<strong>Molecular phylogenetics of <em>Pterocyclus</em> (Apiaceae) based on nrDNA ITS sequences: revised circumscription with a restored species</strong>

Abstract

The genus Pterocyclus Klotzsch, along with many others, constituted the taxonomically complex Pleurospermum s.l. To delimit its circumscription and clarify its interspecific relationships, molecular phylogenetic analysis and detailed specimen examination were carried out. Its status as an independent genus was confirmed, with four species recognized. Pterocyclus wolffianus, the synonymous species of Pterocyclus forrsetii should be restored as an independent species. A new taxonomic account for Pterocyclus and an identification key to its four species, are provided.

Backbone phylogeny and adaptive evolution of Pleurospermum s. l.: New insights from phylogenomic analyses of complete plastome data

“…The presence of the six lineages within Pleurospermum s. l. and their composition inferred by plastid phylogeny in this study are compatible with previous studies that were inferred from ITS and a few plastid fragments (Zhou et al, 2008;Zhou et al, 2009;Downie et al, 2010;Valiejo-Roman et al, 2012;Guo M. et al, 2020;Guo X-L. et al, 2020;Zhou et al, 2020a;Xu et al, 2021;Zhou et al, 2021).…”

“…The other two species (P. wilsonii and P. hedinii) in Pleurospermeae and the species in the other five lineages are supposed to be excluded from Pleurospermum. We support the latest revision of Pterocyclus (group B) (Zhou et al, 2021) and Pleurospermopsis (group F) (Zhou et al, 2020a), while the remaining three lineages remain unresolved and need further investigation. On the basis of phylogenetic inference, comparative analyses found that these plastomes are conserved in terms of genome size, genome structure, IR borders, codon bias, and RNA editing sites among taxa.…”

“…Species selected as representatives of each lineage with inflorescence and fruit shown in boxes on the right are as follows: group A, P. uralense and P. davidii; group B, P. angelicoides; group C, P. amabile; group D, P. hookeri; group E, P. apiolens; group F, P. bicolor. Kljuykov, 1999;Пименов et al, 2011;Murrell et al, 2012;Huipeng et al, 2014;Bai et al, 2015;Murrell et al, 2015;Smith et al, 2015;Zhou et al, 2020b;Ren et al, 2022), followed by the first codon position (Zhou et al, 2008;Zhou et al, 2009;Downie et al, 2010;Zhou et al, 2020a;Zhou et al, 2021), while no sites are situated in the third codon position. Seventeen genes (accD, atpA, atpB, matK, ndhA, ndhB, ndhD, ndhF, ndhG, petB, psaI, psbE, psbF, rpoB, rpoC1, rpoC2, rps14) were found to have at least one editing site in all plastomes, and five (accD, ndhG, ndhB, matK, rpoC) possess editing sites of both kinds of codon position.…”

“…Pleurospermopsis (Zhou et al, 2020a;Zhou et al, 2021). The rest of the lineages are more or less problematic, and most of its members were assigned to Pleurospermum or Hymenidium.…”

Resurrection of Pleurospermum lecomteanum H.Wolff (Apiaceae) based on molecular and morphological evidence

“…was treated as comprising about 50 species widely distributed in northern Asia and East Europe, of which 39 were in China (Pan and Watson 2005). Taxonomic changes by Pimenov and Kljuykov (2000a, b), Pimenov (2017), Pimenov et al (2000) and Zhou et al (2020aZhou et al ( , 2021, have reduced that number considerably. However, relationships among some synonymous species are still ambiguous.…”