Echinacea angustifolia (narrow-leaved purple coneflower or blacksamson echinacea) is a North American plant species in the sunflower family.
It is widespread across much of the Great Plains of central Canada and the central United States, with additional populations in nearby regions.
Echinacea angustifolia blooms late spring to mid summer. It is found growing in dry prairies and barrens with rocky to sandy-clay soils.
Many believe that Echinacea purpurea is inferior to Echinacea angustifolia and therefore less effective. Echinacea angustifolia is certainly more rare and many find it a bit more difficult to grow. The answer to the question of which one to use is basically up to interpretation.