This is my favorite site to look for flowers native to my area. They have a pretty good site search that will let you customize it for your area, for vines, etc. They only have information on native plants, so if you search and select carefully, you should be able to find something that needs very little care.
USDA zone 7b/8a (depending on the year and microclimate
), AHS heat zone 8-9, Eastern Crosstimbers/Grand Prairie ecozones