OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Asparagales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Iris pseudacorus   FAMILY Iridaceae   Go to FSUS key



SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Iris pseudacorus   FAMILY Iridaceae

SYNONYMOUS WITH Flora of North America north of Mexico, vol. 26 (2002)

Iris pseudacorus

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 046-05-005:

Iris pseudacorus   FAMILY Iridaceae

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)

Iris pseudacorus

 

COMMON NAME:
Yellow Flag, Water Flag, Yellow Iris


         To see larger pictures, click or hover over the thumbnails.

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913    pnd_irps_001_lvd

        

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

USDA-NRCS PLANTS Database / USDA Wetland flora: Field office illustrated guide    pnd_irps_008_lvd

        

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10411C

May    Greenville County    SC

Lake Conestee Nature Park

The only completely yellow, large, wild iris in North america, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10415

May    Greenville County    SC

Lake Conestee Nature Park

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10417

May    Greenville County    SC

Lake Conestee Nature Park

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10532C

May    Greenville County    SC

Lake Conestee Nature Park

Once established, can form dense clumps that exclude other wetland species, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10537

May    Greenville County    SC

Lake Conestee Nature Park

The 3 drooping, deep yellow sepals are marked with purple-brown, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10544

May    Greenville County    SC

Lake Conestee Nature Park

The 3 narrow petal-like sections are flattened branches of the style, per The Monthly Illustrator, Vol 4 (Jones, 1895).

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Rob Hunnings    rlh_10547

May    Greenville County    SC

Lake Conestee Nature Park

Sword-like flattened leaves (3/4" wide to 3' long) arise in a fan from base, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).

image of Iris pseudacorus, Yellow Flag, Water Flag, Yellow Iris

Patrick D. McMillan    pdmipseudacorus_lvl

June    Avery County    NC

3 short erect petals, and 3 sepals with broad rounded down-curved tips, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).

 

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Iris pseudacorus   FAMILY Iridaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Iris pseudacorus   FAMILY Iridaceae

SYNONYMOUS WITH Flora of North America north of Mexico, vol. 26
Iris pseudacorus

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 046-05-005:
Iris pseudacorus   FAMILY Iridaceae

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Iris pseudacorus

 

Find by SCIENTIFIC NAME:

763

Forb
Perennial

Habitat: swamps, marshes, streams, ponds, streambanks, tidal wetlands, cultivated as a water plant, per Weakley's Flora

Non-native: Eurasia & Africa

Uncommon (rare in Coastal Plain of GA & SC)

map
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.


INVASIVE

This plant is causing problems in natural areas outside its native range, according to authorities such as:

 

LEAVES:
Simple

FLOWER:
Spring/Summer
Yellow/Cream
Radially symmetrical
3 sepals
3 petals
3 stamens
Inferior ovary
Bisexual

FRUIT:
Summer/Fall
Capsule

 

TO LEARN MORE about this plant, look it up in a good book!



 


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