A new species from the W part of the Iranian Zagros Mountains in Ilam province, Dionysia robusta (Primulaceae), is described, illustrated and compared with similar and related species. It differs from these relatives in leaf shape, length and density of glandular hairs, and shape of the calyx. The DNA sequence of the nuclear ribosomal ITS region of D. robusta is most similar to that of D. gaubae.
Version of record first published online on 1 April 2016 ahead of inclusion in April 2016 issue.