One feature of a flower that is trying to attract the hummingbird moth as a pollinator would be a strong, sweet odor. The ability of the flower to allow the moth to remain suspended in the air in front of it and accommodate the moth's unique tongue structure would also be important.
Flowers would be more reproductively successful if they adapted to more than just the needs of one pollinator, such as the hummingbird moth. By catering to a variety of pollinators, the flower would increase its chances of being successfully pollinated and ensuring reproduction. This diversity in pollinator adaptation would lead to a more resilient and successful plant population.