Rueppell Herbarium

From ancient herbals to modern information hubs – research and applications on the flora of Germany

Herbaria are among the oldest parts of the collections in natural history museums. Senckenberg’s oldest herbarium, a showpiece bound in the fashion of a herbal book, dates back to the year 1677. In the course of digitization, our collections are not only brought to a broader public’s attention, they also garner new scientific interest.

Beginning in the early 19th century, natural history collections have been designed and systematically extended with an eye on scientific questions. Over time, they underwent changes; generally, the requirements regarding research collections have become increasingly more diverse.

Research on and with herbaria

While the traditional herbarium specimen still constitutes the centerpiece of our work, the classic methods of examination with a magnifying glass or the microscope have been augmented by new methods such as DNA analyses and Xray studies. Besides taxonomic issues, our interest today also includes applied aspects such as nature conservation, where changes in the flora in connection with climate or land use change are of particular concern.

At the research locations in Frankfurt, Görlitz, Weimar, and Wilhelmshaven, the Herbarium Senckenbergianum maintains large collections pertaining to the German flora. Our work emphasizes basic research regarding systematics and evolution, including species groups such as hawkweeds, grasses, or most recently, the rose family. An important applied aspect in this regard is the pre paration of identification keys, particularly for taxonomically difficult groups. In addition, floristics, i. e., the recording and documentation of the occurrence of important species, constitute a central task. In this context, herbarium specimens continue to be the most reliable vouchers, which can be traced back over centuries.

Virtual herbaria and botanical online portals

In the course of digitization, the fields of identification aids and floristics have experienced a strong upsurge at Senckenberg. As early as 2010, Senckenberg started to operate the “Flora of Frankfurt” online portal, where interested citizens can report their observations of plants within the urban district as well as querying information. Görlitz also has a central contact point for regional floristics. Here, observation data are available via the local citizen science network, the working group of Saxonian botanists, and the responsible state office. As an important reference, Senckenberg Görlitz recently launched the “Virtual Herbarium of Lusatia.” It contains reliably identified specimens of all taxa that occur in Upper Lusatia (i. e., species, subspecies, and occasionally also varieties) in the form of high-resolution photographs – available to anyone at no cost. This is the first completely illustrated online flora for a region in Germany.


Online help even in difficult cases

With two out of four editors, Senckenberg also plays a key role in the continued publication of the “Rothmaler.” The “Excursion Flora of Germany” is likely the most comprehensive work for identifying the local plant life. The identification keys in the “Rothmaler” are considered the standard authority, especially in regard to difficult species groups. Nevertheless, in these taxonomically critical groups the comparison with identified material from herbaria continues to be necessary. While it was required in the past to personally visit large herbaria to achieve this, it can now be done from a home computer. Moreover, Senckenberg also operates a specialized online flora for hardtoidentify groups in close cooperation with the Haussknecht Herbarium at the Friedrich Schiller University in Jena. The online flora offers detailed photographs of identificationrelevant characteristics in addition to a virtual herbarium. In another online portal the chromosome numbers of plants of the German flora are presented. This portal was launched in 2015.

In view of the biodiversity crisis, offerings such as these gain increasing importance; therefore, we continually expand our digital resources. Those not content with simply looking at their computer screen are still welcome to visit our collections. The herbarium voucher specimens will continue to maintain their “real” value for basic research and environmental issues.


Dr. Stefan Dressler †
Sektionsleiter Phanerogamen II


  • Taxonomie und Evolution ausgewählter Samenpflanzengruppen
  • Geschichte der Botanik und der Senckenbergischen botanischen Sammlungen Frankfurt/M. (FR)


  • Systematik, Biogeografie und Evolution der Marcgraviaceae
  • Taxonomie neotropischer Pentaphylacaceae und Theaceae
  • Digitalisierung der Typen und historischen Sammlungen des Herbarium Senckenbergianum Frankfurt/M. (FR)
  • Flora von Westafrica (insbes. Burkina Faso)
  • Determination mittels Fotos: Fotodatenbank African Plants – A Photo Guide
  • Portal zur Identifikation bestimmungskritischer Sippen der deutschen Flora

Projekte für Examenskandidaten aus den genannten Themenbereichen sind generell möglich (zurzeit bin ich nicht im Dienst).

1990  Diplom Biologie Humboldt-Universität Berlin
1994  Dr. rer. nat. Museum für Naturkunde, Humboldt-Universität Berlin
1994-1996  PostDoc Rijksherbarium Leiden, Niederlande
1997-  Sektionsleiter Phanerogamen II, Senckenberg Forschungsinstitut Frankfurt/M.

