Distribution: Chiefly west of the Cascades in Washington; southern Vancouver Island, B.C, south to southern California.
Habitat: Wet ground, especially at the edges of lakes and bogs, at low to moderate elevations.
Conservation Status: Not of concern
Tufted perennial herbs, the scapose stem unbranched, flattened and winged, 0.5-4 dm. tall
Leaves narrowly linear, sheathing, attached near the base of the stem, 3-25 cm. long and 2-5 mm. broad.
Flowers 2-7, on slender pedicels 1.5-5 cm. long, subtended by a pair of bracts about the same length as the pedicels; perianth rotate, yellow with deep brownish nerves, the 6 segments alike, nearly distinct, 8-11 mm. long; stamens 3, the filaments fused to each other less than their length; style branches slender, spreading; ovary inferior,.
Capsule 3-celled, oblong-ovoid, 8-12 mm. long.
None of our other species of Sisyrinchium or Olsynium are yellow.