A phylogenetic study of Chinese Polygonatum (Polygonateae, Asparagaceae)

Abstract

Polygonatum Mill., which consists of more than 60 species are mainly distributed in eastern Asia, especially China and Japan, has received considerable attention from plant taxonomists. Nevertheless, there are still gaps in our knowledge of this genus, especially concerning those species that are endemic to China and which have often not been included in previous studies. Here, we re‐evaluate the taxonomy of 28 Chinese Polygonatum species with emphasis on molecular evidence. Phylogenetic analyses were carried out on sequence data from four plastid DNA regions: atpB‐rbcL, matK, rbcL and rps16, using maximum parsimony and Bayesian approaches. Analyses of the combined datasets of the four regions revealed that: 1) Chinese Polygonatum are monophyletic at the current level of sampling; 2) three major lineages in Polygonatum are well supported and largely correlated with cytological and morphological characters; 3) our results, along with the results of previous works support that P. simizui is a synonym of P. odoratum, and 4) Polygonatum cirrhifoliodes is shown to be distinct from P. cirrhifolium.