Ausgewählte Publikationen

Borsch, T., Stevens, A.-D., Häffner, E., Güntsch, A., Berendsohn, W. G., Appelhans, M. S., Barilaro, C., Beszteri, B., Blattner, F. R., Bossdorf, O., Dalitz, H., Dressler, S., Duque-Thüs, R., Esser, H.-J., Franzke, A., Goetze, D., Grein, M., Grünert, U., Hellwig, F., Hentschel, J., Hörandl, E., Janßen, T., Jürgens, N., Kadereit, G., Karisch, T., Koch, M. A., Müller, F., Müller, J., Ober, D., Porembski, S., Poschlod, P., Printzen, C., Röser, M., Sack, P., Schlüter, P., Schmidt, M., Schnittler, M., Scholler, M., Schultz, M., Seeber, E., Simmel, J., Stiller, M., Thiv, M., Thüs, H., Tkach, N., Triebel, D., Warnke, U., Weibulat, T., Wesche, K., Yurkov, A., Zizka, G. (2020). A complete digitization of German herbaria is possible, sensible and should be started now. Research Ideas and Outcomes 6: e50675. [publ. 03 Feb 2020]

Kattge, J., Bönisch, G., Díaz, S. et al. (darunter Dressler, S., Gregor, T., Paule, J., Zizka, G.) (2020). TRY plant trait database – enhanced coverage and open access. Global Change Biology 26 (1): 119-188. [first publ. online: 31 Dec 2019]

Bruelheide, H., Dengler, J., Jiménez-Alfaro, B. et al. (darunter M. Schmidt, S. Dressler, K. Wesche, G. Zizka) (2019). sPlot – a new tool for global vegetation analyses. Journal of Vegetation Science 30 (2): 161-186. Doi: 10.1111/jvs.12710 [publ. 4 Feb 2019]

B F G – The Brazil Flora Group (darunter S. Dressler) (2018). Brazilian Flora 2020: Innovation and collaboration to meet Target 1 of the Global Strategy for Plant Conservation (GSPC). Rodriguésia 69 (4): 1513-1527.

Younis, S., Weiland, C., Hoehndorf, R., Dressler, S., Hickler, T., Seeger, B., Schmidt, M. (2018). Taxon and trait recognition from digitized herbarium specimens using deep convolutional neural networks. Botany Letters 165 (3/4): 377-383. [publ. 13 Mar 2018)

Hoehndorf, R., Weiland, C., Schmidt, M., Groom, Q., Gosline, G., Dressler, S., Hamann, T. (2018). The Flora Phenotype Ontology (FLOPO) and the FLOPO knowledge base. In: Thessen, A. E. [ed.]: Application of Semantic Technologies in Biodiversity Science. Studies on the Semantic Web, IOS Press/AKA Verlag. Pp. 105-117.

Dressler, S. (2018 Mar 30). Tetrameristaceae in Flora do Brasil 2020 em construção. Jardim Botânico do Rio de Janeiro. Disponible in: <>.

Dressler, S. (2017 Mar 30). Marcgraviaceae in Flora do Brasil 2020 em construção. Jardim Botânico do Rio de Janeiro. Disponible in: <>.

Dressler, S., Gregor, T., Hellwig, F.H., Korsch, H., Wesche, K., Wesenberg, J. Ritz, C. M. (2017). Comprehensive – and reliable – a new virtual herbarium of critical plant taxa in Germany. Plant Systematics and Evolution 303 (8): 1109-1113. Doi: 10.1007/s00606-017-1419-6 [publ. online 26 Apr 2017]

Schmidt, M., Zizka, A., Traoré, S., Ataholo, M., Chatelain, C., Daget, P., Dressler, S., Hahn, K., Kirchmair, I., Krohmer, J., Mbayngone, E., Müller, J. V., Nacoulma, B., Ouédraogo, A., Ouédraogo, O., Sambaré, O., Schumann, K., Wieringa, J., Zizka, G., Thiombiano, A. (2017). Diversity, distribution and preliminary conservation status of the flora of Burkina Faso. Phytotaxa 304 (1): 1-215. [monograph, publ. 18 Apr 2017]

Chartier, M., Dressler, S., Schönenberger, J., Rojas Mora, A., Sarthou, C., Wang, W., Jabbour, F. (2016). The evolution of afro-montane Delphinium (Ranunculaceae): morphospecies, phylogenetics and biogeography. Taxon 65 (6): 1313-1327.

Paule, J., Gregor, T., Schmidt, M., Gerstner, E.-M., Dersch, G., Dressler, S., Wesche, K., Zizka, G. (2016). Chromosome numbers of the flora of Germany – a new online database of georeferenced chromosome counts and flow cytometric ploidy estimates. Plant Systematics and Evolution 303 (8): 1123-1129. Doi: 10.1007/s00606-016-1362-y [publ. online 9 Nov 2016]

Giraldo-Cañas, D., Dressler, S. (2016). Marcgraviaceae. In: Bernal, R., Gradstein, R., Celis, M. [eds.]: Catálogo de las plantas y líquenes de Colombia, vol. 2: 1580-1584. Universidad Nacional de Colombia, Bogotá.

