Yes is does bloom in the evening. I just looked up 4 o'clocks and they look exactly like this flower. I don't know very much about 4 o'clocks. Actually I've never heard of it, or seen it before. Is it possible that it spread from a neighbor's yard?
that is quite possible, as the seeds are very easy to germinate..this is one of the first plants I was able to grow in my childhood flower garden.
They get pretty impressive root systems, so they can be a bit of a nuisance to move/get rid of.
I like them tho, as hummingbirds, butterflies and moths seem to love them.
I have them and thay come in many colors, I dug up some from a flied by my house , and in 4 years thay are poping up all over my yard......love them, but now thay are becomeing a problem...lol