Polygonum khajeh-jamali Khosravi & Poormahdi sp. nova (Polygonaceae) is described and illustrated from SW Iran. It can be assigned to Spinescentia group of sect. Polygonum and is characterized by its coriaceous leaves. The leaf epidermis contains a layer of tanniniferous cells with thick walls absent in the other closely similar species.
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Vol. 45 • No. 6