Rediscovery of Acorus calamus (Acoraceae) in Iran

Acorus calamus has already been reported based on a single specimen collected from Guilan province. Yet، this species has not been reported during last 50 years in Iran and thus، its herbarium specimen is not available. A sample of the species was collected from southern area of Sari during a study on aquatic plants of Mazandaran province. According to the new finding، the natural occurrence of the species was confirmed in Iran. Complementary botanical description، photographs of plant habitat and distribution map of the species were presented. Although، according to the Flora Iranica and Flora of Iran Acorus was considered as a genus of Araceae the recent phylogenetic study considered its taxonomic position in Acoraceae as a distinct family. Therefore، Acoraceae is introduced as a new family to the Flora of Iran with a single representative i. e. Acorus calamus.