on underside of Vernonia gigantea leaf
numerous on Cornus racemosa
on Vacinium corymbosum
I'm pretty confident about this one---there was a sign nearby identifying it :-)
The Dodder is the orange stemmed vine with white flowers.
I was inspired to visit some Ohio bogs by rcurtis' observation from a few days ago: http://www.inaturalist.org/observations/389372
This is obviously the same colony of plants he saw.
Assuming Ensifera based on the very long, threadlike antennae.
Flowers were about 1cm across. I think it's a shrub. Leaves are entire, growing opposite on smaller stems, in whorls on main stem (see alternate picture). Plant was growing in a peat bog.
No long tips on the bracts, relatively few flowers per head.
Triangle lake bog. Patchy and perhaps 1/3 are in flower
Triangle lake bog. Occasional all shrubby and under 1.5m