There are three varieties of Echinacea: Echinacea purpurea, Echinacea pallida, and Echinacea angustifolia. All three varieties are commonly used to support a healthy immune system and and maintain an infection free environment. Echinacea is most commonly used for protection and to help shorten the duration of the common cold. It is one of the most popular herbal remedies for respiratory illnesses.