Merlin's Moth, 48", new to my garden last Fall and have no photos or idea how tall it may reach here, however I am really looking forward to it. It will be the tallest in my garden, for now.
Something, 40", has not been quite that tall, moved in the Fall and hopefully will do better.
Hyperion, 40"
Flying Saucer, 40", and is typically about that tall.
Cameroon's Twister, 40", also new to my garden last Fall.
I have a number of daylilies between 36 and 40", have not listed those. There are also several coming this Spring that are 40" and above. Can't wait to see all these tall girls at the back of my beds!