My Son in Los Gatos, CA has what he was told is a "Lemon" tree. It bloomed for the first time. The fruit is VERY large ... larger than any grapefruit I have ever seen!!
The leaves are about 5 inches long ... like a "grapefruit" tree, but have a small "leaflet" atttached to the leaf at the bottom... and branches have thorns up to 2 inches long.
The fruit is still green ... possibly beginning to change to yellow. Can this be super sized lemons, grapefruit ... or another fruit? I have a picture I could send, but could not find how to attach to this message.
Best idea is if you can go to the Plant ID Forum here at this link http://davesgarden.com/community/forums/f/plantid/all/
and post your question with the photo. When you write your message, look below that box for the small field labeled "Image: " with Browse... next to it.
Good luck! Thanks for reading.