I don't know, but looking at the leaves it need some magnesium. A 2 year old tree should be 2 to 3 feet high and branching out.

apparently it needs something or idont think it would be having two tone leaves if magnesium the problem mix some epsoms salts in with your fertilizer

Could be anything. Hundreds of varieties out there. You gotta give us more information.

Where did it come from? Purchased? Gift? From seed? From your compost pile? From something you ate? Dug from under a tree?

Scratch and sniff a crushed leaf. Limes and lemons smell like limes and lemons. ...to rule those out anyway.

oh. thanks everyone.

i thought that the leaves were unique, i didn't know that it was due to lack of magnesium.

i have smelt the leaves before, i think that it is a lemon tree.

i think that it was from a kumquat seed though.

maybe it's a varagted variety