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

Nectar guides are markings or patterns seen in flowers of some angiosperm species, that guide pollinators to their rewards. Rewards commonly take the form of nectar, pollen, or both, but various plants produce oil, resins, scents, or waxes. Such patterns also are known as `pollen guides` and `honey guides`, though some authorities argue for th...
Found on http://en.wikipedia.org/wiki/Nectar_guide

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