What is a species of Dorstenia (D. Contrayerva), a South American plant, the aromatic root of which is sometimes used in medicine as a gentle stimulant and tonic called?

contrayerva — A species of Dorstenia (D. Contrayerva), a South American plant, the aromatic root of which is sometimes used in medicine as a gentle stimulant and tonic. (Webster's 1913.)

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