Morning Glories: Can anyone identify this Morning Glory?, 1 by Tree_Climber

Tree_Climber wrote:
First, let me say that I just can't get the color of this flower to photograph correctly, but the shape is unusual (at least to me), so I've posted the picture anyways.

It does have the lighter color around the edges, but the color of the bloom is more of a very dark blue with a purple hue to it and then an even darker center rib. The violet/purple showing in the center of the "petals" is not noticable when looking at it , but when the flower is spent, and shriveled, it's that color.

Now if that hasn't totally confused you ....................... any guesses?

Am I right that this is an unusual flower for for Morning Glories?

I bought these at a local nursery ........... no tag of course, and no one knew it's name.