BugwoodWiki Article

yellow iris
Iris pseudacorus L.

Overview

Appearance
Iris pseudacorus is a herbaceous perennial that can grow up to 3-4 ft. (0.9-1.2 m) in height.
Foliage
Broad, sword-shaped leaves are stiff, erect and glaucous. They measure between 1.6-3.3 ft. (0.5-1 m) long and 0.4-1.2 in. (1-3 cm) wide. Rhizomes are pink-fleshed and 0.4-1.6 in. (1-4 cm) in diameter.
Flowers
Flowers are showy and bloom from April to June. Usually yellow, their color can range from nearly white to cream. Flowers are 2.75-3.5 in. (7-9 cm) wide. They are borne on erect peduncles with several flowers per stem. There are six perianth clawed segments. Three of these are upward-pointing petals and three are down-ward spreading sepals. Sepals often have purple, brown or red veins on their yellow surface.
Fruit
Fruits are 1.6-2.7 in. (4-8 cm) long capsules. The capsules are 6-angled and cylindric-prismatic to ellipsoid. The average capsule contains about 120 white seeds that harden and turn brown as they mature.
Ecological Threat
It forms large clonal colonies displacing native species. The rhizomes are able to survive heavy droughts. Rhizomes and seeds can be transported downstream, further spreading the plant. Seeds can germinate even after a wetland area burns. It contains glycosides, making it toxic to grazing animals. No birds are known to disperse the seeds of this plant. Caution should be used when hand-pulling, as it can cause skin irritation.

Resources

Selected Images


5207006
5207006

yellow iris
Iris pseudacorus
Plant(s)
Todd Pfeiffer
5207010
5207010

yellow iris
Iris pseudacorus
Flower(s)
Nancy Loewenstein
5207014
5207014

yellow iris
Iris pseudacorus
Flower(s)
Nancy Loewenstein
5387429
5387429

yellow iris
Iris pseudacorus
Fruit(s)
Joseph M. DiTomaso
5272045
5272045

yellow iris
Iris pseudacorus
Flower(s)
Leslie J. Mehrhoff
5207012
5207012

yellow iris
Iris pseudacorus
Flower(s)
Nancy Loewenstein
5272047
5272047

yellow iris
Iris pseudacorus
Fruit(s)
Leslie J. Mehrhoff
5207008
5207008

yellow iris
Iris pseudacorus
Plant(s)
Nancy Loewenstein
5207015
5207015

yellow iris
Iris pseudacorus
Plant(s)
Nancy Loewenstein
5272046
5272046

yellow iris
Iris pseudacorus
Infestation
Leslie J. Mehrhoff
5453125
5453125

yellow iris
Iris pseudacorus
Seed(s)
Leslie J. Mehrhoff
5307069
5307069

yellow iris
Iris pseudacorus
Seed(s)
Steve Hurst
5272048
5272048

yellow iris
Iris pseudacorus
Root(s)
Leslie J. Mehrhoff
5387430
5387430

yellow iris
Iris pseudacorus
Root(s)
Joseph M. DiTomaso
5453147
5453147

yellow iris
Iris pseudacorus
Plant(s)
Leslie J. Mehrhoff
5307067
5307067

yellow iris
Iris pseudacorus
Plant(s)
USDA PLANTS Database
5307068
5307068

yellow iris
Iris pseudacorus
Plant(s)
USDA PLANTS Database

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Invasive Listing Sources

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Liliopsida
Subclass: Liliidae
Order: Liliales
Family: Iridaceae
Genus: Iris

Other System Links

Plants: IRPS
Bayer: IRIPS
GRIN: 20385
ITIS: 43194
NPDN Pest: PCJABBB
NPDN Host: 41032

Synonyms and Other Names

Other Common Names:
paleyellow iris

Categories

Category: Aquatic
Category: Forbs/Herbs