Roger, the local lumber dealer I work with has Cherry and Maple hand rail and Maple Wall rail. I don't know where you are located, but if you want to talk with them send me an email and I will give you their telephone number.
The other concern is that a single piece of wood supported only at the ends with 10 feet between the supports is not going to give you any real strength if someone is falling and grabs the railing. I would strongly suggest at least one more hand rail hanger in the middle of the span for proper support and strength.
Here is at least one place that sells Cherry railing in the legth you want.Hand rail
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