Barkworth, M. E., Watson, M., Barrie, F. R., Belyaeva, I. V., Chung, R. C. K., Dašková, J., Davidse, G., Dönmez, A. A., Doweld, A. B., Dressler, S., Flann, C., Gandhi, K., Geltman, D., Glen, H. F., Greuter, W., Head, M. J., Jahn, R., Janarthanam, M. K., Katinas, L., Kirk, P. M., Klazenga, N., Kusber, W.-H., Kvaček, J., Malécot, V., Mann, D. G., Marhold, K., Nagamasu, H., Nicolson, N., Paton, A., Patterson, D. J., Price, M. J., Prud’homme van Reine, W. F., Schneider, C. W., Sennikov, A., Smith, G. F., Stevens, P. F., Yang, Z.-L., Zhang, X.-C., Zuccarello, G .C. (2016). (276–279) Proposals to provide for registration of new names and nomenclatural acts. Taxon 65: 656-658.

Gregor, T., Dressler, S., Nierbauer, K.-U., Zizka, G. (2016). Loss of plant species diversity in a rural German region – assessment on basis of a historical herbarium. Tuexenia 36: 191-204. Doi: 10.14471/2016.36.013

Zizka, A., Thiombiano, A., Dressler, S., Nacoulma, B. M. I., Ouédraogo, A., Ouédraogo, I., Ouédraogo, O., Zizka, G., Hahn, K., Schmidt, M. (2015). Traditional plant use in Burkina Faso (West Africa): a national-scale analysis with focus on traditional medicine. Journal of Ethnobiology and Ethnomedicine 11:9. Doi:10.1186/1746-4269-11-9 [19 Feb 2015]

Schneider, J. V., Paule, J., Gitai, J., Dressler, S., Silva Gusmão, C. L., Benko-Iseppon, A. M. (2015). Divergent genome sizes reflect the infrafamilial subdivision of the neotropical woody Marcgraviaceae. Botanical Journal of the Linnean Society 177: 1-14.

Crespo, M. B., Pena-Martín, C., Becker, A. S., Dressler, S. (2015). Type designation for Cyclachaena xanthiifolia (Euphrosyne xanthiifolia) (Heliantheae, Asteraceae). Phytotaxa 197 (2): 132-138.

Zizka, A., Thiombiano, A., Dressler, S., Nacoulma, B. M. I., Ouédraogo, A., Ouédraogo, I., Ouédraogo, O., Zizka, G., Hahn, K., Schmidt, M. (2015). The vascular plant diversity of Burkina Faso (West Africa) – a quantitative analysis and implications for conservation. Candollea 70: 9-20.

Dressler, S., Repplinger, M., Bayer, C. (2014). Linaceae. In: Kubitzki, K. [ed.]: The Families and Genera of Vascular Plants, vol. 11. Flowering Plants Eudicots Malpighiales. Pp. 237-246. Springer, Berlin etc.

Dressler, S., Schmidt, M., Zizka, G. (2014). Introducing African Plants – A Photo Guide – An interactive photo database and rapid identification tool for continental Africa. Taxon 63 (5): 1159-1161. [29 Oct 2014]

Dressler, S. (2014). Marcgraviaceae. In: Jørgensen, P. M., Nee, M. H., Beck, S. G. [eds.]: Catálogo de las Plantas Vasculares de Bolivia (= Monographs in Systematic Botany 127), 1: 823-825. Missouri Botanical Garden Press.

Thiombiano, A., Schmidt, M., Dressler, S., Ouédraogo, A., Hahn, K., Zizka, G. (2012). Catalogue des plantes vasculaires du Burkina Faso. Boissiera 65. Conservatoire et Jardin botaniques, Genève.

Li, Y., Dressler, S., Zhang, D., Renner, S. S. (2009). More Miocene dispersal between Africa and Asia – the case of Bridelia (Phyllanthaceae). Systematic Botany 34 (3): 521-529.

Lens, F., Dressler, S., Jansen, S., van Evelghem, L., Smets, E. (2005). Relationships within balsaminoid Ericales: a wood anatomical approach. American Journal of Botany 92 (6): 941-953.

Lens, F., Dressler, S., Vinckier, S., Janssens, S., Dessein, S., Van Evelghem, L., Smets, E. (2005). Palynological variation in balsaminoid Ericales. I. Marcgraviaceae. Annals of Botany 96: 1047-1060.

Tschapka, M., Dressler, S. (2002). Chiropterophily: On bat-flowers and flower bats. Curtis’s Botanical Magazine, ser. 6, 19 (2): 114-125.

