Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Iris pseudacorus L. image
Photographer: Paul Drobot           

Botanical Illustration

Richard Bauer

Darrin Kimbler

Kurt Stüber

Paul Drobot

Paul Skawinski

Steve C. Garske

Steve C. Garske

Steve C. Garske

Steve C. Garske
Family Iridaceae
Iris pseudacorus L.
pale-yellow iris, water flag, yellow flag, yellow iris, yellow water flag, yellow water iris
Iris: named for the Greek goddess of the rainbow
pseudacorus: false Acorus, old generic name
Hazardous hazard symbol- click for definition
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - rarely escaped; potentially invasive
Plant: erect, perennial, semi-aquatic, 2'-3' tall forb; stems usually shorter than the leaves; roots densely crowded rhizomes
Flower: yellow, 6-parted, 4" wide, petals much shorter than the sepals; blooms May-June
Leaf:narrow, stiff, erect, sword-like
Habitat: wet; shallows, shores

More Information Natural Communities Herbarium Specimens
All Iris list Ethnobotany Information Google- Images or Text

Flora of North America (off site)
There are no synonyms for this taxon.

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