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Vincetoxicum Wolf is the third largest genus in Asclepiadoideae, and 23 species are distributed in Japan. We discovered that an erect herb species, distributed in the eastern part of the Honshu island, was invalidly named Vincetoxicum magnificum (Nakai) Kitag. based on Cynanchum magnificum Nakai, nomen nudum. Therefore, we presently name this species Vincetoxicum nakaianum K.Mochizuki & Ohi-Toma, and we give a detailed description in this study. Additionally, we provide photographs that demonstrate its ecology and diagnostic characteristics. [ABSTRACT FROM AUTHOR]

To assess vespicochory in Aristolochia (Aristolochiaceae), we conducted preliminary observations of Aristolochia shimadae under cultivation and in its natural habitat. Two paper wasp species (Polistes spp.) were observed visiting freshly dehisced capsules of cultivated plants of A. shimadae. After removing the seed from the capsule and licking the juicy and sticky substance surrounding it, paper wasps bit off and carried away only a part of the raphe. This behavior suggests that the capsule, including the substance surrounding the seeds, is attractive to them, and the raphe is equivalent to an elaiosome. In our field observations of A. shimadae in a natural habitat, a wasp (Vespula shidai) carried away a seed after licking the juicy and sticky substance surrounding it. This observation of vespicochory is the first report on A. shimadae and the first on angiosperms in Japan. [ABSTRACT FROM AUTHOR]

Species delimitation has long been a subject of controversy, and there are many alternative concepts and approaches used to define species in plants. The genus Amana (Liliaceae), known as "East Asian tulips" has a number of cryptic species and a huge genome size (1C = 21.48–57.35 pg). It also is intriguing how such a spring ephemeral genus thrives in subtropical areas. However, phylogenetic relationships and species delimitation within Amana are challenging. Here we included all species and 84 populations of Amana, which are collected throughout its distribution range. A variety of methods were used to clarify its species relationships based on a combination of morphological, ecological, genetic, evolutionary and phylogenetic species concepts. This evidence supports the recognition of at least 12 species in Amana. Moreover, we explored the complex evolutionary history within the genus and detected several historical hybridization and introgression events based on phylogenetic trees (transcriptomic and plastid), phylonetworks, admixture and ABBA‐BABA analyses. Morphological traits have undergone parallel evolution in the genus. This spring ephemeral genus might have originated from a temperate region, yet finally thrives in subtropical areas, and three hypotheses about its adaptive evolution are proposed for future testing. In addition, we propose a new species, Amana polymorpha, from eastern Zhejiang Province, China. This research also demonstrates that molecular evidence at the genome level (such as transcriptomes) has greatly improved the accuracy and reasonability of species delimitation and taxon classification. [ABSTRACT FROM AUTHOR]

Clear species boundaries are crucial for plans and actions on biodiversity conservation. However, morphological similarities among allied species can result in taxonomic difficulties, thus impeding conservation efforts. In China, Cinnamomum japonicumSiebold is a well‐known endangered plant, yet suffers from longstanding taxonomic issues. Here, we explicitly evaluate whether C. japonicum, C. chenii, and C. chekiangense are the same phylogenetic species on the basis of a multi‐individual sampling strategy. We identified three sets of low‐copy orthologous genes from 19 Lauraceae taxa for phylogenetic inferences. Both the concatenation and coalescent‐based phylogenies supported that C. chenii individuals were embedded in the C. japonicum clade, indicating these two taxa are conspecific. Meanwhile, C. chekiangense accessions formed a monophyly which was not sister to C. japonicum. This result, together with the morphological differences that the leaves of C. japonicum are glabrous with a faveolate pattern of venation while those of C. chekiangense have trichomes and inevident lateral veins, led us to consider both as two distinct species. Based on 17 728 neutral single nucleotide polymorphisms (SNPs), the ADMIXTURE analysis suggested that the Chinese C. japonicum populations in Zhoushan Archipelago (=C. chenii) were genetically differentiated from the Japanese and Korean ones. Furthermore, ecological niche modeling predicted that the present distribution area of Chinese C. japonicum is likely to be unsuitable under global warming scenarios. Together with its limited distribution and genetic uniqueness, we recommend that Chinese C. japonicum deserves conservation priorities. [ABSTRACT FROM AUTHOR]

Background and Aims The East Asian–Tethyan disjunction pattern and its mechanisms of formation have long been of interest to researchers. Here, we studied the biogeographical history of Asteraceae tribe Cardueae, with a particular focus on the temperate East Asian genus Atractylodes DC. to understand the role of tectonic and climatic events in driving the diversification and disjunctions of the genus. Methods A total of 76 samples of Atractylodes from 36 locations were collected for RAD-sequencing. Three single nucleotide polymorphism (SNP) datasets based on different filtering strategies were used for phylogenetic analyses. Molecular dating and ancestral distribution reconstruction were performed using both chloroplast DNA sequences (127 Cardueae samples) and SNP (36 Atractylodes samples) datasets. Key Results Six species of Atractylodes were well resolved as individually monophyletic, although some introgression was identified among accessions of A. chinensis , A. lancea and A. koreana. Dispersal of the subtribe Carlininae from the Mediterranean to East Asia occurred after divergence between Atractylodes and Carlina L. +  Atractylis L. +  Thevenotia DC. at ~31.57 Ma, resulting in an East Asian–Tethyan disjunction. Diversification of Atractylodes in East Asia mainly occurred from the Late Miocene to the Early Pleistocene. Conclusions Aridification of Asia and the closure of the Turgai Strait in the Late Oligocene promoted the dispersal of Cardueae from the Mediterranean to East China. Subsequent uplift of the Qinghai–Tibet Plateau as well as changes in Asian monsoon systems resulted in an East Asian–Tethyan disjunction between Atractylodes and Carlina  +  Atractylis  +  Thevenotia. In addition, Late Miocene to Quaternary climates and sea level fluctuations played major roles in the diversification of Atractylodes. Through this study of different taxonomic levels using genomic data, we have revealed an overlooked dispersal route between the Mediterranean and far East Asia (Japan/Korea) via Central Asia and East China. [ABSTRACT FROM AUTHOR]