Crabapple - Malus coronaria
This is a little, stiff tree that produced highly fragrant pink or white flowers in the spring. Later, this ornamental species bears small, acidic fruits favored by raccoons and skunks (unless people get there first to steal the fruit for making crabapple jelly). The apples are approximately 1 inch in diameter and feel waxy to the touch, meaning that they have a lot of jelly-making substance in the skin.
There are many crabapple trees growing through the marsh area. They can sometimes be found growing in a shrub-like form - those may be younger trees.
Be careful around this part of the trail. Poison Ivy has a tendency to proliferate here.