New York Natural Heritage Program
Schweinitz's Flatsedge
Cyperus schweinitzii Torr.
Cyperus schweinitzii Stephen M. Young
Family: Sedge Family (Cyperaceae)

State Protection: Rare
listed species have: 1) 20 to 35 extant sites, or 2) 3,000 to 5,000 individuals statewide.

Federal Protection: Not Listed

State Rarity Rank: S3
A State Rarity Rank of S3 means: This plant is rare in New York (typically 21-50 populations, limited number of individuals, or limited range).

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?
This is a good example of a plant that can seed bank for many years. In the Albany Pine Bush hundreds of plants of Schweinitz's flatsedge reappeared in a sandy area that had been covered for decades by a concrete parking lot. The species name honors Louis David von Schweinitz (1780-1834) whose main profession was a minister but who also developed a parallel career in botany and mycology. He described over 3000 species of fungi and is regarded as the founder of American mycology.

State Ranking Justification [-]
There are 24 existing populations. Eight of these are small and 12 are good to excellent. The species depends on continued disturbance for maintenance. There are 17 historical populations which need to be checked, most from the 1920s through the 1940s.

Short-term Trends [-]

Long-term Trends [-]