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Our Daf is in the process of identifying the species which is referred to as “מרור “(Ex 12:8) for fulfillment of the Torah’s mitzvah to consume it on Pesach.[1]
The Mishnah and Baraisa provide an extensive list of vegetables which qualify for this mitzvah. Among them is horseradish, romaine lettuce, endives, palm ivy or succory.
The Gemara then suggests an additional species, hirduf— a piece of wood (possibly oleander bush, an evergreen shrub, the type thrown into the water at Marah by Moshe to miraculously sweeten the water)—for consideration as maror.
This species is identified by Rashi as ruscus, however more likely the species of Rhododaphne Oleander and how Mad Honey stopped Pompey’s army.