Systematic Botany最新文献

{"title":"Novelties in Oocephalus (Hyptidinae, Lamiaceae) from Central Brazil: Two New Species from Chapada dos Veadeiros National Park","authors":"Arthur de Souza Soares, R. Harley, José Floriano BARÊA PASTORE, J. Jardim","doi":"10.1600/036364422X16512564801588","DOIUrl":"https://doi.org/10.1600/036364422X16512564801588","url":null,"abstract":"Abstract Two new species of Oocephalus (Ocimeae: Hyptidinae), O. griseus and O. campestris, from the Chapada dos Veadeiros National Park (CVNP), in Goiás state, Brazil, are proposed. For each species, description and comments on distribution and taxonomy are provided. Also, a diagnostic key to all Oocephalus species occurring in the state of Goiás and Distrito Federal is provided, as well as a line drawing and illustrated photographs of the new species.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47231875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Genetic Diversity of Triploid Celtis pumila and its Diploid Relatives C. occidentalis and C. laevigata (Cannabaceae)","authors":"Andrew Hayes, Song Wang, A. Whittemore, T. Smith","doi":"10.1600/036364422X16512564801713","DOIUrl":"https://doi.org/10.1600/036364422X16512564801713","url":null,"abstract":"Abstract The genus Celtis in eastern North America shows puzzling patterns of variation. While three species are generally recognized, many authors have suggested hybridization may be blurring the boundaries among them. Suspected hybridization between C. occidentalis and C. pumila has hampered conservation planning for the latter, which is a Threatened species in Canada. Using microsatellite markers and flow cytometry, we assessed the relationship between genetic diversity, ploidy, and morphology in this group. We confirmed the presence of two diploid species, C. occidentalis and C. laevigata, and that they do hybridize where they co-occur in southern Missouri and Illinois. We found two triploid genetic groups. These groups had distinct geographic ranges, but were morphologically very similar, corresponding to C. pumila. Furthermore, the triploid groups were characterized by a small number of heterozygous multi-locus genotypes. A single genotype dominated populations across Ontario, Michigan, Ohio, and Pennsylvania, indicating apomictic reproduction is common in these groups. While the triploid clusters were distinct from each other, they did have strong associations with sympatric diploid species, and also with the western triploid species C. reticulata. However, we found no evidence of hybridization or gene flow between diploid C. occidentalis and triploid C. pumila. This removes hybridization and introgression as a complicating issue for conservation management. The intermediate forms observed are a demonstration of remarkable phenotypic plasticity, with the same triploid genotype variously presenting as dwarf shrubs in xeric, exposed sites, and subcanopy trees in mesic forests.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47869596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two New Endemic Tetraploid Species of the Genus Isoëtes from the Brazilian Savanna","authors":"Jovani B. S. Pereira, J. Prado","doi":"10.1600/036364422X16512564801704","DOIUrl":"https://doi.org/10.1600/036364422X16512564801704","url":null,"abstract":"Abstract Isoëtes cipoensis and I. longifolia, two new endemic tetraploids from the Cerrado (Brazilian savanna), are described, illustrated, and compared to their similar species. Isoëtes cipoensis can be distinguished by a set of characters such as flaccid, straight, and erect leaves, deltate labia, presence of conspicuous sclerified phyllopodia, baculate megaspores with frequent long spine-like macroelements, and distally echinate microspores. Isoëtes longifolia is characterized by having a fully submerged habitat in the river, flaccid, long leaves (70–100 cm long), oblong labia, uniformly baculate megaspores, and densely echinate microspores. Importantly, chloroplast genomes already published for the species further support their phylogenetic distinctness in comparison to other species from the tropical region in Brazil. This study provides a key and distribution map for the species from the Brazilian savanna and scanning electron microscopy images of the mega- and microspores for the new species. These species are only known from their type location. We suggest I. cipoensis and I. longifolia should be classified as Data Deficient (DD) and Endangered (EN) species, respectively, based on the IUCN criteria.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48638184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artemisia lanaticapitula (Asteraceae: Tribe Anthemideae), a New Species from Zhejiang, East China","authors":"Yi‐Fei Lu, Wen-Yuan Xie, HUA-DONG Li, ZHENG-HAI Chen, Xiao‐Feng Jin","doi":"10.1600/036364422X16512564801524","DOIUrl":"https://doi.org/10.1600/036364422X16512564801524","url":null,"abstract":"Abstract Artemisia lanaticapitula (Asteraceae: Anthemideae), a new species from Zhejiang in East China, is described and illustrated, based on the analyses of morphological observations and molecular phylogenetic evidence. This new species is similar to Artemisia anomala in having simple and undivided leaves, but differs by having phyllaries, corolla limbs, and abaxial leaf surfaces densely white-lanate, an involucre that is semiglobose, 3.5–6 mm in diameter, and capitulate pedunculate at the base. It grows along streams under forests or on roadsides at forest margins; the species is narrowly distributed in Eastern and Southern Zhejiang.