Dressler, S. (2001). Marcgraviaceae. In: Steyermark, J. A., Berry, P. E., Yatskievych, K., Holst, B. K. [eds.]: Flora of the Venezuelan Guayana, vol. 6: 248-260.

Dressler, S. (1996). The genus Bridelia Willd. (Euphorbiaceae) in Malesia and Indochina – A regional revision. Blumea 41: 263-331.

Dr. Christiane Ritz
Prof. Dr. Christiane Ritz
Abteilungsleiterin Botanik sowie Sektionsleiterin Phanerogamen II


Honorarprofessur an der TU Dresden (IHI Zittau)

Vollmitgliedschaft Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig

Habilitation “Polyploidy and hybridization in the genus Rosa L. (Rosaceae).” TU Dresden.

seit 2010
Sektionsleiterin Phanerogamen II; Senckenberg Museum für Naturkunde Görlitz

2009 – 2010
Wissenschaftliche Mitarbeiterin in der Abteilung Spezielle Botanik, Justus-Liebig-Universität Gießen, Deutschland

Evolution von Hundsrosen (Rosa L. sect. Caninae (DC.) Ser., Institut für Spezielle Botanik, Friedrich-Schiller-Universität Jena, Deutschland

Wissenschaftliche Mitarbeiterin am Institut für Spezielle Botanik, Friedrich-Schiller-Universität Jena, Deutschland 

Diplom in Biologie: Molecular, morphological and anatomical investigations on the phylogeny of the Meleuphorbia-complex of the genus Euphorbia L., Institut für Spezielle Botanik, Friedrich-Schiller-Universität Jena, Deutschland

1996 – 2002
Biologiestudium (Botanik, Genetik, Bodenkunde), TU Dresden      


Kalfusova, R., Herkotz, V., Kumke, K., Houben, A., Kovařík, A., Ritz, C.M., Lunerová, J. (2024) Epigenetic histone H3 phosphorylation marks discriminate between univalent and bivalent-forming chromosomes during the canina asymmetrical meiosis. Annals of Botany.

Mata-Sucre, Y., Parteka, L.M., Ritz, C.M., Gatica-Arias, A., Felix, L. P., Thomas, W.W., Souza, A.G., Vanzela A.L.L., Pedrosa-Harand, A., Marques, A. (2024) Oligo-barcode illuminates holocentric karyotype evolution in Rhynchospora (Cyperaceae). Frontiers in Plant Sciences 15.


Wesenberg, J., Gebauer, P., Wesche, K., Ritz, C.M. (2023) Hans-Werner Otto zum 90. Geburtstag. Berichte der Naturforschenden Gesellschaft der Oberlausitz 31: 189-192.

Baber, K., Ahlborn, J., Buschmann, S., Mitschke, M., Schröter, A., Düker, C., Peper, J., Ritz, C.M., Wesche, K. (2023) Zwischen Mooren, Sandheiden, Kiefernwäldern und Teichen – Das MoSaiKTeiL-Projekt im Hotspot „Oberlausitzer Heide- und Teichlandschaft“. Berichte der Naturforschenden Gesellschaft der Oberlausitz 31: 177-186.

Reichel K., Herklotz V., Smolka A., Nybom H., Kellner A., De Riek J., Smulders M.J.A., Wissemann V., CM R. (2023) Untangling the hedge: genetic diversity in clonally and sexually transmitted genomes of European wild roses, Rosa L. PLoS ONE, 18 (10), e0292634.

Ritz, C.M. (2023) Rosa L. in: Schmidt, P.A. & Schulz, B. (eds.) Fitschen Gehölzflora. 14th ed. Quelle & Meyer, Wiebelsheim

Gregor, T., Dressler, S., Klemm, S., Ritz, C.M., Schmidt, M., Wesche, K., Wesenberg, J., Zizka, G., Paule, J. (2023) The data portal “Chromosome numbers of the Flora of Germany”: progress after five years, recent developments, and future strategies. In Walker, J.M. Methods in Molecular Biology. Springer, Heidelberg.

Ritz C.M., Ulrich D., Buschmann S., Olbricht K. (2023) Variation in Volatile Organic Compounds in native, synanthropic accessions and cultivars of the musk strawberry (Fragaria moschata Duchesne ex Weston). PLoS ONE 18(8): e0289468.

Makuch, W.A., Wanke, S., Ditsch, B., Richter F., Herklotz, V., Ahlborn, J., Ritz, C. M. (2023) Population genetics and plant growth experiments as prerequisite for conservation measures of the rare European aquatic plant Luronium natans (Alismataceae). Front. Plant Sci. – Marine and Freshwater Plants 13.


Oyundelger, K., Munkhzul, O., Ritz, C.M., Wesche, K. (2022) Long-term grazing exclusion effects population genetics and functional traits of Artemisia frigida in Mongolia. Journal of Arid Environments 209: 104900.

