nectar guide

(from the article `coloration`) ...have patterns of yellow, blue, and ultraviolet (see photograph) that evoke a strong response in the insect eye. They usually have a darkly ...
Found on http://www.britannica.com/eb/a-z/n/21

Nectar guide

color marks on flowers believed to direct insects to nectar sources.
Found on http://www.encyclo.co.uk/local/21030

Nectar guide

color marks on flowers believed to direct insects to nectar sources.
Found on http://www.betterbee.com/Glossary

Nectar guide

A streak on a flower that guides insects to nectar sources.
Found on http://www.ag.auburn.edu/enpl/courses/glossary.htm

nectar guide

Markings, usually lines or lines of dots, on petals or the labellum which lead a pollinator to nectar.
Found on http://www.anbg.gov.au/cpbr/cd-keys/orchidkey/html/glossary.html
No exact match found