New York Natural Heritage Program
American Waterwort
Elatine americana (Pursh) Arn.
Elatine americana Troy Weldy
Family: Waterwort Family (Elatinaceae)

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?
In a state-sponsored survey of the plants of the tidal Hudson River in the mid-1930s this plant was found at many of the mud flats along the river. Today it is only known from one of them. The genus name comes from the Greek word "elatinos" meaning "of the fir". It was used by Pliny to refer to a plant of the genus Antirrhinum in the Snapdragon family. The pronunciation of the genus "ella-tiny" is pertinent since the plant is indeed very tiny and can be overlooked.

State Ranking Justification [-]
There are two existing occurrences which are very small and contain less than 100 plants total. There are 18 historical occurrences, mostly from the Hudson River from the 1930s. A few are also scattered on Long Island.

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