I believe this may be a Oriental dogwood as those appear to have the pointed tips of the bracts. Tewhano, those are actually bracts not flowers. The flowers are the part in the center & in your photo the flowers have not bloomed yet. We do commonly refer to the dogwoods as blooming though when the bracts on the trees open.
It can be distinguished from the flowering dogwood (Cornus florida) of eastern North America by its more upright habit, flowering about a month later, and by the pointed rather than rounded flower bracts.
The white, pointed bracts are produced a month later than flowering dogwood and are effective for about a month, sometimes longer.
the true flowers (which are ornamentally insignificant) are small yellow-green inflorescences centered among the four showy white bracts, the latter of which are obovate and distinctly acuminate, with the diameter of the entire inflorescence being about 3" wide
The bracts themselves with the flowers and the show that you get are about 4 inches wide, now the interesting thing about this is that you are going to get flowers that have a tapered tip kinda point to it, a lot different than our native flowering dogwood.
On your dogwoods, do the leaves come out before the flower bracts open?