Assertion: douglas fir | /r/CapableOf | grow in the alleghenies
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Source sentences:
text: In North America the balsam fir, or balsam, popular as a Christmas tree and the source of Canada balsam , is native to the Northeast; the Fraser fir, or she-balsam, grows in the Alleghenies and is used as a Christmas tree; and the noble, alpine, and red firs are found at high altitudes and the grand, silver, and white firs on lower mountain slopes in the Northwest.