I agree. I went to a nursery with 'native' in its name, which lead me to believe they only sold natives, and they did have a lot of natives. But...when I got home and started really going through the plant tags, I found some cultivated plants. For example, I bought this mock orange
Virginal Mockorange (Philadelphus x virginalis 'Minnesota Snowflake')
A very pretty plant, but not the true native which is Philadelphus lewisii. I should have paid closer attention to the tags when buying, particularly since the nursery also threw in a Japanese maple as a quantity gift, which is clearly not native here. But, I'm not a purist and the 'near natives' fit in nicely with my real natives.