New York Natural Heritage Program
Estuary Beggar-ticks
Bidens hyperborea var. hyperborea
Bidens hyperborea Stephen M. Young
Family: Aster Family (Asteraceae)

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: G4T2T4
A Global Rarity Rank of G4T2T4 means: Imperiled or Vulnerable globally, or Apparently secure -- Conservation status of the subspecies/variety is uncertain, and could range from high to moderate risk of extinction due to rarity or other factors, or could be uncommon but not rare globally. More information is needed to assign a single conservation status. (The species as a whole is apparently secure globally.)

Did you know?
Estuary beggar-ticks is part of a confusing array of Bidens species that grow in the estuaries of the Hudson River. Surveying for this species is difficult because bloom time is short and its tidal habitat is available only for a few hours a day during low tide. Consequently we have very little information on the distribution of the species in New York.

State Ranking Justification [-]
One historical population has been rediscovered and two new populations have been found since 1985. Six additional historical populations from the 1930s have not been rediscovered.

Short-term Trends [-]

Long-term Trends [-]