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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 acorn, or oak nut, is the nut of the oaks and their close relatives (genera Quercus and Lithocarpus, in the family Fagaceae). It usually contains a single seed (occasionally two seeds), enclosed in a tough, leathery shell, and borne in a cup-shaped cupule.Acorns vary from 1â6 cm long and 0.8â4 cm broad.or other uses, see Acorn (disambiguation) . Acorns from small to large of the Willow Oak, Quercus phellos (very small, at center); the Southern Red Oak, Quercus falcata; the White Oak, Quercus alba; and the Scarlet Oak, Quercus coccinea; from southern Greenville County, SC, USA.