The other species of blue-eyed grass found here is Sisyrinchium exile and its....YELLOW...go figure!
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David/ Tropical Texana
Click on image for the MACRO.....there's a fine line of purple that edges the yellow. Do you see it?
Another species? This was growing along White Oak Bayou.
This is a pale blue Sisyrinchium, perhaps S. campestre. They sow wildflowers along the bayou and this could be anything.