The plant shown is a Salvia greggii, a true sage.
Leucophyllum frutescens is a gray leaved shrub, though there are green cultivars, and it has a bell shaped bloom. Although two of its common names do include sage in them, it is from an entirely different family. It's common names are Cenizo, Texas Sage, Purple Sage, or Texas Ranger.
It was great fun. I have many more photos that I can't fit into PN.
I first saw it as I was about to walk out on an observation deck over one of the ponds. It was there ahead of me watching something in the water. I got quite a few photos there. Apparently it decided whatever it had been watching was not going to pan out, and headed back to the trail where I was standing. That's when it first noticed me. It studied me a moment, and apparently decided, in typical cat fashion, that I was beneath consideration, so sauntered right by. It could easily have taken to the cattails or bushes along the trail, but didn't. It stayed on the trail, stopping here and there to watch frogs, lizards and water fowl, while I followed at a distance. It glanced back at me occasionally, but otherwise took little notice.
When it reached the far side of the wetlands near the entrance, it turned around and again walked back by me on the far side of the trail, at which point I figured I had followed it long enough and moved on.