Below is a close up of the leaves on another unidentified citrus tree in my yard. It is about 15 feet tall, the branches are twiggy, and the leaves are all between 2-3". It blossoms every season and then drops with no resulting fruit. Blossoms have tiny green oval shaped "fruits" about 1/8" in diameter when they drop, and smell strongly of lemon.

I have fertilized for 2 seasons in a row now, and have been giving them proper water.

Is this actually a lemon tree or just wishful thinking?