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Brauneria laevigata C.L.Boynton & Beadle 1903. Echinacea purpurea var. laevigata (F.E.Boynton & Beadle ex C.L.Boynton & Beadle) Cronquist. Echinacea laevigata, the smooth purple coneflower, is a federally listed threatened species [3] of plant found in the Piedmont of the eastern United States.
Echinacea sanguinea, the sanguine purple coneflower, is a herbaceous perennial native to open sandy fields and open pine woods and prairies in eastern Texas, southeastern Oklahoma, Louisiana, and southwestern Arkansas. It is the southernmost Echinacea species.