KAIXUAN ZHANG, YU FAN, WENFENG WENG, YU TANG, MEILIANG ZHOU

　　PHYTOTAXA,   IF: 1.007

　　Published: 13 January 2021

　　https://doi.org/10.11646/phytotaxa.482.2.5

　　https://mapress.com/j/pt/article/view/phytotaxa.482.2.5

　　Abstract

　　A new species of  Fagopyrum  (Polygonaceae),  Fagopyrum longistylum , is described and illustrated from Huili County, Sichuan Province, China on the basis of morphological, caryological, and molecular data.  F. longistylum  is morphologically similar to  F. gracilipes  from which it differs in having green stem and short-styled flowers with long anther but it is self-compatible. In addition,  F. longistylum  is   a diploid species with 2n="2x=16" while  F. gracilipes  is tetraploid with 4n="4x=32." Molecular data based on nucleotide sequence polymorphisms of internal transcribed spacers (ITSs) and the maturase K ( mat K) gene confirm the separation of the new species.