That is what my brother calls moonflowers. I love them. The best of all worlds is having the blue morning glories blossom in the morning and then the white moonflowers coming out at night.
This photo is 20 days after planting. I sprouted the seeds in the Sproutman's Hemp Bag that the aforementioned brother gave me for my last birthday.
Why didn't somebody tell me what a fun houseplant these moonflowers can be?