I wonder if it *is* an alder? Alders make poor bonsai; I doubt anyone
would sell one shaped in an "S" (they grow so rapidly I don't know how
you'd maintain the styling). You should take it to a reputable nursery
and have it correctly identified, then you'll know what kind of care to
give it.

Sorry I don't have any good guesses- if you have a digital camera you
could post a picture to our gallery.

Nina.