New York Natural Heritage Program
Ogden's Pondweed
Potamogeton ogdenii Hellquist & Hilton
Potamogeton ogdenii Stephen M. Young
Family: Pondweed Family (Potamogetonaceae)

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: G1G2
A Global Rarity Rank of G1G2 means: Critically Imperiled or Imperiled globally - At very high or high risk of extinction due to rarity or other factors; typically 20 or fewer populations or locations in the world, very few individuals, very restricted range, few remaining acres (or miles of stream), and/or steep declines. More information is needed to assign a single conservation status.

Did you know?
This pondweed was not described as a separate species until 1983 and honors Dr. Eugene Ogden, former New York State Botanist and pondweed specialist.

State Ranking Justification [-]
There are only three known populations. These populations may be threatened by the use of aquatic herbicides. As more surveys are conducted, new populations may be encountered. With so few populations now known though, this plant will likely remain rare long into the future.

Short-term Trends [-]

Long-term Trends [-]