Our Washington Hawthorn has similar flowers, but the leaves are different. Also, ours is very fragrant, and is just now blooming in the Lawrenceville area. However, our trunk looks nothing like yours. Yours is very interesting. Does it have large thorns along the branches? Ours does.
Looking in our Audubon tree guide, the leaves look like a Littlehip Hawthorn, but the book doesn’t show a good photo of the trunk.