I have to admit, I lost a $3 bet that the trees coming into bloom last week were dogwoods. I should have known better as I have a dogwood in my driveway I walk past every morning on the way to my truck. It is just opening now. The trees/bushes were exactly what you mentioned Tom, a serviceberry (long slender leaves and clusters of white blossoms with long stamens). I've probably made that mistake for years.