What is the powdered leaves, peduncles, and young branches of certain species of the sumac plant, used in tanning and dyeing. Poison sumac. (Bot.) See under Poison called?

sumac — The powdered leaves, peduncles, and young branches of certain species of the sumac plant, used in tanning and dyeing. Poison sumac. (Bot.) See under Poison. (Webster's 1913.)

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