The rain and break in 100 degree temperatures made August much less miserable than usual. It was enough to bring the garden out of its summer dormancy. As I surveyed the garden on a recent evening, I noticed that a number of the flowers were white.
Another flower that blooms a few days after a rain is the Rain Lily. I think this is Cooperia pedunculata.
Angel's Trumpet, Datura wrightii, produces large trumpet-shaped flowers that open in the evening and fill the air with their perfume. Bees like their nectar so much that they will often try to pry the flowers open in early evening.
There is a lot of buzz about this plant. Here is a Bee Movie I made three years ago. It stars Datura and many, many bees. And, yes, the constant background noise is the buzzing of bees.
All of the plants described above a native to Texas and do not need much, if any, supplemental water to survive those hot dry summers.