Eurybia avita, commonly called Alexander's rock aster, is a rare North American plant species, a herbaceous perennial in the family Asteraceae that was formerly considered part of the genus Aster.

[3] It is of conservation concern as it is found in less than 50 sites, typically only in sandy soils near granite flatrocks, and it is most likely already extirpated in North Carolina.

[4] Eurybia avita is a perennial herb sometimes as much as 80 cm (32 inches) tall, having 1-5 stems and reproducing by means of underground rhizomes.

In South Carolina it is only known from one site in Pickens County, while in Georgia it can be found in 40 to 45 locations.

It is typically found between 100 and 500 metre (350–2800 feet) (elevations growing in shallow and sandy soils around the edges of granite flatrock outcroppings.