Hi Carns!
I have a book entitled: Waterwise Plants for Sustainable Gardens. I love reading this book since I am into drought tolerant plants too with our ever dry environs here later on. Plus the colorful pictures help a lot. But it references tolerances as to the planting zones, but sometimes says which plants resents humid heat.
Pretty much, I take all suggestions at face value, since my location always misses the temperature limits on forecasts, either too hot or too cold. And have grown drought tolerant plants, observed them that at 100F dry furnace heat temps, plants go on survival mode, dropping leaves and flowers and will go somewhat dormant and wait patiently till the better 80F temps returns. Very, very few plants will stand being in 125F.
