New York Natural Heritage Program
Coast Flatsedge
Cyperus polystachyos var. texensis (Torr.) Fern.
Monocots
Cyperus polystachyos var. texensis Kimberly J. Smith
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: G5T5
A Global Rarity Rank of G5T5 means: Secure globally - Both the species as a whole and the subspecies/variety are common in the world; widespread and abundant (but may be rare in some parts of its range).


Did you know?
While mostly known from Suffolk County there were two collections of this rare flatsedge from Queens County in the 1890s. It was not collected in Queens again until 2004 when it was found around a small pond near the South Shore of Long Island, a span of over 100 years between sightings!

State Ranking Justification [-]
There are six existing populations but only two of them have over 100 plants. One population from 1989 has been overrun by Phragmites. There are seven records from the early 1900s through 1975 that have not been rediscovered but habitat still remains. Four populations from Western Long Island and Staten Island are now gone because they occurred in natural areas which no longer exist.

Short-term Trends [-]

Long-term Trends [-]