**ECHINACEA: Benefits, Side Effects, Uses, Dosage, Warnings?** Common name : purple coneflower. Botanical names : Echinacea angustifolia, E. pallida, E. purpurea , family Asteraceae. English names : Echinacea, American cone flower, snakeroot . Parts used : roots ( E. pallida, E. angustifolia, E. purpurea ) and ... . Some evidence suggests that among the many forms in which echinacea is available, liquid or tablet form to let melt in the mouth would be most effective.