| yellowflag iris |
USDA PLANTS Symbol: IRPS USDA ARS GRIN: 20385 ITIS: 43194 NAPIS: PCJABBB Bayer code: IRIPS |
| Iris pseudacorus L. | |
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Taxonomic Rank: Liliopsida: Liliales: Iridaceae |
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| Synonym(s): paleyellow iris | |
Yellow flag iris is a perennial plant that occurs in wet areas such as ditches and marshes. Leaves arise from the base of the plant and are flattened, 3-4 ft. (0.9-1.2 m) long with a raised mid-rib. Bright yellow flowers appear in late spring to early summer. Flowers develop in groups of 2-10 and have three drooping, yellow sepals with purple-brown markings and 3 smaller, unmarked and upright yellow petals. Flowers are about 3 in. (7.6 cm) wide. Fruit are brown capsules that are 2 in. (5 cm) long. Yellowflag iris was introduced into the United States in the mid-1800s as an ornamental from Eurasia or Northern Africa. Plants can withstand a wide variety of conditions, including brackish water, acidic water and periods of drought. |
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Identification, Biology, Control and Management Resources
- Weed of the Week - USDA Forest Service
- Element Stewardship Abstract - The Nature Conservancy
- Invasive Plant Atlas of New England - University of Connecticut
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Plant(s); along drainage area Nancy Loewenstein, Auburn University, Bugwood.org Additional Resolutions & Image Usage |
 Root(s); Inside of cut rhizome Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); pale yellow form Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Nancy Loewenstein, Auburn University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Nancy Loewenstein, Auburn University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Nancy Loewenstein, Auburn University, Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); along drainage area Nancy Loewenstein, Auburn University, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Todd Pfeiffer, Klamath County Weed Control, Bugwood.org Additional Resolutions & Image Usage |
 Seed(s); Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
 Diagram or Graphic; USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
 Diagram or Graphic; Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 540. USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
Taxonomic References:
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Invasive Listing Sources:
- Connecticut Department of Environmental Protection
- Delaware Natural Resources and Environmental Control, 2004
- Faith Campbell, 1998
- Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Maryland Department of Natural Resources, 1994
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Native Plant Society of Oregon, 2002
- New Hampshire Invasive Species Committee. 2005. Guide to Invasive Upland Plant Species in New Hampshire. New Hampshire Department of Agriculture, Markets and Food Plant Industry Division and New Hampshire Invasive Species Committee.
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Pacific Northwest Exotic Pest Plant Council, 1998
- Vermont Department of Environmental Conservation
- Virginia Department of Conservation and Recreation, 2009
- WeedUS - Database of Plants Invading Natural Areas in the United States
- California Invasive Plant Council
- Connecticut Noxious Weeds
- Massachusetts Noxious Weeds
- Montana Noxious Weeds
- New Hampshire Noxious Weeds
- Oregon Noxious Weeds
- Tennessee Exotic Pest Plant Council Lesser Threat
- Washington Noxious Weeds
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