I also grow a C. lueddemanniana var. Stanleyi, and at our last monthly meeting three more were put in front flowering. I was told that it is a hybrid made many years ago in Brazil from C. lueddemanniana var. semialba and C. warscewiczii. You can see the typical yellow eyes.
And yes, Intruder, September and October is the season for C. maxima to flower on the Northern hemispere.
A very fine collection. Thanks for sharing.