Abstract
A new species, Polygala guilanica (Polygalaceae), is described from Kooh-Roubar, Gasht-Roodkhan protected area in W Guilan province, N Iran. The new species is distinguished based on its prostrate stem; small, lanceolate, ovate and rhombic, sessile leaves; tiny pink-white flowers in lax terminal racemes; 6 or 8 stamens with sessile anthers, a filiform style and brownish seed with 3-lobed caruncle. Detailed morphological description of the new species, photographs and distribution map are provided. Polygala guilanica is compared with the morphologically closest species: P. kurdica, P. hohenackeriana and P. anatolica. An updated identification key is provided for the Iranian species.
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