Sisyrinchium angustifolium, commonly known as Stout blue-eyed grass or simply blue-eyed grass, 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.
Height: 15–50 centimetres (6–20 in). Stem: broadly winged, 2–4 millimetres (0.08–0.16 in) wide, usually branched. Leaves: 2–6 millimetres (0.08–0.24 in) wide. Tepals: 6, blue, 7–10 millimetres (0.3–0.4 in), each tipped with a sharp point, veined, and darkening toward central yellow patch.
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- Flora of North America
- Rhoads, Ann F., Timothy A. Block, and Anna Anisko (Illustrator). The Plants of Pennsylvania: An Illustrated Manual, Second edition (2007). University of Pennsylvania Press. ISBN 0-8122-4003-0
- Gleason, Henry A. and Cronquist, Arthur (1991) Manual of Vascular Plants of Northeastern United States and Adjacent Canada, Second Edition. The New York Botanical Garden Press. ISBN 0-89327-365-1.
- Thierer, John W., Niering, William A., and Olmstead, Nancy C. (2001) National Audubon Society Field Guide to North American Wildflowers, Eastern Region, Revised Edition. Alfred A. Knopf. ISBN 0-375-40232-2.
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