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2,408 results for “Centaurea”
Herbarium specimen image of Centaurea vavilovii Takht. & Gabrieljan, part of the collection of Botanic Garden and Botanical Museum Berlin
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.<br>- A lossless TIFF image from which the JPEG image has been derived.
Herbarium specimen image of Centaurea caroli-henrici Gabrieljan & Dittrich, part of the collection of Botanic Garden and Botanical Museum Berlin
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.<br>- A lossless TIFF image from which the JPEG image has been derived.<br>- Two PNG files containing segmented image overlays of the scanned herbarium sheet. The _all extension indicates that all labels, color charts and pieces of text have received a different color against a black background color. The _sel extension indicates that these elements are white if they're barcode labels, yellow if they're color charts and red if they're anything else.
Herbarium specimen image of Centaurea ochrocephala Wagenitz, part of the collection of Botanic Garden and Botanical Museum Berlin
Part of a training dataset of scanned herbarium specimens. The data paper and a summary landing page will be published on Zenodo as it gets published.<br><br>Content of this deposition:<br><br>- A JSON-LD datafile listing the label data associated with this herbarium specimen. The Darwin and Dublin Core data standards are used for most values.<br>- A JPEG image file of the scanned herbarium sheet.<br>- A lossless TIFF image from which the JPEG image has been derived.
The influence of environmental factors on the distribution and density of invasive Centaurea stoebe across Northeastern USA, 2013 - 2018
Centaurea stoebe (Asteraceae; spotted knapweed) is an emerging invader in northeast US, and is a major invasive plant in the northern Midwest and western USA. Although it has been present in New York State (NYS) for over 100 years, its apparent recent population increases and spread provide a rare opportunity to study a plant in the early stages of invasion. Therefore, a study was carried out understand how distinct environmental factors influence the distribution, density and change in density C. stoebe at different spatial scales within its novel range in the northeastern USA. First, we collected field data on the occurrence, density and change in density of this species in North Eastern United States, from 2013 to 2014. Then, using species distribution models, we assessed the potential influence of environmental factors on the invasion of spotted knapweed in northeast US. Within different parts of C. stoebe‘s range, different factors explained its occurrence, density and change in density over 2 years. Across northeast US, climate and soil factors were the most influential predictors explaining C. stoebe‘s distribution, while within Long Island in southeastern NYS and the Adirondack Mountains in northern NYS, precipitation and disturbance respectively were the most important. These results are published in the paper titled The influence of environmental factors on the distribution and density of invasive Centaurea stoebe across Northeastern USA (Akin-Fajiye and Gurevitch, 2018).
Genomic analyses of phenotypic differences between native and invasive populations of diffuse knapweed (Centaurea diffusa)
<p>Invasive species represent excellent opportunities to study the evolutionary potential of traits important to success in novel environments. Although some ecologically-important traits have been identified in invasive species, little is typically known about the genetic mechanisms that underlie invasion success in non-model species. Here, we use a genome-wide association (GWAS) approach to identify the genetic basis of trait variation in the non-model, invasive, diffuse knapweed (<i>Centaurea diffusa </i>Lam.<i> </i>[Asteraceae]). To assist with this analysis, we have assembled the first draft genome reference and fully annotated plastome assembly for this species, and the one of the first from this large, weedy, genus, which is of major ecological and economic importance. We collected phenotype data from 372 individuals from four native and four invasive populations of <i>C. diffusa </i>grown in a common environment. Using these individuals, we produced reduced-representation genotype-by-sequencing (GBS) libraries and identified 7058 SNPs. We identify two SNPs associated with leaf width in these populations, a trait which significantly varies between native and invasive populations. In this rosette forming species, increased leaf width is a major component of increased biomass, a common trait in invasive plants correlated with increased fitness. Finally, we use annotations from <i>Arabidopsis thaliana</i> to identify 98 candidate genes that are near the associated SNPs and highlight several good candidates for leaf width variation.</p>
Centaurea cyanus (Asteraceae) - leaf - basal or on lower stem
Image of Centaurea cyanus (Asteraceae) - leaf - basal or on lower stem
Centaurea cyanus (Asteraceae) - leaf - on upper stem
Image of Centaurea cyanus (Asteraceae) - leaf - on upper stem
Centaurea cyanus (Asteraceae) - inflorescence - whole - unspecified
Image of Centaurea cyanus (Asteraceae) - inflorescence - whole - unspecified
Centaurea cyanus (Asteraceae) - whole plant - in flower - general view
Image of Centaurea cyanus (Asteraceae) - whole plant - in flower - general view
Centaurea cyanus (Asteraceae) - stem - showing leaf bases
Image of Centaurea cyanus (Asteraceae) - stem - showing leaf bases
Centaurea cyanus (Asteraceae) - inflorescence - whole - unspecified
Image of Centaurea cyanus (Asteraceae) - inflorescence - whole - unspecified
FIG. 1 in Neotypification of the name Centaurea crassifolia Bertol. (Asteraceae)
FIG. 1. — Neotype of Centaurea crassifolia Bertol. at CAT (S. Brullo & G. Ronsisvalle 006836). Image from CAT with acknowledgement.
Fig. 1 in A new name in Centaurea (Asteraceae, Cardueae) from Turkey
Fig. 1. – Details of holotype of Centaurea zaferii Negaresh (Ξ C. foliosa Boiss. & Kotschy) in G-BOIS. A. Habit; B. Inflorescence; C. basal leaf.
Centaurea calcitrapa L. (BR0000012506194)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Centaurea calcitrapa L. (BR0000010738245)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Centaurea calcitrapa L. (BR0000010740637)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Centaurea calcitrapa L. (BR0000010738894)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Centaurea calcitrapa L. (BR0000010739136)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Centaurea calcitrapa L. (BR0000010739945)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Centaurea calcitrapa L. (BR0000010739297)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
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