New York Natural Heritage Program
Three-ribbed Spikerush
Eleocharis tricostata Torr.
Monocots
Eleocharis tricostata plants Robert Zaremba
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: 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?
The genus name Eleocharis comes from the Greek "elos" for marsh and "charis" for grace. The species name is derived from the 3 sharp angles of the fruit. The germination and growth of this species is very dependent upon water levels in the ponds where it occurs. It may only germinate under flooded conditions. (Zaremba, 2004). This and many other Eleocharis species are important wildlife food for wetland birds and other animals. You can often see damselflies and dragonflies perching on the tops of the stems.

State Ranking Justification [-]
There are six existing populations but three of the sites are surrounded by development and subject to direct human disturbance. Prior to recent survey efforts there were only four historical occurrences known.

Short-term Trends [-]

Long-term Trends [-]