I think the third plant might be a type of Button Bush. Was it a shrubby type plant, rather large, growing on the edge of a water way of some sort. I think it might be Cephalanthus occidentalis with mature blooms. I'm not sure though. I like your photo a lot because I have this plant growing on the river banks and it looks like this in the fall. All the Google images show fresher blooms earlier in the season and I don't notice the plant so much then. Maybe because the river bed has water and I'm not down it walking around.
I hope someone else can verify what this plant is. I should go take a photo of what's growing here to compare.
