Answer: Cornus kousa var. chinensis is described in Dirr's Manual of Woody Landscape Plants as being botanically very similar to the species (this is typical for something listed as a "var.") but is noted for growing more freely and with larger flowers than the straight species. There is no specific cultivar name for it.
ps I think you may have asked earlier about the oakleaf hydrangea. If so I apologize for sending you an incorrect answer at that time. The botanical name for this hydrangea is Hydrangea quercifolia. I realized I had mis-thought immediately after hitting the send key and unfortunately there is no way to trace our answers or send a correction. You would need a specific cultivar name to identify it more specifically, if not then you would probably assume it to be the straight species.
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