A new species, Euphorbia khorasanica Saeidi & Ghayormand (Euphorbiaceae), is described and illustrated from Khorasan Province, NE Iran. It belongs to sect. Pithyusa and is morphologically closely related to E. kopetdaghi, E. microsciadia and E. sogdiana, but differs from them by having very narrow cauline leaves and shorter ray leaves.
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