First kousa dogwood bloom
This flower is very small, perhaps 3/4 inch (19mm) across. With time, the blooms get larger and whiter, generally peaking about Easter. That looks to be the case this year.
The "petals" of dogwood blooms aren't petals at all but are bracts. Bracts are modified leaves, and what appears to be the center of the dogwood flower is in fact a cluster of very small buds. Eventually, each of the buds will bloom as a tiny, distinct flower. The poinsettia is another well-known flower with bracts instead of petals.
Athens, Georgia, USA.
flower Athens Georgia USA