Chepiche (porophyllum tagetoides - aka pipitza, pipicha, tepicha) is a Oaxacan herb with small leaves on green stems. It has a piney/minty aroma and a strong flavor that is cilantro-esque with sour & citrusy notes.
Like cilantro, it is most often used raw as a finishing touch for cooked dishes or an ingredient in uncooked foods (like salsa), rather than being cooked itself. It lightens heavy dishes and brightens lighter foods.