Once a year and only at night, cereus peruvianus monstrosus puts forth a beautiful bloom. By morning (seen here), it's already closing up tight and within a few days, drops off: blink and you miss it.
Ah, the wonders of nature.
That's a beauty, Jane! Glad you captured it!
Very pretty.... those elusive etc. flowers are especially fun when they blossom aren't they? :)