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Hi Harry,
Yes, the plant came from a good friend in Florida where it got very warm winters with little day to night difference. It always bloomed semi alba before this.
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Florida might have unbearably hot summer days & muggy summer nights, but even if Florida is relatively warm in winter, there usually is a good day/night temp swing (maybe low 80's to low 60's or mid 70's to mid 50's ... not counting cold fronts). That would help explain the previous semi-alba blooms.
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The cross is 'Puanani' x 'Tokyo #1" SM/JOGA
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That's a pretty good cross. Some background on it. Back in the 1980's, a Brazilian grower sent some C walkeriana semi-alba seed to a Hawaii lab. A relatively small number of plants were grown & bloomed, among them, plants which had these clonal varieties: H&R, Ann, Puanani, Tokyo #1.
These four were bloomed in Hawaii. One plant was bloomed by a Hawaii grower, who sold the plant which was given the clonal variety 'Tokyo #1' by its new owner in Japan. We received an AM/AOS for 'Ann', but it was not our best. 'H&R' & 'Puanani' were cloned by the respective owners.
Given the origin & probable age of your plant (since it's bloomed a number of times before, I would guess that it is a division (it looks like a division) of a plant that your Florida friend Michael acquired in Japan. Again, guessing the probable age, I would say that the parents are: a clone of 'Puanani' x the original of 'Tokyo #1, made by the owner of 'Tokyo #1'. There are now many clones of 'Tokyo #1', but because of the age of your plant, it would probably have been made before clones of 'Tokyo #1' were available for breeding.
From the 'H&R' & 'Puanani' clones, we were able to discover 4N plants of each and have used them & 'Ann' as a basis for our some of our intensive C. walkeriana breeding. Offspring such as 'Perfect Blush', 'H&R Supreme', 'Light Fantasia', 'Aloha Kiss' are cousins to your plant. These have demonstrated that they are good breeding parents. Yours should be also ... if you decide to use it.
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My temps are at least a 20 degree difference every day, through most of the summer it can be as high as nearly thirty, with nights in the high 60s.
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That's a really good differential. Our summer differential is probably 10 degrees. Our winter differential is usually 15 degrees, sometimes 20 degrees, usually 85/70 ... but sometimes 80/60 or 75/55 ... & rarely 72/50.
I think the best blooms are when it's in the range of 78/58, with bright days. Then the flowers develop more slowly, flatten out, bloom larger with best shape & substance.