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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.
The acorns most worth bothering with are considered to be those of the oak tree known variously as holly, holm or ilex oak (Quercus ilex var rotundifolia -- aka var ballota) which grows all around the Mediterranean, including particularly north-west Africa, Spain and Portugal. These are long, cylindrical acorns.