NC INVASIVE PLANT COUNCIL
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Yellowflag Iris

​Iris pseudoacorus
Yellow flag iris (Iris pseudacorus) is an herbaceous perennial that can grow up to 3- to 4-feet tall as it invades wetlands. This perennial is native to Europe, Asia, the Middle East, and Northern Africa, but has become naturalized in much of North America, especially in the eastern United States. Yellow flag iris is found in wet soils, usually forming large colonies along streams, ponds, and marshes eventually displacing native vegetation.

​The rhizomes and seeds of this aquatic species can be transported downstream, further spreading the plant. Despite its wetland preference, yellow flag iris rhizomes can survive periods of severe drought. The showy, typically yellow flowers bloom from April to June and unlike other iris species, are beardless. Flowers are on erect peduncles with several occurring per stem. Sepals often have purple, brown, or red veins on their yellow surface. The leaves are broad, stiff, erect, glaucous (grayish-green or blue color), and sword-shaped. Seeds of this plant contain glycosides, which are toxic to grazing animals. Caution should be used when handling this plant because it has been known to cause skin irritation.  Yellow flag iris has been observed in the Mountains, Piedmont, and Coastal Plain of North Carolina. 
Fact Sheet: Yellowflag Iris
Picture
Photo Credit: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Picture
Photo Credit: USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org
Picture
Photo Credit: Nancy Loewenstein, Auburn University, Bugwood.org
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  • Home
  • About
    • Donate
    • Invasives 101
    • Membership
    • Board of Directors >
      • NC-IPC ByLaws
    • Contact
    • Listserve
  • News
    • Iverson Scholarship
    • Wildland Weeds Magazine
    • Calendar >
      • 2018 Workshop
  • NC Invasive Plants
    • Ailanthus Altissima (Tree-of-Heaven)
    • Elaeagnus umbellata (Autumn Olive)
    • Ficaria verna (Fig Buttercup)
    • Imperata cylindrica (Cogongrass)
    • Ligustrum sinense (Chinese Privet)
    • Ligustrum vulgare (Wild Privet)
    • Lonicera japonica (Japanese Honeysuckle)
    • Microstegium vimineum (Japanese Stilt Grass)
    • Nandina domestica
    • Nymphoides indica (water snowflake)
    • Paulownia tomentosa (Princess Tree)
    • Persicaria perfoliata (Mile-A-Minute Vine)
    • Pueraria montana (Kudzu)
    • Pyrus calleryana (Bradford Pear)
  • Annual Symposiums
    • 2022 Joint Symposium >
      • 2022 Speaker Presentations
    • 2021 Virtual Conference
    • 2019 Joint Symposium >
      • 2019 Presentations
    • 2018 Annual Symposium
    • 2017 Annual Symposium
    • 2016 Annual Symposium >
      • 2016 agenda
    • 2015 Annual Symposium >
      • 2015 Presentations
      • 2015 Agenda
  • Projects
    • Fig Buttercup Project
    • Eno River Hydrilla Project
    • Awareness Week
  • Awards
    • 2015 Student Competition Winners
    • 2015 EIA Award
    • 2014 EIA Award