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48817443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Siphocampylus flavescens (Campanulaceae, Lobelioideae), a New Endangered Species from Southeastern Brazil","authors":"G. P. Coelho, João Ricardo VIEIRA IGANCI, Silvia Teresinha Sfoggia Miotto","doi":"10.1600/036364422X16512564801597","DOIUrl":"https://doi.org/10.1600/036364422X16512564801597","url":null,"abstract":"Abstract Siphocampylus flavescens is a new species endemic from the Serra Negra region, in the Serra da Mantiqueira complex, in Minas Gerais state, Brazil. It is characterized mainly by being a polycarpic decumbent subshrub, with whorled phyllotaxis (usually three leaves per node), and by its entirely yellow corolla, which differentiates S. flavescens from all other Brazilian species of Siphocampylus. Morphologically, it is more related to S. fluminensis, from which it can be distinguished mainly by the entirely yellow corolla (vs. bicolor, with the tube reddish and the lobes yellowish or greenish). Minor differences include the equally denticulate leaf margin, with reduced teeth, the reduced widely obconic hypanthium, and the rounded capsule of S. flavescens (unequally denticulate to fimbriate leaf margin, larger obconic hypanthium, and obconic capsules in S. fluminensis). The new taxon is here described. We provide a distribution map, photographs, and an identification key to the Siphocampylus species found in Minas Gerais state. We also informally propose the inclusion of S. flavescens in the IUCN Red List as an Endangered (EN) species due its small area of occurrence and the growing human impact in the region.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41385273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights into Species Delimitation of Selected Species in the Flowering Plant Genus Medicago Section Buceras (Leguminosae)","authors":"Julia E. Steier, T. Mandáková, M. Wojciechowski, K. Steele","doi":"10.1600/036364422X16512564801533","DOIUrl":"https://doi.org/10.1600/036364422X16512564801533","url":null,"abstract":"Abstract The genus Medicago (Leguminosae, Papilionoideae) contains about 90 species including the important forage crop alfalfa Medicago sativa and the genomic model Medicago truncatula. Despite intensive research on the genus because of its agricultural importance, there is a relative lack of information about chromosome number and genome size in some Medicago species, especially those from Medicago section Buceras that were formerly placed in the sister genus Trigonella, and are paraphyletic to the remainder of the genus Medicago. Past studies revealed that previous species delimitations did not conform well with complex patterns of morphological or genetic variation. Some published chromosome numbers, e.g. 2n = 28 and 2n = 44, differ from those of the rest of the genus, which are mostly 2n = 16 or polyploids thereof, although some cases of aneuploid reduction or dysploidy (e.g. 2n = 14) do exist. Here we estimated phylogenetic relationships of 42 accessions corresponding to 14 currently recognized Medicago species that are paraphyletic to the remainder of Medicago with a focus on Medicago monantha; for a number of those accessions we obtained estimates of genome size (39) and chromosome number (14). We can confirm the delimitation of two species within M. section Buceras and our data suggest that there are at least two entities with distinct geographic distributions within the currently recognized species M. monantha, which differ in chromosome number and genome size. Our data also suggest that polyploidy and post-polyploid descending dysploidy played a significant role in genome evolution within M. section Buceras. Our data provide a strong foundation for whole-genome sequencing projects and further in-depth research of these paraphyletic lineages.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46105664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphological and Molecular Evidence Support Elevating Erythroxylum macrophyllum var. savannarum (Erythroxylaceae) to Specific Status","authors":"O. A. Jara-Muñoz, D. White, Orlando Rivera-Díaz","doi":"10.1600/036364422X16512572274990","DOIUrl":"https://doi.org/10.1600/036364422X16512572274990","url":null,"abstract":"Abstract Erythroxylum macrophyllum is a morphologically variable and widely distributed species complex in Central and South America with several sub-specific taxa and numerous species included in its synonymy. A single variety grows in the Colombo-Venezuelan savanna region which can be distinguished from the rest of the E. macrophyllum complex by the size of leaves, cataphyll and stipule characteristics, and shape of calyx lobes. A molecular phylogeny reconstructed from 519 nuclear genes also reveals that the savanna variety is more closely related to E. acuminatum and E. pauciflorum than E. macrophyllum. This phylogenomic evidence also suggests Erythroxylum sect. Macrocalyx, to which E. macrophyllum belongs, is a polyphyletic taxonomic section. We thus propose elevating this variety to specific status, as Erythroxylum savannarum. We provide an updated taxonomic description, information about its habitat and distribution, and justify its informal IUCN categorization of Near Threatened (NT).","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49168145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novelties in Calea sect. Meyeria (Asteraceae, Neurolaeneae) from Brazil","authors":"Vinicius