Blue-Eyed Grass (Sisyrinchium sp)
Wildflowers of Arkansas says "Individual species are very difficult to identify; 8 have been collected in Arkansas." If I had to take a guess, I'd say that this is Prairie Blue-Eyed Grass (Sisyrinchium campestre), but that's just a guess. Mostly, I'll just enjoy this pretty little bright blue flower which isn't actually a grass, but a member of the iris family.
Additonal information on Sisyrinchium campestre:
USDA Plant Profile and Distribution Map
Missouri Flora
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Common (European) Comfrey
(Symphytum officinale)
