Yellow evening primrose, or Oenothera flava, has brilliant cup-shaped flowers that resemble dandelions. The lemon-scented blooms open in the evening and close by noon the next day.
I did not know that there are six blooming plants that open at night:
Invasive plants are Earth's way of insisting we notice her medicines. Stephen Herrod Buhner
Everyone learns what works by learning what doesn't work. Stephen Herrod Buhner
Other gourds bloom at night too.
Cleome or spider flower blooms at dusk and the color is most vivid at the time. It's a heavy bloomer with a long season and self seed readily. I have a little patch coming back every year and attracting hummingbird moths at night.