02347nas a2200217 4500008004100000245008300041210006900124490001000193520169700203653002801900653001201928653002401940653002101964100001901985700001302004700001202017700001902029700001702048700001602065856004802081 2020 eng d00aConflicting phylogenetic signals in plastomes of the tribe Laureae (Lauraceae)0 aConflicting phylogenetic signals in plastomes of the tribe Laure0 v101553 a

Background. Gene tree discordance is common in phylogenetic analyses. Many phylogenetic studies have excluded non-coding regions of the plastome without evaluating their impact on tree topology. In general, plastid loci have often been treated as a single unit, and tree discordance among these loci has seldom been examined. Using samples of Laureae (Lauraceae) plastomes, we explored plastome variation among the tribe, examined the influence of non-coding regions on tree topology, and quantified intra-plastome conflict.
Results. We found that the plastomes of Laureae have low inter-specific variation and are highly similar in structure, size, and gene content. Laureae was divided into three groups, subclades I, II and III. The inclusion of non-coding regions changed the phylogenetic relationship among the three subclades. Topologies based on coding and non-coding regions were largely congruent except for the relationship among subclades I, II and III. By measuring the distribution of phylogenetic signal across loci that supported different topologies, we found that nine loci (two coding regions, two introns and five intergenic spacers) played a critical role at the contentious node.
Conclusions. Our results suggest that subclade III and subclade II are successively sister to subclade I. Conflicting phylogenetic signals exist between coding and non-coding regions of Laureae plastomes. Our study highlights the importance of evaluating the influence of non-coding regions on tree topology and emphasizes the necessity of examining discordance among different plastid loci in phylogenetic studies.

10aIntra-plastome conflict10aLaureae10aPhylogenetic signal10aTree discordance1 aXiao, Tian-Wen1 aXu, Yong1 aJin, Lu1 aLiu, Tong-Jian1 aYan, Hai-Fei1 aGe, Xue-Jun uhttps://lauraceae.myspecies.info/node/2041601785nas a2200193 4500008004100000245017800041210006900219260001200288300001200300490000700312520111000319653002101429653001401450653002201464653001101486653002201497100002401519856004801543 2020 eng d00aStudies in Andean Ocotea (Lauraceae) V. Species with unisexual flowers and sparsely appressed-pubescent or glabrous leaves without domatia occurring above 1000 m in altitude0 aStudies in Andean Ocotea Lauraceae V Species with unisexual flow c08/2020 a192-2300 v283 a

This is the fifth installment of a treatment of Ocotea Aubl. occurring above 1000-m altitude in the Andean countries of Venezuela, Colombia, Ecuador, Peru, and Bolivia. This part covers species with unisexual flowers lacking distinctive characters such as presence of domatia or erect or dense pubescence on leaves. Twenty-six species are treated, of which 12 are new to science. These are O. nidiae van der Werff from Venezuela; O. erugata van der Werff, O. gymnantha van der Werff, and O. lorda van der Werff from Colombia; O. ceronii van der Werff, O. depilis van der Werff, O. homeieri van der Werff, and O. pilosa van der Werff from Ecuador; and O. calcicola van der Werff, O. fulgida van der Werff, O. nana van der Werff, and O. tunquiensis van der Werff from Peru. Ocotea cernua (Nees) Mez is synonymized with O. leptobotra
(Ruiz & Pav.) Mez and O. longifolia Kunth is synonymized with O. aurantiodora (Ruiz & Pav.) Mez.

10aAndean countries10aLauraceae10alectotypification10aOcotea10aunisexual flowers1 avan der Werff, Henk uhttps://lauraceae.myspecies.info/node/2041502086nas a2200253 4500008004100000245011500041210006900156520131900225653001601544653001001560653001401570653001301584653001601597653001301613653001301626100001601639700002201655700002201677700002201699700001901721700002201740700002201762856004801784 2020 eng d00aCryptocarya kaengkrachanensis, a new species of Lauraceae from Kaeng Krachan National Park, southwest Thailand0 aCryptocarya kaengkrachanensis a new species of Lauraceae from Ka3 a

