A single small population of chasmophytic plants is described as Mojiangia oreophila,a monotypic genus in the subtribe Crepidinae,characterised by a unique combination of morphological features,in particular densely l...A single small population of chasmophytic plants is described as Mojiangia oreophila,a monotypic genus in the subtribe Crepidinae,characterised by a unique combination of morphological features,in particular densely long-papillose homomorphic achenes with five main ribs each accompanied by two secondary ribs,coarse brownish pappus bristles,moderately many-flowered capitula,a small involucre with numerous outer phyllaries,perennial rosette herb growth and brown-woolly caudex and leaf axils.Molecular phylogenetic analysis detected that in the nrlTS phylogeny M.oreophila forms a clade of its own in the Crepidinae;in the plastid DNA phylogeny it is nested in the clade formed by the hybrid-ogenous genus Faberia,the maternal ancestor of which comes from the Crepidinae and the paternal ancestor from the Lactucinae,where Faberia is placed in nrlTS phylogenies.M.oreophila shares several morphological features with Faberia and also shares the expected chromosome number of 2n=16 with its hitherto unknown maternal ancestor.M.oreophila may therefore be a successor of the maternal ancestor of Faberia.Alternatively,cytonuclear discordance is to be assumed in Mojiangia,caused by chloroplast capture as a result of hybridisation and introgression with Faberia.展开更多
A new species, Lysimachia septemfida(Primulaceae), from Yunnan(Southwest China) is described and illustrated. The new species exhibits several unusual characters in Lysimachia including lack of a corolla,7-merous flow...A new species, Lysimachia septemfida(Primulaceae), from Yunnan(Southwest China) is described and illustrated. The new species exhibits several unusual characters in Lysimachia including lack of a corolla,7-merous flowers, leaves in whorls of 3 and distinct multicellular nodiferous hairs, which make it readily distinguishable from all other species in this genus. The diagnostic differences between this new species and its suppositive allies are given. In addition, the systematic placement of this new species is also discussed based on an ITS molecular tree.展开更多
文摘A single small population of chasmophytic plants is described as Mojiangia oreophila,a monotypic genus in the subtribe Crepidinae,characterised by a unique combination of morphological features,in particular densely long-papillose homomorphic achenes with five main ribs each accompanied by two secondary ribs,coarse brownish pappus bristles,moderately many-flowered capitula,a small involucre with numerous outer phyllaries,perennial rosette herb growth and brown-woolly caudex and leaf axils.Molecular phylogenetic analysis detected that in the nrlTS phylogeny M.oreophila forms a clade of its own in the Crepidinae;in the plastid DNA phylogeny it is nested in the clade formed by the hybrid-ogenous genus Faberia,the maternal ancestor of which comes from the Crepidinae and the paternal ancestor from the Lactucinae,where Faberia is placed in nrlTS phylogenies.M.oreophila shares several morphological features with Faberia and also shares the expected chromosome number of 2n=16 with its hitherto unknown maternal ancestor.M.oreophila may therefore be a successor of the maternal ancestor of Faberia.Alternatively,cytonuclear discordance is to be assumed in Mojiangia,caused by chloroplast capture as a result of hybridisation and introgression with Faberia.
基金supported by the Traditional Chinese Medicine industry research special project "Characteristic Chinese materia medica resources protection and utilization inrepresentative regions of China" (pilot work of the fourth national survey on chinese materia medica resources) (201207002)
文摘A new species, Lysimachia septemfida(Primulaceae), from Yunnan(Southwest China) is described and illustrated. The new species exhibits several unusual characters in Lysimachia including lack of a corolla,7-merous flowers, leaves in whorls of 3 and distinct multicellular nodiferous hairs, which make it readily distinguishable from all other species in this genus. The diagnostic differences between this new species and its suppositive allies are given. In addition, the systematic placement of this new species is also discussed based on an ITS molecular tree.
