Answer: rhatany

AnswerCrossword Clue
rhatanya South American shrub, also RATANY
rhatanyeither of two South American shrubs belonging to the genus Krameria, of the legume family, K. tiandraor(knotty rhatany Peruvian rhatany) or K. argenteaor(Brazilian rhatany Pará rhatany)
rhatanythe root of either of these plants, used as an astringent and tonic in medicine and also to color port wine