| yellowflag iris | USDA PLANTS Symbol: IRPS U.S. Nativity: Exotic Habit: Forbs/Herbs |
| Iris pseudacorus L. |
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Taxonomic Rank: Liliopsida: Liliales: Iridaceae |
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| Synonym(s): paleyellow iris | |
| Native Range: western Asia, North Africa; western Europe, N. Africa (BAIL); | |
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
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| 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 |
| EDDMapS Distribution: This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org |
 State(s) Where Reported invasive. Based on state level agency and organization lists of invasive plants from WeedUS database. |
| U.S. National Parks where reported invasive: |
| Colonial National Historical Park (Virginia) |
