About two years ago I recieved a small cutting from a neighbor. She said it was her father's and was a citrus (she has since moved). It spent the first summer on my balcony and the winter in my bedroom, both with Northern exposure. It gets small clusters of white flowers and has a distintive odor; it doesn't really smell like a citrus (orange, lemon, lime,...). I've only had it about two years and although it has flowered profusely it has never developed any fruitlets. I've started a few new ones from cuttings aready. Any help with it's proper name and what type of citrus (or whether it even is a citrus)? I'm including a few pics. Any suggestions on what I should be looking for to identify this plant? If you need a particular pic I can take one. Thanks in advance, Bart.