Comparison image of the flower of a small cactus (possibly a Mammillaria elongata cultivar) photographed in visible light (top), ultraviolet light (middle), and infrared light (bottom).
In visible light the flower has light yellow coloured petals, with light yellow stamens clustered in the centre. The cactus stem is dark green, but is covered with white spines. Around the top of this larger stem bearing the flower are also some longer brown spines.
The flower's appearance in ultraviolet is quite different to that in visible light. The petals appear much darker, making the flower stand out from the white spines covering the cactus. The anthers and pollen also appear much darker in UV. The rest of the cactus appears quite similar to how it appears in visible light, with a dark stem covered in light spines and some darker spines around the flower.
In infrared the cactus and flower appear much the same as they do in visible light, with the exception of the stem. The stem appears much brighter in infrared.
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