This is another "unknown" flower from our wildflower pot. It lasted only one day and is now gone. We had one bloom earlier but I do not see any others.
Interesting. Reminds me a little of Morning Glory in its open bell-type shape. Also reminds me of what we would call "Granny Pop Out of Beds" which are a kind of convulvulus, Calystegia sepium or hedge bindweed. Lovely photograph of it.
@randystreat Thanks, Kathy! This was in the pot at the bottom of the steps which my wife checks daily. Good thing, too, since this flower was gone at the end of the day and it was the only one we found!