If I followed you correctly you have some variety of smartweed in and around your wetland. If so this will put on enough seed biomass to allow for regeneration of the plant species as long as an adequate drawdown is done. There are many species of smart weed in central texas so you may have stumbled onto a similar species while walking in the woods. As for smart grass I have never heard of such a species of grass. Did the biologist give you a scientific name or possibly another common name used to identify it? I hope this helps if not feel free to pm me, I am currently doing some research on annual wetland plants.
Take a man duck hunting and he will eat for a day; Teach a man how to duck hunt, HIS WIFE WILL HATE YOU.