Round-leaved dogwood (Cornus rugosa) ?

This photo was taken at the little park, Bank St and Holmwood, May 19, 2008. I am not at all sure this is a correct identification. The stems and trunk were all green, not really with purple 'stains' as it is said to be. No red anywhere. Of note, the flowers were not as advanced as those of red osier dogwood on the same day. But some red osier dogwood branches are just as green. It could be a cultivated dogwood of another type.