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Sanguisorba , commonly known as burnet, is a genus in the family Rosaceae native to the temperate regions of the Northern hemisphere. Five of its thirty species are distributed in Korea:  Sanguisorba officinalis ,  S. stipulata ,  S. hakusanensis ,  S. longifolia , and  S. tenuifolia .  S. officinalis  has been designated as a medicinal remedy in the Chinese and Korean Herbal Pharmacopeias. Despite being a valuable medicinal resource, the morphological and genomic information, as well as the genetic characteristics of  Sanguisorba , are still elusive. Therefore, we carried out the first comprehensive study on the floral micromorphology, palynology, and complete chloroplast (cp) genome of the  Sanguisorba  species. The outer sepal waxes and hypanthium characters showed diagnostic value, despite a similar floral micromorphology across different species. All the studied  Sanguisorba  pollen were small to medium, oblate to prolate-spheroidal, and their exine ornamentation was microechinate. The orbicules, which are possibly synapomorphic, were consistently absent in this genus. Additionally, the cp genomes of  S. officinalis ,  S. stipulata , and  S. hakusanensis  have been completely sequenced. The comparative analysis of the reported  Sanguisorba  cp genomes revealed local divergence regions. The nucleotide diversity of  trnH-psbA  and  rps2-rpoC2 , referred to as hotspot regions, revealed the highest pi values in six  Sanguisorba . The  ndhG  indicated positive selection pressures as a species-specific variation in  S. filiformis . The  S. stipulata  and  S. tenuifolia  species had  psbK  genes at the selected pressures. We developed new DNA barcodes that distinguish the typical  S. officinalis  and  S. officinalis  var.  longifolia , important herbal medicinal plants, from other similar  Sanguisorba  species with species-specific distinctive markers. The phylogenetic trees showed the positions of the reported  Sanguisorba  species;  S. officinalis ,  S. tenuifolia , and  S. stipulata  showed the nearest genetic distance. The results of our comprehensive study on micromorphology, pollen chemistry, cp genome analysis, and the development of species identification markers can provide valuable information for future studies on  S. officinalis , including those highlighting it as an important medicinal resource.

A Comprehensive Study of the Genus Sanguisorba (Rosaceae) Based on the Floral Micromorphology, Palynology, and Plastome Analysis