Tansy, Tanacetum macrophyllum (Waldst. & Kit.) Sch. Bip., is often misidentified by herb collectors as yarrow, Achillea … oils hydrodistilled using a Clevenger-type apparatus from A. grandifolia, T macrophyllum, and two plant samples (reputedly … of A. grandifolia, but in fact mixtures of A. grand folia and T macrophyllum) obtained from a local market, resulted in …