Spectral comparison of Herb Robert (Geranium robertianum) using reflected visible light (top), ultraviolet light (middle), and infrared light (bottom). In ultraviolet light the flower's UV nectar guides) are visible, being darker near the centre of the flower than the edges.
This image is free for you to use and is licensed under the Creative Commons licence CC-BY-SA 3.0. If you use this image please credit Dave Kennard / www.davidkennardphotography.com.
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