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CANADA FX DEBT-C$ slumps to 4-1/2-yr low, hit by Yellen comments

* Canadian dollar at C$1.1245 or 88.93 U.S. cents * Bond prices lower across the maturity curve (Recasts, adds details on Fed, quote, updates prices) By Leah Schnurr TORONTO, March 19 (Reuters) - The Canadian dollar fell to a more than 4-1/2-year low against the greenback on Wednesday, hit by the double-whammy of a more dovish-than-expected central bank at home and concerns the U.S. Federal Reserve could raise rates sooner than had been anticipated.

After several weeks of consolidating in a relatively narrow trading range, analysts said the sharp move could mark a resumption of the bearish attitude toward the loonie that hammered the currency at the beginning of the year.

The Canadian dollar started the day weaker but selling picked up in the afternoon, sending it through the key C$1.12 level after the Fed released a statement revamping its guidance on when it could eventually raise interest rates.

The sell-off accelerated further after Chair Janet Yellen said the Fed will probably end its stimulative bond-buying program this coming fall and could start raising rates around six months later.

"I was very surprised to hear her say she thought the considerable period probably meant something like six months, but we'll just have to see. Most people would have read the statement on that and thought that's like a year," said Greg Anderson, global head of foreign exchange strategy at BMO Capital Markets in New York.

"So where she's saying the end of taper in October, six months from there, that means March 2015. Obviously she's throwing stuff out there and saying it's tenuous, but that's still 6 months sooner than I think most people had on their radar screens." The Canadian dollar touched a session low of C$1.1273 shortly after Yellen's comments, its weakest level since July 2009. It ended the session at C$1.1245 to the greenback, or 88.93 U.S. cents, weaker than Tuesday's close of C$1.1137.

Uncertainty about U.S. interest rates comes on the heels of comments from Bank of Canada Governor Stephen Poloz that reinforced the view that rates in Canada will stay low for some time.

The drop in the loonie likely signals a resumption of the trade seen in January that took the currency sharply lower, said Shaun Osborne, chief currency strategist at TD Securities in Toronto.

Osborne has a target for the loonie to fall to C$1.1760, or 85 U.S. cents, by end of June.

Monetary policy has been a major driver of the Canadian dollar in recent months after the Bank of Canada shifted gears last year by dropping any mention of interest rate hikes on the horizon.

"Most people in the market have been bearish on the Canadian dollar, but they backed off on their position and didn't really have it on in size going into the last several days," said Anderson.

"As a result you could have continued extension over the next couple days as people say, 'I missed it, but that is my favorite trade, and I've got to get back in.'" On a technical basis, there's little in the way of the currency until the C$1.15 level, said Anderson. While he doesn't expect the loonie to fall that far over the next few days, "it wouldn't shock me to get to C$1.1350." Analysts said there was little impact on the currency from the resignation of Jim Flaherty as finance minister. Former Energy Minister Joe Oliver was named Canada's new finance minister on Wednesday and is seen as likely to stay the course on fiscal policy.

Canadian government bond prices were lower across the maturity curve, with the two-year down 10-1/2 Canadian cents to yield 1.063 percent and the benchmark 10-year down 63 Canadian cents to yield 2.475 percent.