Abstract
Rubus violaceifrons, a new species from central and north-eastern Bohemia (Czech Republic) is described and illustrated, and its distribution is characterized in detail. We classify it as a member of the series Pallidi of the subgenus Rubus, section Rubus and subsection Hiemales, although its weak specimens partly resemble R. guentheri from ser. Glandulosi. Like all species of R. ser. Pallidi studied so far, R. violaceifrons is tetraploid, as determined using flow cytometry. A detailed morphological comparison of the new bramble species with similar taxa is presented. A determination key including all taxa of the R. ser. Pallidi occurring in the Czech Republic is provided.
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Beek, A. van de (2017b) Rubus latior A. Beek – a new species of Rubus (Rosaceae) in France and in the Netherlands. Gorteria – Dutch Botanical Archives 39: 88–102.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Beek, A. van de (2018) Rubus serpens Weihe ex Lej. & Courtois (Rosaceae L.), with related taxa and names. Gorteria – Dutch Botanical Archives 40: 55–72.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Beek, A. van de & Meijer, K. (2017) Rubus psilops A. Beek & K. Meijer nov. spec. (Rosaceae L.) – a new bramble in the Netherlands and Germany. Gorteria – Dutch Botanical Archives 39: 53–62.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Beek, A. van de, Meijer, K. & Troelstra, A.S. (2019) Two new species of Rubus sect. Corylifolii Lindl. (Rosaceae) from the east of the Netherlands. Gorteria – Dutch Botanical Archives 41: 35–46.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Bluff, M.J. & Fingerhuth, C.A. (1825) Compendium florae Germaniae, Sectio I, Plantae phanerogamicae seu vasculosae, Vol. 1. J. L. Schrag, Nürnberg, 756 pp. Available from: https://hdl.handle.net/2027/hvd.32044107276545 (accessed 8 April 2021)</span></span></span>
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Doležel, J., Greilhuber, J. & Suda, J. (2007) Estimation of nuclear DNA content in plants using flow cytometry. Nature Protocols 2: 2233–2244. https://doi.org/10.1038/nprot.2007.310</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Drenckhahn, D. (2017) Rubus viridilucidus Drenckhahn, eine neue Brombeerart aus der Sektion Corylifolii, Serie Subcanescentes. Forum Geobot. 7: 34–42.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"> https://doi.org/10.3264/FG.2017.1221 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Drenckhahn, D., Jansen, W. & Weber, H.E. (2018) Rubus pseudoglotta Drenckhahn & W. Jansen, eine neue deutsch-dänische Brombeerart aus dem Formenkreis des Rubus phylloglota (Frid.) Å. Gust. Forum Geobot. 8: 15–23. https://doi.org/10.3264/FG.2018.1228</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Drenckhahn, D. & Weber, H.E. (2020) Die Nordfriesische Brombeere, Rubus boreofrisicus Drenckhahn & H.E. Weber, eine endemische Rubus-Art der Westküste von Schleswig-Holstein, Deutschland. Forum Geobot. 9: 66–69. https://doi.org/10.3264/FG.2020.0116</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Focke, W.O. (1877) Synopsis Ruborum Germaniae. Die deutschen Brombeerarten ausführlich beschrieben und erläutert. C. Ed. Müllers’s Verlagsbuchhandlung, Bremen, 434 pp.</span></span></span>
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