This is a Dorsett Golden Apple. I can attest that it is perfectly suited for Phoenix, Arizona. I harvested my first apple this week. I was surprised how early it was ready. Indeed, I could have picked it in May! I like my apples a little green.
The tree was planted last year. I plucked off most of the blossoms so that the tree would focus on growing and not reproducing, but I kept one just to taste the fruit. Delicious!!