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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.. calamus and products derived from A. calamus (such as its oil) were banned from use as human food or as a food additive in 1968 by the United States Food and Drug Administration.