When these start blooming in March, I start looking for the Irises typically nearby — the blue season has begun!
Sisyrinchium angustifolium, commonly known as narrow-leaf 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 cm (6–20 in). Stem: broadly winged, 2–4 mm (1⁄16–3⁄16 in) wide, usually branched. Leaves: 2–6 mm (1⁄16–1⁄4 in) wide. Tepals: 6, blue, 7–10 mm (1⁄4–3⁄8 in), each tipped with a sharp point, veined, and darkening toward central yellow patch.
- "Sisyrinchium angustifolium". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 8 July 2014 – via The Plant List.
- "Sisyrinchium angustifolium". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 1 July 2014.
- Taylor, Ronald J. (1994) . Sagebrush Country: A Wildflower Sanctuary (rev. ed.). Missoula, MT: Mountain Press Pub. Co. p. 72. ISBN 0-87842-280-3. OCLC 25708726.
- Cholewa, Anita F.; Henderson, Douglass M. (2002). "Sisyrinchium angustifolium". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 26. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- Rhoads, Ann F.; Block, Timothy A. (2007). The Plants of Pennsylvania: An Illustrated Manual. Anna Anisko (Illustrator) (2nd ed.). University of Pennsylvania Press. ISBN 978-0-8122-4003-0.
- Gleason, Henry A.; Cronquist, Arthur (1991). Manual of Vascular Plants of Northeastern United States and Adjacent Canada (2nd ed.). The New York Botanical Garden Press. ISBN 0-89327-365-1.
- Thierer, John W.; Niering, William A.; Olmstead, Nancy C. (2001). National Audubon Society Field Guide to North American Wildflowers, Eastern Region (Revised ed.). Alfred A. Knopf. ISBN 0-375-40232-2.