I made a quick U-turn to check out these tall yellow flowers which I had not seen on any roadside in the previous day or two. It turns out that this colony of Ragwort was conspicuously associated with a large Texas Leaf-cutter Ant colony. See the last image in the present set and also here:
https://www.inaturalist.org/observations/76428461
BONAP doesn't have a county record for San Augustine Co., but the species is recorded in counties both E and W of here.
http://bonap.net/MapGallery/County/Senecio%20ampullaceus.png
Similarly, USDA PLANTS (new web site) does not show a San Augustine Co. record:
https://plants.sc.egov.usda.gov/home/plantProfile?symbol=SEAM2
On the Prairie Trail.
Salado Creek Greenway 1604 Trailhead Area
blob with legs looks like it's eating an aphid
Not yet blooming. Very slender leaves, almost looks like overgrown centipede grass