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Allium ampeloprasum (Amaryllidaceae) is recorded as a new taxon for the flora of Iran. It is morphologically most similar to Allium atroviolaceum and Allium iranicum. This species is compared with its two aforementioned relative species and some notes are given on its affinities. A full description, images and a distribution map are also provided. In addition, a lectotype is selected for A. atroviolaceum.