The native flora of the USA is not as rich in species that we see in South America, but is still varied mainly due to the wide variety of climates and landscapes. These range from a mostly temperate climate with an Arctic climate in Alaska, sub-tropical climate in Florida, and a tropical climate in Hawaii. In addition to the wide range of climates are the varying altitudes within these climates with the western Rocky Mountains, eastern Appalachians, and the steep mountains of Hawaii. Plains are also extensive with arctic plains, prairies, and sub-tropical marshes and swamps in the southern states including the Florida Everglades.
Notable trees that are native or endemic to the USA include Sequoia sempervirens (California Redwood) the tallest living trees on Earth, Oaks, American Elm, and the Banyan Tree of Hawaii.