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Staghorn sumac ( Rhus hirta L . ) is a native tree in Eastern Canada whose fruit has been used by aboriginal peoples to treat various illnesses , and has recently been found to be a good source of antioxidants .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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