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<p>After 15&#xa0;years of field observations and morphological, cytological, palynological, and molecular phylogenetic analyses of the genus <i>Fagopyrum</i> (Fagopyreae, Polygonaceae), we confirm and illustrate <i>F. calcicola</i> Bo Li, M. L. Zhou and Y. H. Tan, a distinct new species from limestone mountains in southern Yunnan, China. Morphological and molecular evidence indicate that <i>F. calcicola</i> belongs to sect. <i>Fagopyrum</i> and shows a close relationship with <i>F. dibotrys</i>. Both species are perennial herbs bearing large corymbose inflorescences and long trigonous achenes that greatly exceed the persistent perianth. <i>F. calcicola</i> is distinct in having a persistent lignified stem base, while <i>F. dibotrys</i> has a stout woody rhizome. Additionally, <i>F. calcicola</i> can be readily distinguished from <i>F. dibotrys</i> by its stems densely covering lenticels and long oblique ocreae. The new species is restricted to karst limestone habitats and may provide valuable germplasm for buckwheat breeding. Detailed information on its distribution, habitat, pollen morphology, somatic chromosome numbers, and a comprehensive morphological description are provided.</p>

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Fagopyrum calcicola (Polygonaceae), a distinct new species from limestone mountains of southern Yunnan Province, southwest China

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Xiaoting Xie,
  • Yuting Gou,
  • Daozhang Min,
  • Shuqing Lei,
  • Zhenhua Zhu,
  • Wei Li,
  • Meiliang Zhou,
  • Yunhong Tan,
  • Bo Li

摘要

After 15 years of field observations and morphological, cytological, palynological, and molecular phylogenetic analyses of the genus Fagopyrum (Fagopyreae, Polygonaceae), we confirm and illustrate F. calcicola Bo Li, M. L. Zhou and Y. H. Tan, a distinct new species from limestone mountains in southern Yunnan, China. Morphological and molecular evidence indicate that F. calcicola belongs to sect. Fagopyrum and shows a close relationship with F. dibotrys. Both species are perennial herbs bearing large corymbose inflorescences and long trigonous achenes that greatly exceed the persistent perianth. F. calcicola is distinct in having a persistent lignified stem base, while F. dibotrys has a stout woody rhizome. Additionally, F. calcicola can be readily distinguished from F. dibotrys by its stems densely covering lenticels and long oblique ocreae. The new species is restricted to karst limestone habitats and may provide valuable germplasm for buckwheat breeding. Detailed information on its distribution, habitat, pollen morphology, somatic chromosome numbers, and a comprehensive morphological description are provided.