We received a cutting of another species of Epiphyllum, Epiphyllum Oxypetalum last year, June 2019.  As a totally surprise, we observed couple of buds on Sep. 24, 2020. Yesterday, Sep. 29, 2020.  We finally believed that one of buds was going to open.  You could see that the bud changed orientation and size.  So exciding!!  Wow, it only took 15 months to have buds and 5 days to bloom although I stayed up three nights in a row so I would not miss the actual blooming.  At 4:45 pm, Sep 20, 2020, we could see outer reddish tepals bend outward a little more.  Green color of stems were getting less green and more toward the white side.  We also noticed that the tip of the buds were getting a fussy look,  see as follows:

So far, primary stems were up to 50″ long.  Opps, the longest stem was just broke as it got too heavy with leaves.  Oh well.  Secondary stems were flat, approximately 23″ x 4″.  The flower was slower to open and quicker to close maybe because of size and weight.  We were able to captured the moment though along with color and movement. Stamens as male part are white / yellowish and soft, and female pistil with white stigma on top and white long tube.  It is spectacular.

Oct. 25, one more Epiphyllum Oxypetalum started opening early at 8:31 pm and then last photo of the day was taken at 10:02 pm for the day as follows: