The symbiotic relationship that hummingbirds have with nectar producing plants is unique. North America alone has more than 200 nectar producing species that are pollinated by insects, birds and bees. Of those 150 species depend of hummingbirds for dispersion of their pollen. Add Central and America and the number flower species climbs into the thousands. Without this pollination, the flower species would die out.
Unlike bees, hummingbirds cannot smell. They spot their targets by the vibrant colors, so flower species that depend on the hummingbirds are usually bright colored reds, oranges, pinks, yellows and purples. Many of the flowers have adapted to specific hummingbirds. There is even one type of heliconia that only will be pollinated by two species of hummingbirds. Many blossoms hang downwards, making them ideal for the hummingbirds and suited to the way they hover.