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Acorus Calamus Oulu . en Calamus Acorus calamus in pond at the botanical gardens of the University of Oulu fi Rohtokalmojuuri Acorus calamus lammikossa Oulun yliopiston kasvitieteellisess puutarhassa own Estormiz other versions cczero in Oulu Acorus calamus Botanical Gardens of Oulu University July in Finland Taken with Canon