Slender Blue-flag
Iris versicolor

f14 @ 1/250s, ISO:1000, Nikon D3S w 105mm macro and qty 2 SB-R200 flashes

"Iris prismatica," Wikipedia, the free encyclopedia. Iris prismatica, the slender blue flag or cubeseed iris,is a plant species native to parts of the southern and eastern United States from Maine south to Alabama, as well as to the Canadian provinces of Ontario and Nova Scotia. Iris prismatica is a perennial herb spreading by means of rhizomes that are close to the surface of the soil. Flowering stalks can reach a height of 80 cm. Leaves are long and narrow, up to 60 cm long but rarely more than 5 mm across. It has 23 blooms in May. Flowers are pale blue to blue-violet. It tends to grow in swampy, wet conditions, and within the United States, it is currently state listed as 'threatened' in Maine, New Hampshire, New York, and Tennessee, and state listed as 'endangered' in Maryland and Pennsylvania.
Massachusetts Audubon's Ashumet Holly Wildlife Sanctuary, East Falmouth, Massachusetts