New York Natural Heritage Program
Globose Flatsedge
Cyperus echinatus (L.) Wood
Monocots
Cyperus echinatus illustration USDA Plants website
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: S1
A State Rarity Rank of S1 means: This plant is endangered/critically imperiled in New York because of extreme rarity (typically 5 or fewer populations or very few remaining individuals) or is extremely vulnerable to extirpation from New York due to biological factors.

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?
In New York this flatsedge has only ever been collected around the New York City area, mostly in the late 1800s and early 1900s. It was seen a few times after World War II up until 1950, but not collected again until the 1980s in the serpentine areas of Staten Island. These records represent the most northern extension of the species along the Atlantic coast.

State Ranking Justification [-]
There are currently believed to be five existing populations, but two of them have not been seen since the 1980s and may have been shaded out by natural succession. They may still persist in the seed bank. Only one population has more than 100 plants. There are two old records from Staten Island which have not been resurveyed and there are nine more records which are now considered extirpated.

Short-term Trends [-]

Long-term Trends [-]