Hummingbirds as well as most other types of birds have no sense of smell. Does this surprise you? As a result, hummingbirds are drawn to plants that have a high visibility. Hybrid plants often have far less nectar output then plants that were grown in the wild.
If you are looking for various trees and shrubs that will attract the hummingbirds to your yard then I would like to suggest the following: Azalea, Butterfly bush and Lantana. Why those you ask? They are some of my favorites that my mom always had planted in our yard which was always full of hummingbirds. Therefore, each time I see them it reminds me of my mom as well as offering me the hope that there may even be some hummingbirds in the area.
Whatever you choose to plant in order to attract the hummingbirds, it is important to remember that it should have a high visability and a high nectar production. To find out what is best for your area of the country, please check with your local nursery who can guide you and help you make wise selections.