R. Bueno, G. Heiden","doi":"10.1600/036364422X16512564801632","DOIUrl":"https://doi.org/10.1600/036364422X16512564801632","url":null,"abstract":"Abstract We herein present nomenclatural and taxonomic novelties in Calea sect. Meyeria from Brazil. Calea pruskiana is a new species related to C. triantha and can be distinguished by the acute or cuneate, rarely attenuate leaf apex (vs. obtuse), slightly branched capitulescence (vs. profusely branched), and ray florets 18–21.7 mm long (vs. 9.2–15.3 mm). Calea hispida f. subintegerrima is lectotypified, recombined, and elevated to species level as Calea subintegerrima, which also resembles C. triantha, however differs from it by the usually glabrous abaxial leaf surface (vs. usually hispid), glandular-punctate peduncle (vs. glands absent), and cypselae with hirsute ribs (vs. pilose ribs). These species are described and illustrated, their geographic distributions are mapped, and their taxonomic affinities are discussed. Furthermore, a new terminology is proposed to describe more accurately the pappus scale size variation according to the relative length of the scales and the occurrence of combinations of pappus scales of different lengths in the same capitulum.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43891050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Systematics, Species Concepts, and Myrmecophytism in Cecropia (Cecropieae: Urticaceae): Insights from Restriction-Site Associated DNA","authors":"E. Treiber, P. Zalamea, M. Torres, S. Madriñán, G. Weiblen","doi":"10.1600/036364422X16512564801605","DOIUrl":"https://doi.org/10.1600/036364422X16512564801605","url":null,"abstract":"Abstract Cecropia is a group of fast-growing pioneer trees that are important in forest regeneration and a common ant-plant mutualism in the Neotropics. To investigate the evolution of mutualism between Cecropia and associated ants, a phylogenetic framework is necessary. Cecropia species are difficult to distinguish morphologically and conventional genetic markers are insufficiently variable to resolve the phylogenetic relationships among species. Our study aimed to compare the phylogenetic utility of restriction site associated DNA (RAD) sequencing to prior work based on commonly sequenced gene regions. RAD sequence data resolved and supported species-level relationships better than previous studies. We identified a deeply divergent non-myrmecophytic clade including C. sciadophylla and African Musanga. Results from geographically widespread and morphologically heterogenous C. obtusifolia and C. angustifolia suggest that current synonymy has lumped phylogenetically divergent lineages. Reconstruction of ant associations on the highly supported Cecropia phylogeny inferred equal probability of the ancestor of Cecropia being myrmecophytic or not. More intensive genetic study is needed to refine species concepts in Cecropia.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49126705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Taxonomic Studies on Malagasy Dalbergia (Fabaceae). III. Two New Species from Southeastern Madagascar and an Emended Description of the Rosewood Species Dalbergia maritima","authors":"S. Crameri, P. Phillipson, Nivo Rakotonirina, N. Wilding, R. L. Andriamiarisoa, P. Lowry, A. Widmer","doi":"10.1600/036364422X16512564801614","DOIUrl":"https://doi.org/10.1600/036364422X16512564801614","url":null,"abstract":"Abstract The Malagasy rosewood species Dalbergia maritima has a long history of unsustainable exploitation for its beautiful, burgundy-colored heartwood. As currently circumscribed, D. maritima has a wide geographic distribution in eastern Madagascar and exhibits significant morphological, ecological, and genetic variation, suggesting it may comprise more than a single entity. Multivariate analyses of leaf, flower, and inflorescence characters as well as eco-geographic features reveal several morphologically well delimited entities with distinct habitat preferences and/or geographic ranges, which are consistent with results from recent phylogenomic and population genomic studies of Malagasy Dalbergia. Based on these findings, we describe and illustrate two new species from southeastern Madagascar comprising material previously assigned to D. maritima, viz. D. pseudomaritima, characterized by paniculate inflorescences and small, broadly elliptic to orbicular, glabrous leaflets, and D. razakamalalae, distinguished by racemose inflorescences with large flowers, and narrowly ovate to narrowly elliptic, glabrous leaflets. Dalbergia maritima is consequently re-circumscribed to include only populations from east-central Madagascar, within which we recognize two subspecies, D. maritima subsp. maritima, with glabrous leaves, inflorescence axes, and gynoecia, occurring in littoral forest habitats, and D. maritima subsp. pubescens, with indument on these structures, and growing in evergreen humid forest farther inland. Photos are provided for each taxon, along with line drawings for the two new species. Provisional IUCN Red List assessments indicate that all three species are Endangered, D. maritima and D. razakamalalae mainly because of selective logging for trade in their high-quality heartwood, and D. pseudomaritima primarily because of habitat degradation due to land clearing and fire for subsistence agriculture, which has important implications for their conservation and sustainable management.","PeriodicalId":54438,"journal":{"name":"Systematic Botany","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43444520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}