I didn't realize that I left conifer50 hanging with this one.
Reviewing the closeup pic, it looks like a big old Viburnum cassinoides to me. Serrate leaf margins, a little fuzz to the buds, and one extended flower bud in the background just above the top-right pedicel.
Would the viburnum be nudum? Cassinoides is the northern subspecies of nudum while nudum ssp. nudum is the southern version. The plant in question doesn't quite look like the cassinoides in Newfoundland.