New York Natural Heritage Program
Swamp Cottonwood
Populus heterophylla L.
Dicots
Populus heterophylla Troy Weldy
Family: Willow Family (Salicaceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is 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?
This tree may be overlooked in southern New York because it is so similar to Eastern Cottonwood. The specific name refers to the presence of smaller leaves produced during the summer after the larger spring leaves have grown.

State Ranking Justification [-]
There are at least 11 known populations, along with an additional ten historical locations. Most of these populations are restricted to a relatively small area where this tree is often locally dominant. As a wetland tree, it may be suseptible to hydrological change, but few direct threats have been observed. There are only limited opportunities for new populations, so this plant will likely always be a rare member of the New York flora.

Short-term Trends [-]

Long-term Trends [-]