Eurybia paludosa, commonly known as the southern swamp aster, is an herbaceous perennial in the family Asteraceae.

Its flower heads emerge in the late summer through fall and show deep lavender to purple rays with yellow centres.

For example, in North Carolina, where both plants are present E. paludosa occurs along the coastal plain, but E. hemispherica is confined to the mountains.

It is found in wet soils in habitats that include the edges of swamps and pools, moist savannas and low-lying pinelands.

It is also encountered with much less frequency in drier habitats including atop small sand dunes along coastal plains and in open hammocks.