Sorbus setschwanensis Koehne is a pinnate‐leaved Sorbus s.str. species endemic to China with narrow distribution and intriguing phylogeny that needs wider attention. In this paper, the complete chloroplast (cp) genome of S. setschwanensis is reported, and its phylogenetic position is analyzed. The complete cp genome of S. setschwanensis is 160 064 bp in size with 36.50% GC content. It has a typical quadripartite structure including a pair of inverted repeat regions (IRs) of 26 378 bp that separates a large single copy (LSC) region of 86 013 bp and a small single copy (SSC) region of 19 295 bp. The cp genome encodes 108 genes, comprising 76 protein‐coding genes, 28 tRNA genes and 4 rRNA genes. Additionally, 52 simple sequence repeats (SSRs) and 43 dispersed repeats were identified. Comparison of the whole cp genome with those of other Sorbus species showed an overall high degree of sequence similarity, but there are six highly variable regions (trnR‐atpA, petN‐psbM, ndhC‐trnV, trnE‐trnT, trnT‐trnL and rpl32‐trnL) located in intergenic spacers that may be useful as molecular markers in future population genetic and phylogenetic studies in the genus. Phylogenetic analyses based on 108 coding genes from 25 species in Rosaceae revealed that S. setschwanensis is nested within Sorbus sect. Sorbus together with other pinnately leaved species, but does not form a sister lineage to S. rufopilosa belonging to the same series Multijugae. Thus, the systematic position of S. setschwanensis and relationships with other species in the genus needs to be further studied.
This study aims to end the debate whether Indosasa triangulata belongs to Indosasa or Pleioblastus. The evidence from our morphological study and molecular phylogenetic analyses clearly indicate that Indosasa triangulata should be a member of Pleioblastus, rather than Indosasa, and is a distinct species close to Pleioblastus maculatus and P. oleosus. Thus, it is transferred from Indosasa to Pleioblastus in this study. A detailed description as well as two color plates of this species is also provided.
This study elucidates the taxonomic position of Indosasa sangzhiensis in considering whether it belongs to Indosasa or Chimonobambusa. Based on morphological and molecular phylogenetic evidence, our results explicitly indicated that I. sangzhiensis should be a member of Chimonobambusa, rather than Indosasa, and is a distinct species closely related to C. communis, C. opienensis and C. puberula. Thus, the new combination Chimonobambusa sangzhiensis (B.M.Yang) N.H.Xia & Z.Y.Niu is made. A detailed description as well as two color plates of this species are also provided.
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