Because it didn't bloom at all while outside on our deck this Summer, I had forgotten that I even had a red tree hibiscus until today.
It's an unnamed variety.

All of my hibiscuses have been back inside the Solar Room since October 11th when we were getting ready for an early season freeze.
They seem to be blooming better inside now than they did out on the deck all Summerlong.
This red blooming tree hibiscus certainly has been a nice surprise. It really is bright, fire engine red.