A native wildflower, the scarlet clematis (Clematis texensis) is a medium-sized, sprawling perennial vine. It grows from large, tuberous roots, but the stems are slender and the leaves wide and delicate, sometimes being oval shaped and sometimes lobed. When the weather gets too hot and dry, the plant dies back and goes dormant.
I tried for several years to get the vines to grow from seed but without luck. Once the tubers were planted, though, the scarlet clematis has done very well, producing more shoots every year. Although I can't be certain if they are seedlings or just offshoots from underground, there are several small plants that seem to have appeared in our vine jungle lately.