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Echinacea /ˌɛkɨˈneɪʃ(i)ə/[1] is a genus, or group of herbaceous flowering plants in the daisy family, Asteraceae. The Echinacea genus has nine species, which are commonly called coneflower. They are endemic to eastern and central North America, where they are found growing in moist to dry prairies and open wooded areas. They have large, showy heads of composite flowers, blooming from early to late summer. The generic name is derived from the Greek word ἐχῖνος (echino), meaning "sea urchin," due to the spiny central disk. These flowering plants and their parts have different purposes. Some species are cultivated in gardens for their showy flowers, and some are traditionally used to treat and prevent colds, flu, and other infections. Two of the nine species, E. tennesseensis and E. laevigata are listed federally as endangered species.