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The nuclear ribosomal DNA internal transcribed spacer  (ITS) sequences from 44 Indian Polygonum taxa were examined to  investigate relationships among various sections proposed by earlier researchers.  The maximum parsimony trees obtained from analysis of the ITS sequences  suggested eight major groups of the Indian Polygonum spp. The  relationships among different sections were largely congruent with those  inferred from morphological characters as described by Hooker. Also, the  treatment of the Persicaria suggested by Haraldson on the basis of  anatomical characters proved to be nearly in line with that based on our  molecular data. We provide a high resolution of phylogeny of the Himalayan Polygonum  sensu lato and support merger of the section Amblygonon in the section Persicaria.  Moreover, we made the first phylogenetic analysis of many of the less known  Himalayan Polygonums, including Polygonum microcephalum, P. assamicum, P. recumbens, and P. effusum. Molecular differences were detected  among Persicaria barbata collected from different geographical locations  of India, although these were not differentiated at the morphological level.

Phylogeny and systematics of Indian Polygonum sensu lato in the subfamily Polygonoideae based on ITS sequences of nuclear ribosomal DNA