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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 is the sole genus of the oldest surviving line of monocots.his 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 is the sole genus of the oldest surviving line of monocots.
Acorus calamus (also called Sweet Flag or Calamus, among many common names) is a tall perennial wetland monocot of the Acoraceae family, in the genus Acorus.In spite of common names that include the words  rush  and  sedge , it is neither a rush nor sedge.n Europe Acorus calamus was often added to wine, and the root is also one of the possible ingredients of absinthe. It is also used in bitters. In Lithuania Ajeras (Sweet flag) is added to home baked black bread.