Agree, a non-native one used a lot for erosion control.

It's a Gaura, but they're a mess to ID because they were recently folded into Oenothera. The two don't look anything alike, to my eye, so it has really caused confusion. In any case, it is difficult-to-impossible to determine Gaura/Oenothera species from just photos of flowers. You really need leaves, and an overall good shot of the entire plant. But some candidates can be ruled out (overall size and time of flower), so consider these four that grow in Texas: Oenothera curtiflora, O. lindheimeri, O. patriciae, O. sinuosa.

White sweet-clover, yes! Thanks!

Yes, Rivina humilis (Rouge Plant), thanks! I guess it is the same as this specimen, just more verdant due to being shaded. Some report the berries are edible, others claim they are somewhat poisonous to humans...