New York Natural Heritage Program
Knotted Spikerush
Eleocharis equisetoides (Ell.) Torr.
Monocots
Eleocharis equisetoides Matt Hickler
Family: Sedge Family (Cyperaceae)

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: G4
A Global Rarity Rank of G4 means: This species is apparently secure globally (typically with more than 100+ populations), though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
Knotted spikerush is one of the largest and most beautiful of the Eleocharis species in New York. It is the only species with jointed stems marked by light horizontal lines. These joints are what give it its species name which refers to the genus Equisetum, the horsetails, which also have jointed stems.

State Ranking Justification [-]
There are nine existing populations and six of them are in good to excellent condition. Three of them are fairly small and threatened by water birds. There are four historical occurrences which need further checking.

Short-term Trends [-]

Long-term Trends [-]