Iris pseudacorus L.  
Family: Iridaceae
pale-yellow iris, water flag, yellow flag, yellow iris, yellow water flag, yellow water iris
Iris pseudacorus image
Steve C. Garske  
Etymology: Iris: named for the Greek goddess of the rainbow
Plants: erect, perennial, semi-aquatic, 2'-3' tall forb; stems usually shorter than the leaves; roots densely crowded rhizomes
Leaves: narrow, stiff, erect, sword-like
Flowers: yellow, 6-parted, 4" wide, petals much shorter than the sepals; blooms May-June
Fruits: capsule
Habitat: wet; shallows, shores
Hazardous: Careful, this plant is hazardous!
Conservation Status: Introduced - rarely escaped; potentially invasive
Iris pseudacorus image
Paul Drobot  
Iris pseudacorus image
Paul Drobot  
Iris pseudacorus image
Richard Bauer  
Iris pseudacorus image
Steve C. Garske  
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