The Coreopsis group is one of the great gifts of North America to the plant world. Almost all the species of coreopsis that the world now knows and loves are North American native wildflowers. The following ones are particularly famous, and all these are native over most of the eastern states.

Plains Coreopsis, C. tinctoria, also called Calliopsis, is a much-loved wild annual and is a mainstay of wildflower meadow seed mixtures. (See seed in our Wildlfower Encyclopedia)
Lanceleaf Coreopsis and Large-flowered Coreopsis, C. lanceolata and C. grandiflora are the famous perennial golden daisies that decorate fields over almost the whole east, and west to Missouri and New Mexico. (See seed in our Wildlfower Encyclopedia)
The Rosy Coreopsis, C. rosea is another wild perennial which is finer-leaved than Lanceleaf, and has been hybridized into some of the best new colors and forms.
Thread Leaf Coreopsis C. verticillata is a small delicate-appearing perennial wildflower with fine leaves and stems. This one has been made into many popular garden hybrids, most famous being "Moonbeam", a huge hit when it hit the gardening market.

Since these wonderful plants are North American natives, their hybrids are right at home in your perennial gardens.