Acorus is a genus of monocot flowering plants. This genus was once placed within the family Araceae (aroids), but more recent classifications place it in its own family Acoraceae and order Acorales, of which it's the sole genus of the oldest surviving line of monocots. The exact relationship of Acorus to other monocots, however, is still debated by scientists. Some studies indicate that it's placed in a lineage (the order Alismatales), that also includes aroids (Araceae), Tofieldiaceae, and sev… (More on Acorales)