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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 gramineus, sweet flag grass. 8 - 12. This Acorus forms a small mound of fine foliage and is useful in a damp and boggy location. 'Oborozuki' is a yellow variegated cultivar and 'Ogon' is a solid yellow plant.They do not appear to be as hardy as A. calamus, generally growing best in zones 6 to 8.corus is a waterside rush with long, narrow, iris-like foliage. 'Variegatus' is variegated with cream stripes. The rhizomes are sweetly scented as are the leaves when crushed. Plants spread just below the surface but are not invasive and are easily moved if necessary.