Amberboa zanjanica (Asteraceae, Cardueae, Centaureinae) is described and illustrated as a new species from Zanjan province, NW Iran. It is a diploid species (2n = 2x = 32) and morphologically most similar to A. sosnovskyi. The new species is compared with A. glauca, A. moschata and A. nana. Also presented are the habit and conservation status of the new species, the geographical distribution of the new species and A. sosnovskyi, and a key to all species of the genus Amberboa in Iran.
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