One of our native irises, Blue-Eyed Grass (Sisyrinchium atlanticum). Very tough, very perennial, very cheery.
From the comments: Given where I found it I probably don't have sufficient soil moisture for it at my place. Mores the pity.
It's been my experience that B-EG is very drought tolerant, thriving on neglect. I had a bunch of these in a ceramic pot, outside of irrigation, during the driest summer EVER in Central Florida, and they came through unscathed. Under irrigation, they spread quickly and are easily transplanted.