BTW, I probably should clarify that it is an unknown rather than unnamed. Bought it from a local guy about 10 years ago & he called it Sturtevantii. Some other lily collectors informed me many years ago that it doesn't look like Sturtevantii. So, maybe someone else will speak up & show their Sturtevantii photos as Victoria Adventure doesn't show a picture in color to compare. The bloom does stay mostly cup shaped by the time I see it (either evening or early morning). I never think to go outside at night to see if it opens up more.
Have fun with it as it is an excellent grower & bloomer. I interestingly enough, it stays rather compact compared to other nightbloomers that I've grown.