Subgenus Limniris is one subgenus of beardless irises, which don't have hairs on their drooping sepals, also called their falls.
Iris subg. Limniris
Louisiana iris is a taxonomic group of five iris species native to Louisiana and surrounding regions of the southeastern United States: Iris fulva, Iris hexagona, Iris brevicaulis, Iris giganticaerulea, and Iris nelsonii.
Louisiana iris
Audubon's Blue Yellow-backed Warbler (northern parula) from Birds of America
Iris nelsonii: endemic Abbeville iris in its native habitat of Southeast Abbeville, Louisiana