New York Natural Heritage Program
Cloud Sedge
Carex haydenii Dewey
Carex haydenii Troy Weldy
Family: Sedge Family (Cyperaceae)

State Protection: Endangered
listed species are those with: 1) 5 or fewer extant sites, or 2) fewer than 1,000 individuals, or 3) restricted to fewer than 4 U.S.G.S. 7 minute topographical maps, or 4) species listed as endangered by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S1S2
A State Rarity Rank of S1S2 means: Critically Imperiled or Imperiled in New York - Especially or very vulnerable to disappearing from New York due to rarity or other factors; typically 20 or fewer populations or locations in New York, very few individuals, very restricted range, few remaining acres (or miles of stream), and/or steep declines. More information is needed to assign a single conservation status.

Global Rarity Rank: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

Did you know?
Although Carex haydenii is often mistaken for Carex stricta or vice versa, the two may not be very closely related (Standely et al. 2002). The specific epithet haydenii is named in honor of Ferdinand Vandeveer Hayden, 1829-1887, who discovered this species (Fernald 1970).

State Ranking Justification [-]
There are five known populations and at least eight historical sites. In New York, it is a plant of open habitats of bogs/poor fens, moist meadows, and seasonally wet soils. It is easily confused with Carex stricta and possibly overlooked because of its similarity with this very common tussock sedge. Range-wide there have been observations that this plant is decreasing due to habitat conversion and land use changes. While there have not been enough surveys to support this downward trend within New York, there is no evidence to suggest the same decline is not happening.

Short-term Trends [-]

Long-term Trends [-]