In my flower garden grows a volunteer vine with the most amazing bloom.... the Passion Flower. I often use the term "volunteer" for plants that like to pop-up in the walkways and other surprising places, without any help from me.
If you are not familiar with this flower, click on Passion Flower. This is a wonderful website that gives so much information about Texas Wildflowers. You will not be disappointed with the photos and range of information.
Meggie Mac