T65 wetlands are comprised of the common Lyngbye's sedge (T6) and Ramensk's sedge (T5) components.  Often these two components are well-segregated on tidal flats, but occasionally they inter-grade over a broad enough area that they can not be mapped separately at a scale of 1:25,000.  The dominant component is named first.  Both of the complexes, T56 and T65, are widespread, found at the mouths of the larger streams and rivers and at the base of the Homer Spit.

T6 is found in the upper reaches of estuaries.  This corresponds with Vince and Snow's (1984) 'Inner Sedge Marsh Zone 7', estimated to be inundated on only the highest spring tides, or an average of 2 times per summer on the Susitna Flats (with a range of 0-5 times per summer), in upper Cook Inlet, Alaska.  Vince and Snow found that water was retained for greater than 5 days per inundation.

T5 is the tidal zone occupied by Ramensk's sedge, and corresponds with Vince and Snow's (1984) 'Outer Sedge Marsh Zone 3', estimated to be inundated on only the highest spring tides, or an average of 3 times per summer on the Susitna Flats (with a range of 0-5 times per summer), in upper Cook Inlet, Alaska.  Vince and Snow also found that water was retained for 2-3 days per inundation.