Ryan Fezz

Very common indeed and now a preferred host plant for the Ceraunus Blue Butterfly, which tends to fly low to the ground.

I can tell you for sure its a Lupinus but the exact species is trickier

This is a tricky one. Its either Lobelia feayana or L. glandulosa. I personally lean to L. feayana due to the color of the stem. http://florida.plantatlas.usf.edu/Plant....

I am almost completely sure you have a Scutellaria that has gone to seed. I can guess integrifolia as its the most common but without more info thats the best I can do.

W. marginata is the only species that occurs anywhere in central Florida so this must be it.

Reminds me very much of another Yelow Milkwort, Polygala rugelii, http://florida.plantatlas.usf.edu/Plant....

PucaK had the right idea but was abit off. I am 100% sure you have Marsh Seedbox or Ludwigia palustris.

I personally have always known the genus Pluchea as the Camphorweeds but then, thats what scientific names are for. Anyways, my money is on Pluchea baccharis or Rosy Camphorweed.

Trust me, its incarnata. I work in the Natural History Museum right in front of NATL and walk those paths all the time.

You do indeed have a Hypericum and my money is on Sandweed - Hypericum fasciculatum which likes it wet, can get as tall as you say and tends to have a rather irregular growing growing habit, which seems to be the case looking at your photos.