New York Natural Heritage Program
Silver Maple-Ash Swamp
Silver maple-ash swamp Stephen M. Young
System: Palustrine
SubSystem: Forested Mineral Soil Wetlands

State Protection: Not Listed
Federal Protection: Not Listed

State Rarity Rank: S3
A State Rarity Rank of S3 means: Typically 21 to 100 occurrences, limited acreage, or miles of stream in New York State.

Global Rarity Rank: G4
A Global Rarity Rank of G4 means: Apparently secure globally, though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
The naturally occurring hybrid between silver maple (Acer saccharinum) and red maple (Acer rubrum) is the Freeman's Maple (Acer x freemanii). The leaf lobes of the hybrid are intermediate in length compared to its parents. Freeman's Maple is commonly found in silver maple-ash swamps in the counties along the Lake Ontario shore.

State Ranking Justification [-]
There are about a thousand occurrences statewide. Some of the documented occurrences have good viability and many are protected on public land or private conservation land. This community is limited in distribution to the central and western parts of the state, and includes a few large, high quality examples. The current trend of this community is probably stable for occurrences on public land, or declining slightly elsewhere due to moderate threats that include alteration of the natural hydrology and invasive species.

Short-term Trends [-]

Long-term Trends [-]