Tree poppy, also known as yellow poppy or California poppy, is a flowering plant that belongs to the poppy family. The scientific name for this plant is Eschscholzia californica. While tree poppy is the most commonly used name for this species, there are several other synonyms that can be used. Some of these include golden poppy, cup of gold, flame flower, and California sunlight. The tree poppy is known for its vibrant yellow, orange, and gold flowers that bloom in the spring and summer months. It is commonly found in California and other western states in the United States.