Sisyrinchium campestre E. P. Bicknell

Herbs, perennial, cespitose, light green to olive or ashy olive, sometimes with purplish base when dry, to 4 dm, not glaucous. Stems simple, 1.2–2.5 mm wide, glabrous or scabrous, margins usually entire, similar in color and texture to stem body. Leaf blades usually glabrous, bases occasionally becoming fibrous but not persistent in tufts. Inflorescences borne singly; spathes green to purplish, glabrous or scabrous, keels usually entire; outer 22–50 mm, 10–32 mm longer than inner, tapering evenly towards apex or occasionally slightly constricted proximal to apex, margins distinct or rarely connate basally to 1 mm; inner with keel usually gibbous, hyaline margins 0.1–0.3 mm wide, apex acuminate to acute, ending 0.4–3.5 mm proximal to green apex. Flowers: tepals white to pale blue, bases yellow; outer tepals 7–12.7 mm, apex rounded to emarginate, aristate; filaments connate ± entirely, stipitate-glandular basally; ovary similar in color to foliage. Capsules light to dark brown, globose, 3–5 mm; pedicel spreading to ascending. Seeds globose to obconic, lacking obvious depression, 0.5–1 mm, granular to rugulose. 2n = 32.

Man.; Ark., Ill., Ind., Iowa, Kans., La., Mich., Minn., Mo., Nebr., N.Dak., Ohio, Okla., S.Dak., Tex., Wis.

Flowering spring--early summer.

Prairies, meadows, roadsides; 20--500m.

Sisyrinchium campestre var. kansanum E. P. Bicknell; S. flaviflorum E. P. Bicknell; S. kansanum (E. P. Bicknell) Alexander

Prairie blue-eyed grass blooming with wood betony at Crex Meadows in Wisconsin

Sisyrinchium campestre, the prairie blue-eyed grass or white-eyed grass, is a small herbaceous perennial plant in the iris family, native to prairie and meadow in the central United States and in extreme southern Manitoba.

Prairie blue-eyed grass is one of the more drought tolerant species in the genus. It blooms in late spring and early summer for about three weeks. The flowers are white to pale blue, with yellow centers. They have six tepals 7 to 12.7 mm (0.28 to 0.50 in) long that have rounded ends with a sharp point in the center. The flowers are borne on slender pedicels (stems) in an umbel enclosed in two bracts at the top of an unbranched flat stem. The leaves are grass-like, 3 to 10 inches (8 to 25 cm) long and 2 to 3 mm (0.08 to 0.12 in) across, and the flower stem is about as long as or a little longer than the leaves. The root system is coarse and fibrous. A plant produces offsets and forms a dense clump over time.

Sisyrinchium campestre là một loài thực vật có hoa trong họ Diên vĩ. Loài này được E.P.Bicknell miêu tả khoa học đầu tiên năm 1899.