I've never heard of Litetree before but it doesn't seem to be what you're looking for.
"LiteTree is a crypto currency exchange site. We take cash deposits on one side and litecoin deposits on the other side of the trade. Then we allow our customers to exchange their cash for litecoin or vice versa. LiteTree is a safe and secure platform for buyers and sellers to meet and exchange their litecoins. You will need to have downloaded a wallet separately before using our service. "

Also, their volume is ridiculously low, 52 LTC transacted in 24 hrs is not feasible for any sort of real purchasing.

I'd do a lot more research into this company before sending them a bank wire, or Dwolla, as it looks like they use it.

All my LTC purchases have been with BTC on BTC-e, after purchasing BTC on MtGox   (this was when MtGox was much more functional of course)