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
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.

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.

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.

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.

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.

 

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
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

Non-native: Eurasia & Africa

Uncommon (rare in Coastal Plain of GA & SC)

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

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

Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)


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
Bisexual
Radially symmetrical
3 sepals
3 petals
3 stamens
Inferior ovary

FRUIT:
Summer/Fall
Capsule

 

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



 


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