A true annual is a plant that completes its life cycle in one year. This means it goes from seed to flower and back to seed and then dies off, during the course of one growing season. That’s what differentiates it from a biennial, which lives for two years, and a perennial plant that is supposed to live for three or more years.
Some of the plants listed under wildflowers are also annuals. In addition, some annuals are perennials in warmer climates such as mums and dahlias. There are many different kinds of annual flowers. A few are pictured here for your review. However, the best resource for identifying trees is with a field guide.
Ageratum
Cleome
Cosmos
Below is a list of field guides that would be very helpful to identify your annual plants.
Marigolds
Dahlia
Mums
Nasturtium
Pansy
Petunia
Sweet Pea
Sunflower
Verbena