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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 americanus. 1  Acorus, the Latin form of the Greek 'akoron (akoron), presumably an ancient plant name for the Sweet Flag or the Yellow Flag Iris (Iris pseudacorus).ame: 1  Acorus, the Latin form of the Greek 'akoron (akoron), presumably an ancient plant name for the Sweet Flag or the Yellow Flag Iris (Iris pseudacorus).