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66 results for “Hamamelis”
Hamamelis vernalis (Hamamelidaceae) - bark - of a small tree or small branch
Image of Hamamelis vernalis (Hamamelidaceae) - bark - of a small tree or small branch
Hamamelis virginiana (Hamamelidaceae) - twig - orientation of petioles
Image of Hamamelis virginiana (Hamamelidaceae) - twig - orientation of petioles
Hamamelis vernalis (Hamamelidaceae) - twig - orientation of petioles
Image of Hamamelis vernalis (Hamamelidaceae) - twig - orientation of petioles
Hamamelis vernalis (Hamamelidaceae) - whole tree (or vine) - general
Image of Hamamelis vernalis (Hamamelidaceae) - whole tree (or vine) - general
Hamamelis vernalis (Hamamelidaceae) - bark - of a medium tree or large branch
Image of Hamamelis vernalis (Hamamelidaceae) - bark - of a medium tree or large branch
Hamamelis vernalis (Hamamelidaceae) - twig - orientation of petioles
Image of Hamamelis vernalis (Hamamelidaceae) - twig - orientation of petioles
Hamamelis virginiana (Hamamelidaceae) - inflorescence - lateral view of flower
Image of Hamamelis virginiana (Hamamelidaceae) - inflorescence - lateral view of flower
Hamamelis virginiana (Hamamelidaceae) - inflorescence - frontal view of flower
Image of Hamamelis virginiana (Hamamelidaceae) - inflorescence - frontal view of flower
Hamamelis virginiana (Hamamelidaceae) - bark - of a small tree or small branch
Image of Hamamelis virginiana (Hamamelidaceae) - bark - of a small tree or small branch
Hamamelis virginiana (Hamamelidaceae) - inflorescence - whole - unspecified
Image of Hamamelis virginiana (Hamamelidaceae) - inflorescence - whole - unspecified
Hamamelis virginiana (Hamamelidaceae) - leaf - margin of upper + lower surface
Image of Hamamelis virginiana (Hamamelidaceae) - leaf - margin of upper + lower surface
Hamamelis vernalis (Hamamelidaceae) - leaf - margin of upper + lower surface
Image of Hamamelis vernalis (Hamamelidaceae) - leaf - margin of upper + lower surface
Hamamelis virginiana (Hamamelidaceae) - inflorescence - lateral view of flower
Image of Hamamelis virginiana (Hamamelidaceae) - inflorescence - lateral view of flower
Hamamelis vernalis (Hamamelidaceae) - leaf - showing orientation on twig
Image of Hamamelis vernalis (Hamamelidaceae) - leaf - showing orientation on twig
Hamamelis vernalis (Hamamelidaceae) - leaf - whole upper surface
Image of Hamamelis vernalis (Hamamelidaceae) - leaf - whole upper surface
Harvard Forest site, station Harvard Forest's Lyford Blocks within the Prospect Hill Tract, study of diameter at breast height of Hamamelis virginiana in units of centimeter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Harvard Forest (HFR) contains diameter at breast height of Hamamelis virginiana measurements in centimeter units and were aggregated to a yearly timescale.
Phylogenomics and biogeography of Castanea (chestnut) and Hamamelis (witch-hazel): Choosing between RAD-seq and Hyb-Seq approaches
<p>Target enrichment and RAD-seq are well-established high throughput sequencing technologies that have been increasingly used for phylogenomic studies. Each method has its own pros and cons. The choice between them is a practical issue for plant systematists studying the evolutionary histories of biodiversity of relatively recent origins. However, few studies have compared the congruence and conflict between results from the two methods within the same group of organisms in plants. In this study, we employed RAD-seq and Hyb-Seq of Angiosperm 353 genes in phylogenomic and biogeographic studies of <em>Hamamelis</em> (the witch-hazels) and <em>Castanea </em>(chestnuts), two classic examples exhibiting the well-known eastern Asian (EA)-eastern North American (ENA) disjunct distribution, and compared them side by side. Our results showed congruences in phylogenetic inference and divergence time dating between the two data sets obtained through our customized procedures of library preparation and sequence trimming, although they differed in the number of loci and informative sites, the amount of missing data, and sampling within species. We suggest the selection of the two methods based on fund availability and sampling scale. Our phylogenetic analyses of RAD-seq and Hyb-Seq data resulted in well-resolved species relationships, and ancient introgressions were revealed in both genera by D-statistic test and PhyloNet. Biogeographic analyses including fossil data using total evidence-based dated tree and DEC model, applying specific inter-area dispersal probabilities, revealed a complicated history for each genus, indicating multiple intercontinental dispersals and local extinctions in areas outside of the taxa's modern ranges in both the Paleogene and Neogene. The study demonstrates the importance of including fossil taxa for a more accurate reconstruction of biogeographic histories of taxa to understand the EA and ENA floristic disjunction. Our results support an "out of western North America" migration of <em>Castanea</em> but an "out of Asia" migration of <em>Hamamelis</em> during their initial diversification, and the origins of the EA-ENA disjunction in both genera were results of vicariance.</p>
Phylogenomics and biogeography of Castanea (chestnut) and Hamamelis (witch-hazel): Choosing between RAD-seq and Hyb-Seq approaches
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Hamamelis virginiana L. (BR0000024491365)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Hamamelis virginiana L. (BR0000015255099V)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
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