New York Natural Heritage Program
Willow Oak
Quercus phellos L.
Family: Beech Family (Fagaceae)

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?
Willow oak is also planted extensively as a street tree in New York City and it is sometimes difficult to distinguish native trees from those that were planted.

State Ranking Justification [-]
There are five existing native populations, but except for one population of tens of trees, there are only a few trees in the other populations. There is one historical population on Long Island and one on Staten Island, but there are also many planted trees around the New York City area.

Short-term Trends [-]

Long-term Trends [-]