New York Natural Heritage Program
Cypress-knee Sedge
Carex decomposita Muhl.

Habitat [-]
There is no specific habitat data known for New York but C. decomposita probably occurs or occurred at the edges of ponds or lakes on floating logs or the bases of Cephalanthus or perhaps Decodon shrubs (New York Natural Heritage Program 2006). Blackwater swamp forests, often growing on cypress knees, cypress bases, or fallen logs (often at or near water level) (Weakley 2006). Marshes, swamp forests, usually on rotten stumps, floating logs, or bases of trees (often Taxodium) or shrubs (Cephalanthus) on lake, pond, and slough margins (Cochrane 2002). Wooded swamps, often on floating longs and bases of trees (most often Taxodium) (Fernald 1970).

Associated Ecological Communities [-]
  • Shrub swamp*
    An inland wetland dominated by tall shrubs that occurs along the shore of a lake or river, in a wet depression or valley not associated with lakes, or as a transition zone between a marsh, fen, or bog and a swamp or upland community. Shrub swamps are very common and quite variable.

    * probable association but not confirmed
  • Sinkhole wetland*
    A small wetland, with or without a pond (a sinkhole pond), that occurs in a poorly drained sinkhole, typically underlain by limestone. Water levels fluctuate seasonally. In some areas there are many sinkholes in a group that are hydrologically connected underground, even though they are clearly separate at the ground surface.

    * probable association but not confirmed

Associated Species [-]
  • Common Buttonbush (Cephalanthus occidentalis)