Common tansy (Tanacetum vulgare ... stems that are brown to reddish-brown or purplish-red at the base. The plant has green, fern-like, or feathery alternate leaves. When crushed, the leaves ...

Feverfew (Tanacetum parthenium ... which is found in the plant’s leaves. Studies show that parthenolide may be behind most of the potential health benefits of feverfew (1).