This is from the same vine as yesterday's flower. I believe it is a Moonflower. Here is some information from the web:
"Moon flowers open in the evening so they can be pollinated by night-flying moths. Like most moth-pollinated flowers, the moon flower is white, which attracts moths. The moon flower is a close relative of the morning glory, which opens in the morning so it can be pollinated by bees and other insects that are active during the day. On a warm summer night, moon flowers can open in a matter of several minutes."
The only discrepancy between my reality and the information here is that yesterday's bloom--and several others--were open in the day. I guess they didn't have access to the web.
