Eurybia saxicastelli, commonly known as the Rockcastle aster, is an herbaceous perennial native to the south eastern United States.

As a result of its extremely restricted range as well as human alterations to its habitat, it is considered critically imperiled by NatureServe.

The flowers appear in the late summer through fall and have ray florets that are pale blue to pale white and yellow disc florets that turn purplish with age.

It is found primarily growing at the back edge of sandstone river bars composed of boulders and cobbles, along with other shrubby vegetation.

These areas are flooded in the spring, but dry in the summer, making the habitat quite specific.