Ultraviolet Flowers

Caltha palustris L.

Caltha palustris. Visible light

Visible light
Nikon D1H , UV-Nikkor 105 mm f/4.5, no flash

Caltha palustris. UV light

UV light
Nikon D1H , UV-Nikkor 105 mm f/4.5 @800 ISO, Hoya U-360, SB-140
Both images
© Bjørn Rørslett/NN
Marsh Marigold, a spring species typically blooming in early May in Norway, is remarkable by the very large and prominent UV marks of its flower.

In common with other spring-flowering species, such as Hepatica nobilis, in this family, C. palustris exhibits quite strong reflectance in near-IR, in particular within the central area of the flower. Together with the bowl-shaped petals, this might be a feature literally giving a "hot-spot" within the flower and thus making it attractive to visiting insects.

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Last Update 16 May, 2003