Iris prismatica

Iris prismatica, the slender blue flag or cubeseed iris,[2] 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.[3][4][5]

Slender blue flag
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Iridaceae
Genus: Iris
Subgenus: Iris subg. Limniris
Section: Iris sect. Limniris
Series: Iris ser. Prismaticae
Species:
I. prismatica
Binomial name
Iris prismatica
Pursh
Synonyms[1]
  • Iris boltoniana Schult.
  • Iris gracilis Bigelow
  • Iris prismatica var. austrina Fernald
  • Iris sibirica var. trigonocarpa Baker
  • Iris trigonocarpa A.Br. & Bouché
  • Limniris prismatica (Pursh) Rodion.

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.[2] Flowers are pale blue to blue-violet.[6][7][8][9][10] It tends to grow in swampy,[2] wet conditions,[3] 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.[11] It is cold hardy to USDA Zone 3.[2]

References
  1. The Plant List, Iris prismatica
  2. Donald Wyman Wyman's Gardening Encyclopedia, p. 576, at Google Books
  3. Flora of North America v 26 p 395, Iris prismatica
  4. BONAP (Biota of North America Project) floistic synthesis, Iris prismatica
  5. Rodionenko, Georgi Ivanovich. 2007. Botaničnyj Žurnal 92: 552. 2007.
  6. Pursh, Frederick Traugott. 1813. Flora Americae Septentrionalis 1: 30.
  7. Godfrey, R. K. & J. W. Wooten. 1979. Aquatic and Wetland Plants of Southeastern United States Monocotyledons 1–712. The University of Georgia Press, Athens.
  8. Chester, E. W. 1993. Atlas of Tennessee Vascular Plants Volume 1. Pteridophytes, Gymnosperms & Moncots. 118 pp.
  9. 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.
  10. 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.
  11. "Natural Resources Conservation Service". United States Department of Agriculture. Retrieved 22 May 2014.
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