New York Natural Heritage Program
Slender Blue Flag
Iris prismatica Pursh ex Ker-Gawl.
Monocots
Kimberly J. Smith
Family: Iris Family (Iridaceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G4G5
A Global Rarity Rank of G4G5 means: Apparently or Demonstrably Secure globally - Uncommon to common in the world, but not rare; usually widespread, but may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. More information is needed to assign a single conservation status.


Did you know?
The roots and rhizomes contain the glycoside iridin that is somewhat poisonous and a skin irritant (Lady Bird Johnson Wildflower Center 2010). That is why it sometimes has the common name poison flagroot.

State Ranking Justification [-]
There are 15 existing populations and about half of these have 100 plants are more. Three populations have over 1000 plants. Forty-one populations were documented from the late 1800s through the 1960s but about half of these no longer exist because their habitat has been destroyed. About 20 populations need to be checked to determine if they still exist.

Short-term Trends [-]

Long-term Trends [-]