Its petals are yellow on both sides, with the exception of dark purple nectar guides on the front of the lower three petals.

A yellow nectar guide extends along the lower lip.

These may reflect ultraviolet light, and mimic the pattern seen in many flowers known as nectar guides.

Flowers are yellow (or pale salmon pink) with yellow nectar guides.

For Nuttall's violet the only purple coloring is the nectar guides in the throat of the flower.

Bee pollination Bee-pollinated flowers tend to be yellow or blue, often with ultraviolet nectar guides and scent.

Some bee flowers tend to be yellow or blue, often with ultraviolet nectar guides and scent.

The flowers have simple nectar guides with the nectaries usually hidden in narrow tubes or spurs, reached by the long tongue of the butterflies.

Some flowers have patterns, called nectar guides, that show pollinators where to look for nectar.

Flowers are yellow with deep yellow nectar guides.