You don't need to trade for milkweed, germinate it on your own. It does require cold stratification of about 60 days which you can easily do. Just wrap them in a damp paper towel, toss them in a ziplock baggie, and toss them in your veggie drawer of your refrigerator for 2 months. I do it differently but then I'm in a different area. Here's where you can get some kick milkweed seed-
http://www.milkweedfarm.com/
Tre, I couldn't begin to have the time to go through your list based on common names. There's a few things sticking out at me but you really need to use their binomials.
Let's take the Iris for example. There are many well behaved exotic introduced iris out there. There are many native iris out there too and all of them are well behaved. Most exotic introduced iris, like hosta, are pretty well behaved. I happen to like iris. I have a few thousand native iris here. Tee he, I also have several hundred non native iris here and non of them are invasive. There is one introduced iris that seems to be extremely popular which is doing a considerable amount of damage, it is the Yellow Flag Iris (Iris pseudacorus). It has naturalized in many swampy moist areas. This is not good. This is where many of our native carnivorous plants like to put down their roots and colonize. Now the Blue Flag Iris (Iris versicolor) is a native and it is not aggressive at all and generally coexists quite nicely. Which iris of the thousand out there do you have? If it's a native, I'd probably be able to recognize it from a photo. If it isn't native, your guess is as good as mine. Regarding the Mexican petunia- I don't need to say much there
Is there a local native plant or wildlife group you could join in your area? I think you are a prime candidate based on your interests.
You really gotta use binomials Tre. Keep your plant tags when you buy plants. Photograph the area where you plant. Create your own stakes and write the binomial on them. That's what I do. After a while, you will become more familiar with your own plants. The use of common names can be a logistical nightmare.