Echinacea serotina (Narrow-leaved purple coneflower or blacksamson echinacea) is a North American plant species in sunflower family. It is native to the States of Arkansas and Louisiana in the United States. The species is sometimes listed as being found only in Louisiana, but the type collection was made in Arkansas, part of Louisiana at the time. Echinacea serotina is very similar to E. purpurea but with stiffer, bristly hairs on the foliage.