A crinum? Well, I am not aware of any that are so small. This bloom is only about an 1 1/2". I was unable to get a straight on shot as it was in the middle of a heavily planted bed; had to use the zoom to get that picture. It is hard to tell but the flowers/buds are arranged along the stem not at the tip like on my various crinums.
I went back last week and looked at it again. The flowers are gone and are you all ready for this? It is a common green airplane plant. Well, maybe not so common as the flowers were pretty showy when it was in full bloom. We were all stunned to see what it was.