Sisyrinchium angustifolium, commonly known as narrow-leaf blue-eyed-grass,[3] is a herbaceous perennial growing from rhizomes, native to moist meadow and open woodland.

It is the most common blue-eyed grass of the eastern United States, and is also cultivated as an ornamental.

Range: Eastern Canada and US, west to Texas and Minnesota, in meadows, low woods, and shorelines.

Stem: broadly winged, 2–4 mm (1⁄16–3⁄16 in) wide, usually branched.

Tepals: 6, blue,[4] 7–10 mm (1⁄4–3⁄8 in), each tipped with a sharp point, veined, and darkening toward central yellow patch.