Eaton’s aster (Symphyotrichum bracteolatum) is a medium-sized aster with relatively broad leaves, evenly distributed short hairs on the stem, and white ray flowers.  It is most commonly found along smaller seasonally dry streams at mid to high elevations in the Boise Front.  A few populations from lower elevations are also included in this species, with some possible introgression with marsh aster.

The correct epithet for this species has a complex history, with both eatonii and bracteolatum having their proponents.  In an attempt to retain then-current usage of eatoni, a proposal to reject the basionym Aster bracteolatus (Reveal et al. 2009) was submitted to the International Committee on Nomenclature for Algae, Fungi, and Plants.  However, the proposal was voted down, thereby establishing S. bracteolatum as the currently correct scientific name for Eaton’s aster.

Reveal, J. L., K. L. Chambers, and G. L. Nesom.  2009.  (1880) Proposal to reject the name Aster bracteolatus (Asteraceae).  Taxon 58: 305–306.