A new species of Lauraceae, Cryptocarya kaengkrachanensis M.Z. Zhang, Yahara & Tagane, from Kaeng Krachan National Park, Phetchaburi Province, southwestern Thailand, is described and illustrated. This species is morphologically most similar to C. amygdalina in that its leaves are pinnately veined, leathery, and apparently glabrous (but microscopically hairy) abaxially, twigs are yellowish brown hairy, and fruits are 1.36 to 1.85 times longer than width. However, C. kaengkrachanensis is distinguished from C. amygdalina in having the leaves of ovate and elliptic (vs. oblong-lanceolate) with leaf aspect ratio (length:width) from 1.38 to 2.28 (vs. 2.46–3.43), and ovoid fruits (vs. ellipsoid) with stalk distinctly swollen (vs. not or only slightly swollen). In addition, phylogenetic trees constructed based on internal transcribed spacer sequences (ITS) and genome-wide SNPs using MIG-seq showed that C. kaengkrachanensis is not sister to C. amygdalina and is distinct from all the other Cryptocarya species hitherto recognized in Thailand. Analysis including other species demonstrates that C. floribunda should be a synonym of C. amygdalina, but we recognize C. scortechinii as a distinct species.

10aCryptocarya10aflora10aLauraceae10aLaurales10anew species10ataxonomy10aThailand1 aZhang, Meng1 aYahara, Tetsukazu1 aTagane, Shuichiro1 aRueangruea, Sukid1 aSuddee, Somran1 aMoritsuka, Etsuko1 aSuyama, Yoshihisa uhttps://lauraceae.myspecies.info/node/2041301270nas a2200205 4500008004100000245014800041210006900189520058100258653001700839653002600856653001300882653002800895653002000923100001300943700001800956700001800974700001200992700001201004856004801016 2020 eng d00aTwo new species of Alseodaphnopsis (Lauraceae) from southwestern China and northern Myanmar: evidence from morphological and molecular analyses0 aTwo new species of Alseodaphnopsis Lauraceae from southwestern C3 a

Alseodaphnopsis maguanensis and A. putaoensis, two new species of Alseodaphnopsis (Lauraceae) from southwestern China (Yunnan Province) and northern Myanmar (Kachin State), are here described and illustrated based on both morphological and molecular evidence. They are morphologically similar to Alseodaphnopsis rugosa and phylogenetically closely related to A. rugosa and A. hainanensis respectively. Their preliminary conservation status is also estimated according to the IUCN Red List Categories and Criteria.

10aKachin state10aphylogenetic analysis10ataxonomy10atropical montane forest10aYunnan province1 aLi, Lang1 aTan, Yun-Hong1 aMeng, Hong-Hu1 aMa, Hui1 aLi, Jie uhttps://doi.org/10.3897/phytokeys.138.3856901968nas a2200205 4500008004100000245016400041210006900205260001200274300000900286490001100295520124400306653003201550653002701582653002601609653001401635653002101649100002301670700002101693856004801714 2020 eng d00aTowards a phylogenetic classification of the Ocotea complex (Lauraceae): an analysis with emphasis on the Old World taxa and description of the new genus Kuloa0 aTowards a phylogenetic classification of the Ocotea complex Laur c01/2020 a1-260 vboz0883 a

Ocotea is one of the largest genera in the Lauraceae (c. 400 spp.), and it has been known to be paraphyletic with respect to most other genera of the New World Lauraceae for almost 20 years. In the traditional circumscription, Ocotea contains not only Neotropical species, but also about 45 species from the African region, including Macaronesia, Madagascar, and the Comoro and Mascarene Islands. Only a few of the species have been included in previous molecular systematic analyses. Here we present a phylogenetic analysis, based on ITS and psbA-trnH sequences of 168 Lauraceae species, including 151 taxa from the Ocotea complex, among them 26 of the 45 Palaeotropical species currently placed in Ocotea. Our results show that the Old World species belong to two well-supported and morphologically distinguishable clades, one of which is placed unresolved among the Neotropical clades of the Ocotea complex, whereas the other is sister to Cinnamomum section Cinnamomum. The two clades can also be differentiated based morphologically. As a step towards a phylogenetic classification, we recognize the second group as the new genus Kuloa.

10ainternal transcribed spacer10amorphological analysis10aphylogenetic analysis10apsbA-trnH10astomatal complex1 aTrofimov, Dimitrij1 aRohwer, Jens, G. uhttps://lauraceae.myspecies.info/node/20376