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|Noun||1.||genus Arethusa - genus of bog orchids of North America and Japan|
liliopsid genus, monocot genus - genus of flowering plants having a single cotyledon (embryonic leaf) in the seed
family Orchidaceae, orchid family, Orchidaceae - enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers
arethusa - any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers