LOL. Pokeweed. Not a tree but probably gets pretty big in TX. (and there are tree pokeweeds in the tropics)

Definitely oakleaf hydrangea

White sweet-clover, yes! Thanks!

Blakrab, you have four similar-looking Plantago species in central Texas. It isn't P. helleri, because that has widely spreading hairs, mid-stem. It isn't P. patagonica, because that has linear-lanceolate bracts beneath the sepals. It may be wrightiana or hookeriana. If wrightiana, the leaf blades are glabrous on the upper surface. If hookeriana, leaf blades are woolly-pubescent on the upper surface. The leaf detail in the photos isn't good enough to lock this down, but leaves with woolly-pubescence usually have a gray cast, and yours are green. I agree with Floral - Plantago wrightiana is a good candidate.