I live in south Oklahoma City and I just discovered these plants growing in my backyard and I'd like to find out what they are. I apologize for the image quality. I had to use my cell phone and it's a bit dark and rainy outside.
Plant #1 (plastic bag not part of foliage):
I really like these guys. I've never seen them before but they're beautiful. They're growing behind a western fence next to my garbage cans so they get very little sunlight, yet they seem to be thriving. As you can see, it's a pretty barren area and even pesky weeds struggle to make a living there. They're bringing life to an otherwise dead area of my lawn. It seems to have a spiral leaf pattern if that helps any.
This one sprung up along a pet fence next to my back patio. It seems to have long stems that produce three leaves per node.