New York Natural Heritage Program
Whorled-pennywort
Hydrocotyle verticillata Thunb.
Dicots
Family: Carrot Family (Apiaceae)

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?
Heritage Botanist Steve Young discovered that some of the sites previously documented for this species were actually plants of Hydrocotyle umbellata that had produced more than one whorl of flowers thus resembling Hydrocotyle verticillata.

State Ranking Justification [-]
There are three existing populations but only one of them is large. The other two have less than 50 plants each. There is only one other record that has not been found, from 1910 in Smithtown.

Short-term Trends [-]

Long-term Trends [-]