Echinacea

There are nine known species of echinacea, all of which are native to the United States and southern Canada. The most commonly used, Echinacea purpurea, is believed to be the most potent.
Common Names—echinacea, purple coneflower, coneflower, American coneflower
Latin Names—Echinacea purpurea, Echinacea angustifolia, Echinacea pallida