Flowers small, 6-pointed "stars," variable in size; blue, violet, or white; arising at ends of unbranched stems. There is usually a yellow "eye" at the center of the flower. Blooms April-June. Leaves basal, grasslike, stiff, folded along midrib, upright, pale green.
Similar species: There are 4 species in the genus Sisyrinchium in Missouri, all called "blue-eyed grass," and some are difficult to tell apart. One species, S. atlanticum, is a Coastal Plain plant that lives in Missouri only in our southeastern counties.