How long does the water stay there before it drains? What is the sun exposure? What is your goal with the area, a simple groundcover, perennial garden, rain garden? You are going to need a mix of plants for year round bloom if that is your goal. You should look to plants that grow in ephemeral wetlands or have a FACW wetland indicator. I planted a couple Eutrochium species (Joe Pye) as well as Clethra alnifolia and sweetbay magnolia in such an area of my yard, however my area drains after a couple dry days. Im trying swamp milkweed (Asclepias incarnata), Lobelia cardinalis and Lobelia siphilitica in the same area this year. A few Amsonia, Chelone, Packera, Helenium, and Carex (sedge) species should be adaptable to these conditions as well.

I have an area like this where I've planted a dawn redwood, red twig dogwoods, ostrich ferns, clethra, variegated sedge... I regret that the norway spruces weren't planted on berms or rocky mounds because I don't think they will make it, Canna do great in the summer (dug up over winter). And elephant ears!

It sounds like you want plants that will tolerate both wet and average conditions. Knowing the answers to Skip’s questions would be helpful.

I have

swamp azalea/Rhododendron viscosum which needs acid soil

Clethra alnifolia which blooms late summer and has lovely yellow fall color

winterberry holly/Ilex verticillata which is a deciduous holly with stunning berries through fall into winter

I have an area that is under water sometimes for a few weeks in spring (where sump empties). I have hostas, swamp milkweed astilbe, geum rivale, carex Treasure Island, mukdenia, and tricyrtis which is just beyond the actual water line. These are all shade plants except the milkweed. Ligularia, The Rocket is more for sun and will tolerate a bit of wet and maybe some Monarda depending on how long its underwater.

Let's keep this to natives please.

Some of the most spectacular native flowers are found in the wet ground, like Hibiscus, Aster, Joe Pye Weed, Milkweed, Cardinal flower, and more I can't think of right now. Having a great wet spot is an asset most don't have.