Symphyotrichum puniceum (formerly Aster puniceus), is a species of flowering plant in the family Asteraceae native to eastern North America. It is commonly known as purplestem aster, red-stalk aster, red-stemmed aster, red-stem aster, and swamp aster. It also has been called early purple aster, cocash, swanweed, and meadow scabish.

Its range extends from the edges of the Great Plains to the Atlantic coast, and from the Gulf coast of Texas north to southern Ungava Bay in the north of Quebec. It is adventive in Europe.

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