Sisyrinchium angustifolium, commonly known as narrow-leaf blue-eyed-grass, is a herbaceous perennial growing from rhizomes, native to the eastern United States, stretching as far west as Texas and Kansas, where it is the most common blue-eyed grass. It is commonly cultivated as an ornamental.
Height: . Stem: broadly winged, wide, usually branched. Leaves: wide. Tepals: 6, blue, , each tipped with a sharp point, veined, and darkening toward central yellow patch.
S. angustifolium is most commonly found in habitats such as woodlands, meadows, and sandhill swales.
This species possesses an intermediate shade tolerance and is adapted to both fine and medium-textured soils.
S. angustifolium tends to flower from January to May, with peak inflorescence occurring in the spring, around April.