Müller, F., Ritz, C.M., Welk, E., Aas, G., Dillenberger, M.S., Gebauer, S., Kropf, M., Wesche, K. (2022) Erläuterungen und Kommentare zu Neuerungen, Abweichungen von der Standardliste der Gefäßpflanzen Deutschlands sowie zu Gattungs- und Artkonzepten in der Rothmaler Exkursionsflora, Auflage 22. Schlechtendalia, 22: 180-219.

Reise, H., Ritz, C.M., Ritz, M., Baber, K. (2022) Früh übt sich. Natur, Forschung, Museum − Das Senckenberg Wissenschaftsmagazin 152 (4-6): 83-85.

Hassler, M., Ritz, C.M. (2022) Gattung Rosa. In Hassler, M., Muer, T. Flora Germanica. Verlag Regionalkultur. Heidelberg: 739-749.

Smolka, A., Rätzel, S., Herklotz, V., Ritz, C.M. (2022) Zytologische und genetische Untersuchungen zu Viola epipsila, V. palustris und ihrer Hybride V. ×fennica. Kochia 15: 45-55.

Wesche, K., Gebauer, P., Otte, V., Ritz, C.M., Brozio, C., Hoffmann, C., , Schurig, A., (2022) 30 Jahre Gesellschaftsarbeit der Naturforschenden Gesellschaft der Oberlausitz: Botanik, 1990 – 2021. Ber. Naturf. Ges. Oberlausitz 30: 241-248

Ritz, C.M. (2022) Böhnert, W., Kleinknecht, U., Butler, K., Richter, F., Schmidt, P.A., Winter, S. (2021) Verzeichnis und Rote Liste der Pflanzengesellschaften Sachsens. Sächs. Landesamt für Umwelt, Landwirtschaft und Geologie. Ber. Naturf. Ges. Oberlausitz 30: 219

Ritz, C.M. (2022) Laudatio zur Ehrenmitgliedschaft von Dr. Siegfried Bräutigam. Sächs. Flor. Mitt. 24:105-107.
Dedek, M., Wesche, K., Ritz, C.M., Zinke, O. Brozio, C. (2022) Charakterisierung von Standorten ausgewählter Wintergrün-Arten in der Oberlausitz. Ber. Naturf. Ges. Oberlausitz 30: 57-76.


Müller, F., Ritz, C.M., Welk, E., Wesche, K. (2021). Rothmaler Exkursionsflora von Deutschland. Grundband. 22nd ed. Springer Spektrum, Heidelberg.

Herklotz, V., Kovařík, A., Wissemann, V., Lunerová, J., Vozárová, R., Buschmann, S., Olbricht, K., Groth, M., Ritz, C.M. (2021) Power and weakness of repetition – evaluating the phylogenetic signal from repeatomes in the family Rosaceae with two case studies from genera prone to polyploidy and hybridization (Rosa and Fragaria). Frontiers in Plant Science

Oyundelger K., Harpke, D., Herklotz; V., Troeva, E., Zheng, Z., Li, Z., Oyuntsetseg, B., Wagner, V., Wesche, K., Ritz, C.M. (2021) Phylogeography of Artemisia frigida (Anthemideae, Asteraceae) based on genotyping-by-sequencing and plastid DNA data:Migration through Beringia. Journal of Evolutionary Biology: 00: 1-17.

Olbricht K., Ulrich D., Waurich, V., Wagner H., Bicking D., Gerischer U., Drewes-Alvarez, R., Gong, X., Parniske M., Gompel N., Bräcker L., Bölke N., Lesemann, S., Buschmann, S., Ritz C.M., Gruner P., Pinker I., (2021). Breeding potential of underutilized Fragaria species. Acta Horticulturae. 139-146. 10.17660/ActaHortic.2021.1309.20.

Khurelpurev, O., Herklotz, V., Harpke, D., Batlai, O., Wesche, K., Ritz, C.M. (2021) Contrasting effects of local environment and grazing pressure on genetic diversity and structure of Artemisia frigida. Conservation Genetics.

Shukherdorj Baasanmunkh, Batlai Oyuntsetseg, Chuluunkhuyag Oyundari, Khurelpurev Oyundelger, Magsar Urgamal, Davaajav Darikhand, Nergui Soninkhishig, Dashzeveg Nyambayar, Khurelbaatar Khaliunaa, Zagarjav Tsegmed, Kechaykin, A. A., Shmakov, A. I., Erst, A. S., Friesen, N., Ritz, C. M., Wesche, K., Hyeok Jae Choi. (2021) The vascular plant diversity of Dzungarian Gobi in western Mongolia, with an annotated checklist. – Phytotaxa 501: 1-55.

