It's funny but I never noticed before that morning glories come without the star being darker such as the variety you have.

But thinking about it morning glories do come in so many different colors and sizes now. I do like the purple ones the best though.
All I know is morning glories grow the best for me as long as I don't try to tell them where to grow! lol They love to be wild and free, so I let them do their own thing each year.
I have a ton of pictures of morning glories. Since I seem to have quite a few I am out taking pictures of them in the rain, in the early morning, in the sunshine, when they are small, when they are wild all over, when I'm bored! My neighbors really must think I am very strange! lol But it's hard not to take pictures of something when it's right there out your back door!
pk