Salinity definitely limits the extent of Roseau cane. It is likely not the sole factor, but its a major player. Cordgrass/oyster grass and wiregrass can tolerate salinities much better than Roseau can. Elevation also plays a role in plant zonation in marshes. Higher salt or brackish Marsh is typically dominated by wiregrass, with lower areas dominated by cordgrass/oyster grass. Substrate will play a part too. The southeastern part of the state tends to be slightly more organic than what you will find here.
I've found that deeper waters in these areas will hold Roseau, but they are mostly excluded by the two in this part of the state.
Bulrush will grow in pretty high salinities, but eventually it is excluded by other more tolerant species. Same for Roseau. Its just not as adapted to those conditions here as other species.
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