Iris prismatica explained

Iris prismatica, the slender blue flag or cubeseed iris,^[1] 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.^{[2] [3] [4]}

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 2–3 blooms in May.^[1] Flowers are pale blue to blue-violet.^{[5] [6] [7] [8] [9]} It tends to grow in swampy,^[1] wet conditions,^[2] 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.^[10] It is cold hardy to USDA Zone 3.^[1]

Notes and References

1. Donald Wyman
2. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101713 Flora of North America v 26 p 395, Iris prismatica
3. http://bonap.net/MapGallery/County/Iris%20prismatica.png BONAP (Biota of North America Project) floistic synthesis, Iris prismatica
4. Rodionenko, Georgi Ivanovich. 2007. Botaničnyj Žurnal 92: 552. 2007.
5. https://www.biodiversitylibrary.org/page/396444#page/67/mode/1up Pursh, Frederick Traugott. 1813. Flora Americae Septentrionalis 1: 30.
6. Godfrey, R. K. & J. W. Wooten. 1979. Aquatic and Wetland Plants of Southeastern United States Monocotyledons 1–712. The University of Georgia Press, Athens.
7. Chester, E. W. 1993. Atlas of Tennessee Vascular Plants Volume 1. Pteridophytes, Gymnosperms & Moncots. 118 pp.
8. Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Manual of the Vascular Flora of the Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
9. Gleason, H. A. & A.J. Cronquist. 1968. The Pteridophytoa, Gymnospermae and Monocotyledoneae. 1: 1–482. In H. A. Gleason New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada. New York Botanical Garden, New York.
10. Web site: Natural Resources Conservation Service. United States Department of Agriculture. 22 May 2014.