon D1H, UV-Nikkor 105 mm f/4.5, @800 ISO

Both images © Bjørn Rørslett/NN

A large-flowered shrub with bright yellow flowers and no detectable UV pattern of its flowers. I guess you could, by a stretch of imagination, designate this the ultimate end point of UV mark development. Here the UV-absorbing zone, typically found in the centre of the flower, has extended all over the flower. Since the flower thus displays a low UV differential reflectance to the foliage, it is hard to envision the usefulness of this for attracting pollinators, unless their colour perception ranges wll into the visible bands. In that case they will perceive thse flowers having a "UV negative" or complementary colour, perhaps if UV is perceived "blue" the complementary colour is "yellow"?

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Last Update 29 July, 2004