I think this is Blue-eyed grass (Sisyrinchium angustifolium). I photographed that species last year on campus — http://365project.org/rhoing/365/2013-05-16 — but this specimen is from our back yard garden. Another “true” macro shot.
From the Missouri Botanical Garden, http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=i870 » “It is native to Missouri where it occurs in damp open woods, slopes and along stream banks throughout much of the State. It is a clump-forming perennial that features a tuft of narrow grass-like leaves (to 3/16" wide) typically growing to 12" (less frequently to 20") tall. Clusters of violet-blue flowers (to 1/2" across), each with 6 pointed tepals and a yellow eye, appear in spring on stalks growing from leaf-like bracts atop usually branched flowering stems which are distinctively flattened.”
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...