@ardesia, i just noticed a little 'wing' on female flower on one of my rexes. i never paid attention before!
I got 2 last summer at Longwood (had several years break from rexes):
Boston choc'n cherries was looking quite uninteresting until i got it to Miami FL and put it in East window with 4-5 hours of sun. there is a big difference in coloration. The same with the second rex too. got to get better pics to show...
here's Boston one: the rightmost leaf is from 3 months in South FL