Everything about Nectar Guide totally explained
Nectar guides are patterns seen in some
flowers that guide pollinators to the
nectar and
pollen.
These patterns are sometimes visible to humans; for instance, the Dalmatian
toadflax (
Linaria genistifolia) has yellow flowers with orange nectar guides. However, in some plants, such as
sunflowers, they're visible only under
ultraviolet light. Under ultraviolet, the flowers have a darker center, where the nectaries are located, and often specific patterns upon the petals as well. This is believed to make the flowers more attractive to
pollinators such as
honey bees and other
insects that can see ultraviolet.
This page
on butterflies shows an animated comparison of
black-eyed Susan (
Rudbeckia hirta) flowers in visible and UV light.
The ultraviolet color, invisible to humans, has been referred to as
bee violet, and mixtures of ultraviolet with shorter (
yellow) wavelengths are called
bee purple by analogy with
purple in human vision..
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