Abstract
Rumex palustris (Polygonaceae) is recorded as a new taxon for the flora of Iran. The species was firstly collected from the seasonal wet dune slacks on south Caspian Sea coast, northern Iran. A full morphological description, the anatomical details of stem and leaf, along with illustrations and a distribution map are provided. Moreover, the species is morphologically and anatomically compared with R. dentatus and R. maritimus. The salient features are compared with those of related species and discussed.
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