Nectar guide

Two images comparing the appearance of a Mimulus flower in visible and ultraviolet light
Crab spider (Xysticus sp.) lurking on Marsh Cranesbill (Geranium palustre) with visible nectar guides

Nectar guides are markings or patterns seen in flowers of some angiosperm species, that guide pollinators to their rewards. These markings may appear as lines, spots, or "blotches". Such patterns are also known as "pollen guides" and "honey guides", though some authorities argue for the abandonment of such terms in favour of floral guides (see, for example, Dinkel & Lunau).

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