Iris giganticaerulea (Giant Blue Iris or Giant Blue Flag) is a species of iris native to Alabama, Louisiana and Mississippi in the United States.

The plant has 4-6 basal leaves which are 100-130 cm long and 2-3 cm wide. The flowers are typically blue to purple-blue and appear in spring. Lavender and white colour forms are also observed in the wild.

It was declared as the official state wildflower of Louisiana in 1990.

References

• Flora of North America: Iris giganticaerulea
• Louisiana Laws: RS 49:154.1 - State wildflower
• Iris giganticaerulea Small (Giant blue iris)

Iridaceae | Flora of Alabama | Flora of Louisiana | Flora of Mississippi