I really like your thread subject. I too have been intrigued with green throats and green daylilies. I bought some seed crosses last year and this year with alot of green in their parents. Will see what these crosses produce in a few years. For now, here are some of my greenest daylilies.
Sharyn Lianne
Laura Harwood
Unknown Seedling
And I agree that Magic of Oz is very nice green.