How do colour and fragrance help Sapindales flowers attract insect pollinators?

In the plant order Sapindales, flowers utilize both visual and chemical signals to attract insect pollinators, which are essential for their reproductive success.1

• Visual Attraction: Many flowers in this order feature coloured petals and sometimes stamens, which serve as conspicuous "advertisements" to attract insects. These visual cues help pollinators locate the flowers, often signaling the presence of nectar secreted by a disk located at the base of the pistil.1
• Fragrance: For other species within the order, fragrance is the primary mechanism used to draw insects to the flower. These scents are typically composed of complex blends of volatile compounds that insects detect using specialized receptor cells on their antennae.12

By combining these sensory signals with nectar rewards, Sapindales flowers effectively increase their chances of attracting pollinators, thereby facilitating pollination and promoting outbreeding.1