Lorenz, J., Heinrich, R., Schneider, A., Schwager, M., Herklotz, V., Wesche, K., Ritz, C.M. (2021) Invasive populations of Spiraea tomentosa (Rosaceae) are genetically diverse but shrinking under increasing canopy cover. Plant Biology.

Vozárová, R., Herklotz, V., Kovařík, A., Tynkevich, Y.O., Volkov, R. A., Ritz, C.M., Lunerová. J. (2021) Ancient origin of two 5S rDNA families dominating in the genus Rosa and their behaviour in the canina-type meiosis. Frontiers in Plant Sciences 12: Article 643548.

Buschmann, S., Schriefer, J., Bölke, N., Herklotz, V., Neinhuis, C., Olbricht, K., Ritz, C.M. (2021). Origin, structure and genetic diversity of synanthropic populations of Fragaria moschata in Germany. Flora 275: 151762.


Khurelpurev, O., Ritz, C.M., Oyunbileg, M., Lang, B., Ahlborn, J., Oyuntsetseg, B., Römermann, C., Wesche, K. (2020) Climate and land use affect genetic structure of Stipa glareosa P. A. Smirn. in Mongolia. Flora 266: 151572.

Buschmann, S., Olbricht, K., Ritz, C.M. (2020) Fragaria moschata – Geschlechterverhältnisse in natürlichen und synanthropen Populationen. Kochia 13: 23-36.

Lunerová, J, Herklotz, V., Laudien, M., Vozárová, R., Groth, M., Kovařík, A., Ritz, C.M. (2020) Asymmetrical canina meiosis is accompanied by the expansion of a pericentromeric satellite in non-recombining univalent chromosomes in the genus Rosa. Annals of Botany 125 (7): 1025-1038.

Ritz, C.M., Reise, H., Buschmann, S., Ritz, M.S. (2019) Senckenberg Nature Scouts – eine Nachwuchsforschergruppe des Naturkundemuseums Görlitz. In: Heranbildung von Artenkennern – Erfahrungen von drei Generationen. Sächsische Landesstiftung Natur und Umwelt.

Dressler, S., Ritz, C.M., Wesche, K. (2019). Vom Kräuterbuch zum Informationsknoten – die heimische Flora in Forschung und Anwendung. In: Mosbrugger, V. [Hrsg.]: Senckenberg 2018: 30-33. Senckenberg Gesellschaft für Naturforschung, Frankfurt am Main

Loots, S., Nybom, H., Schwager, M., Sehic, J., Ritz, C.M. (2019) Genetic variation among and within Lithops species in Namibia. Plant Systematics and Evolution. 305(10): 385-399.
Franke, R. Gebauer, P., Ritz, C.M., Wesche, K. (2019) Zum 70. Geburtstag von Dr. Friedrich Wilhelm Sander. Berichte der Naturforschenden Gesellschaft der Oberlausitz 27: 225-226.
Loots, S., Ritz, C.M., Schwager, M., Sehic, J., Herklotz, V., Garkava-Gustavsson, L. (2019) Distribution, habitat profile and genetic variability of Namibian succulent Lithops ruschiorum, Bothalia 49 (1), a2408.

Choi, H.-J., Sh, B., Nyam-Osor, B., Ritz, C.M., Chung, G.Y., Jo, H.J., Kim, j.Y., Wesche, K., Khurelbaatar, K., Batlai, O., Shiga, T. (2019) Contribution to the knowledge on the flora of Numrug Strictly Protected Area and some parts of East Mongolia. Journal of Asia-Pacific Biodiversity. 12: 284-301

Ritz, C.M. (2018) Polyploidy and hybridization in the genus Rosa L. (Rosaceae). Habilitation Thesis. TU Dresden, School of Science.
Müller, F., Ritz, C.M., Welk, E., Wesche K. (2018) Kommentare und Ergänzungen zur Neubearbeitung der 22. Auflage der Rothmaler Exkursionsflora von Deutschland Grundband 2019: Eine Vorbemerkung. Schlechtendalia 34:45.

Dressler, S., Ritz, C.M., Wesenberg, J., Wesche, K. (2018) Pflanzen digital – das virtuelle Herbarium Senckenbergianum wächst. Natur Forschung Museum 148 (4-6): 87-89.
Seifert, B., Schultz, R. Ritz, M.S, Ritz C.M. (2018) Cryptic species of the Myrmica tibetana complex(Hymenoptera: Formicidae) revealed by multi-source integrative taxonomy. Myrmecological News:27: 93-110.

Herklotz, V., Kovařík, A.; Lunerová, J. Lippitsch, S., Groth, M., Ritz, C.M. (2018) The fate of ribosomal RNA genes in spontaneous polyploid dogrose hybrids (Rosa L. sect. Caninae (DC.) Ser.) exhibiting non-symmetrical meiosis. Plant Journal 91 (1): 77-90.


