Native or cultivar?

Alongside my garden are towering native swamp maples (Acer rubrum, more commonly called red maples), tulip poplars (Liriodendron tulipifera), and an occasional oak (Quercus rubra) and dogwood (Cornus florida) in the narrow swath of forest that is bisected by a small, spring fed creek. The native forest is a blessing, and sometimes a hindrance as…