Ten

We're never sure whether to call the Pink Explosion a rhododendron or an azalea.  (Technically it doesn't really matter as azalea is a subset of rhododendron).

Searching for distinguishing features I discover.. "An Azalea will usually have five-to-ten stamens; Rhododendrons will typically have ten or more."

Having taken this snap to count them, guess how many this one has...