Ritz, C.M. (2017) Rosa L. in: Schmidt, P.A. & Schulz, B. (eds.) Fitschen Gehölzflora. 13th ed. Quelle & Meyer, Wiebelsheim

Wesche, K., Beck, A. Ritz, C.M. (2017) Riesengebirge: Mitteleuropas nördlichster Hochgebirgskamm. Tuexenia Beiheft Nr. 10: 95-112.

Ritz, C. M., Wünsche, A. E. (2017) Basaltkuppen in der östlichen Oberlausitz. Tuexenia Beiheft Nr. 10: 49-66.

Herklotz, V., Mieder, N. Ritz, C. M. (2017) Cytological, genetic and morphological variation in mixed stands of dogroses (Rosa sect. Caninae, Rosaceae) in Germany with a focus on the hybridogenic R. micrantha. Bot. J. Linn. Soc. 184: 254-271.
Dressler, S., Gregor, T., Hellwig, F.H., Korsch, H., Wesche, K., Wesenberg, J. Ritz, C.M. (2017) Comprehensive  and reliable: a new online portal of critical plant taxa in Germany. Pl. Syst. Evol. 303(8):1109-1113.
Lesemann, S. S., Bölke, N., Tejeda-Fernandez, C. E., Gerischer, U., Buschmann, S., Herklotz, V., Neinhuis, C., Ritz, C. M., Olbricht, K. (2017) Fruit diversity in a natural European habitat of Fragaria moschata Weston. Acta Hort. 1156 ISHS: 215-222.
Jäger, E. J., Müller, F., Ritz, C.M., Welk, E., Wesche, K. (2017) Rothmaler Exkursionsflora von Deutschland. Gefäßpflanzen:Atlasband. 13th ed. Springer Spektrum, Heidelberg.
Herklotz, V., Ritz, C. M. (2017) Multiple and asymmetric origin of polyploid dogrose hybrids (Rosa L. sect. Caninae (DC.) Ser.) involving unreduced gametes. Ann. Bot. 120(2):209-220.

Müller, F., Ritz, C.M., Welk, E., Wesche, K. (2016). Rothmaler Exkursionsflora von Deutschland. Kritischer Ergänzungsband. 11th ed. Springer Spektrum, Heidelberg.
Wesche, K., Otte, V., Boyle, H., Damm, U., Gebauer, P., Ritz, C.M., Wesenberg, J. (2016). Die botanisch-mykologischen Sammlungen in Görlitz – zentrale Anlaufstellen für die haupt-und ehrenamtliche Pflanzen- und Pilzkunde in der Oberslausitz. Ber. Naturf. Ges. Oberlausitz 24: 37-50.
Ritz, C. M., Fickenscher, K., Föller, J., Herrmann, K., Mecklenburg, R. Wahl, R. (2016) Molecular phylogenetic relationships, a new classification and a morphological identification key of the Andean genus Aylostera Speg. (Cactaceae, Trichocereeae). Pl. Syst. Evol. 302: 763-780.
Reichel, K., Richter, F., Eichel, L., Kącki, Z., Wesche, K., Welk, E., Neinhuis, C., Ritz, C.M. (2016) Genetic diversity in the locally declining Laserpitium prutenicum L. and the more common Selinum carvifolia (L.) L. – a “silent goodbye”? Conserv. Genet. 17 (4):847-860.
Kadereit, J. W., Albach, D. C., Ehrendorfer, F., Galbany-Casals, M., Garcia-Jacas, N., Gehrke, B., Kadereit, G., Kilian, N., Klein, J. T., Koch, M. A., Kropf, M., Oberprieler, C., Pirie, M. D., Ritz, C. M., Röder, M., Spalik, K., Susanna, A., Weigend, M., Welk, E., Wesche, K., Zhang, L.-B., Dillenberger, M. S. (2016) Generic circumscriptions in the German flora. Willdenowia 46 (1): 39-91.


Vogt, J. C., Herklotz, V. Ritz, C. M. (2015). Epigenetic patterns in genetically imbalanced polyploid dogrose hybrids (Rosa L. sect. Caninae (DC.) Ser.) revealed by cDNA-AFLPs and MSAPs. Int. J. Pl. Sci. 176:433-445.

Dressler, S., Gregor, T., Korsch, H., Wesche, K., Wesenberg, J. & Ritz, C. M. (2015 ff.) Bestimmungskritische Taxa der deutschen Flora. Herbarium Senckenbergianum Frankfurt/Main, Görlitz & Herbarium Haussknecht Jena. [online]


Herklotz, V., Ritz, C. M. (2014) Spontane Hybridisierung von Hundsrosen (Rosa L. sect. Caninae (DC). Ser.) an einem natürlichen Vorkommen in der Oberlausitz (Sachsen, Deutschland). Peckiana 9: 119-131.

