Sisyrinchium angustifolium (Narrowleaf Blue Eyed Grass) is a species of perennial herb in the family Iridaceae. They have a self-supporting growth form. They are native to Canada and The Contiguous United States. They have simple, broad leaves and blue flowers. Flowers are visited by Apis mellifera, Ectemnius atriceps, Grapeleaf Skeletonizer, and Myodes glareolus cytomegalovirus 1. Individuals can grow to 0.61 m.
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