Fagopyrum luojishanense, a New Species of Polygonaceae from Sichuan, China

Ling-Li Hou; Mei-Liang Zhou; Qian Zhang; Lei-Peng Qi; Xiong-Bang Yang; Yu Tang; Xue-Mei Zhu; Ji-Rong Shao

Ling-Li Hou Sichuan Agricultural University
Mei-Liang Zhou Chinese Academy of Agricultural Sciences
Qian Zhang Sichuan Agricultural University
Lei-Peng Qi Sichuan Agricultural University
Xiong-Bang Yang Sichuan Agricultural University
Yu Tang Sichuan Higher Institute of Cuisine
Xue-Mei Zhu Sichuan Agricultural University
Ji-Rong Shao Sichuan Agricultural University

Keywords: China, Fagopyrum, IUCN Red List, Polygonaceae, Sichuan

Abstract

Fagopyrum luojishanense J. R. Shao, a new species of Fagopyrum Mill. (Polygonaceae), is described and illustrated from Liangshan in Sichuan Province, China. This species is distinguished by its leaf blades that are ovate, narrowly ovate or triangular, winged seeds, and inflorescences that are either axillary or terminal, and we further distinguish the new species based on karyotype analysis. Fruit surface ornamentation of F. luojishanense is densely and irregularly warty, while fruit ornamentation is sparser in F. gracilipes (Hemsl.) Dammer ex Diels. Fagopyrum luojishanense is a diploid taxon, with 2n = 2x = 16 and a karyotype of 16 metacentric chromosomes, while F. gracilipes is tetraploid, 4n = 4x = 32, with a karyotype of 30 metacentric and two submetacentric chromosomes.