Ritz, C.M., Hunt, D. 2014 Further observations on the Andean Opuntioideae. Succ. Plant Res. 8: 119-138

Kellner, A., Ritz, C. M., Wissemann, V. (2014) Low genetic and morphological differentiation in the European species complex of Rosa sherardii, R. mollis and R. villosa (Rosa, sect. Caninae, subsect. Vestitae). Bot J. Linn. Soc. 174: 240-256.


Dressler, S., Gregor, T., Otte, V., Paule, J., Ritz, C. M., Wesche, K., Wesenberg, J. (2013) Forschungen zur heimischen Flora. Senckenberg – Natur, Forschung, Museum 143 (7/8): 254-255.
Jäger, E.J., Müller, F., Ritz, C. M., Welk, E. & Wesche, K. (2013) Rothmaler – Exkursionsflora von Deutschland. Gefäßpflanzen: Atlasband, 12 edn. Spektrum Akademischer Verlag, Heidelberg.


Kellner, A., Ritz, C. M., Wissemann, V. (2012) Hybridisation by invasive Rosa rugosa Thunb. threatens the genetic integrity of native R. mollis Sm. Bot. J. Linn. Soc. 170: 472-484.

Ritz, C. M., Reiker, J., Charles, G., Hoxey, P., Hunt, D. R., Lowry, M., Stuppy, W., Taylor, N. (2012) Molecular phylogeny and character evolution in terete-stemmed Andean opuntias (Cactaceae − Opuntioideae). Mol. Phylogenet. Evol. 65: 668-681.

Kellner, A., Benner, M., Walther, H., Kunzmann, L., Wissemann, V., Ritz, C. M. (2012) Leaf architecture of extant species of Rosa L. and the Paleogene species Rosa lignitum Heer (Rosaceae). Int. J. Plant. Sci. 173 (3) 239-250.
Hirsch, H., Zimmermann, H., Renison, D., Ritz, C. M., Wissemann, V., Wesche, K., Welk, E. & Hensen, I. (2011) Tracking the European origin of the Rosa rubiginosa L. (Rosaceae) invasion in Argentina. Int. J. Plant Sci. 172 (4): 530-540.
Ritz, C. M., Köhnen, I., Groth, M., Theißen. G, Wissemann, V. (2011) To be or not to be the odd one out – Allele-specific transcription in pentaploid dogroses (Rosa L. sect. Caninae (DC.) Ser). BMC Plant Biol. 11: 37.

Ritz, C. M., Wissemann, V. (2011) Microsatellite analyses of artificial and spontaneous dogrose hybrids reveal the hybridogenic origin of Rosa micrantha by the contribution of unreduced gametes. J. Hered. 102 (2): 217-227.
Kellner, A. Ritz, C. M., Schlittenhardt, P. and Hellwig, F. H. (2011) Genetic differentiation in the genus Lithops L. (Ruschioideae, Aizoaceae) reveals a high level of convergent evolution and reflects geographic distribution. Plant Biol. 13 (2): 368-380.
Kohnen, A., Brandl R., Fricke, R., Gallenmüller, F., Klinge, K., Köhnen, I., Maier, W., Oberwinkler, F., Ritz, C. M., Speck, T., Theissen, G., Tscharntke, T., Vaupel, A. & Wissemann, V. (2010) Radiation, biological diversity and host-parasite interactions in wildroses, rust fungi and insects. In Glaubrecht, M. (ed.) Evolution in action. Springer, Berlin, Heidelberg.

Zimmermann, H., Ritz, C. M., Hirsch, H., Renison, D., Wesche, K., Hensen, I. (2010) Highly reduced genetic diversity of Rosa rubiginosa L. populations in the invasive range. Int. J. Plant Sci. 171 (4): 435-446.

Zimmermann, N. F. A., Ritz, C. M. & Hellwig, F. H. (2010) Further support for the phylogenetic relationships within Euphorbia L. (Euphorbiaceae) from nrITS and trnL-trnF IGS sequence data. Plant Syst. Evol. 286: 39-58.
Uhlemann, I., Ritz, C. M., Peňailillo, P. (2009) Relationships in Taraxacum section Artica s.l. (Asteraceae, Chichorieae) and allies based on nrITS. Feddes Repertorium 120 (1-2): 35-47.
Koopman, W. J. M., Wissemann, V., Cock, de K., Van Huylenbroeck, van, J. Riek, de J., Sabatino, G. J. H.,Visser, D.,Vosman, B., Ritz, C. M., Maes, B., Werlemark, G., Nybom, H., Debener, T., Linde, M., Smulders M. J. M. (2008) AFLP markers as a tool to reconstruct complex relationships: A case study in Rosa (Rosaceae) Am. J. Bot. 95: 353-366.
Ritz, C. M., Martins, L. Mecklenburg, R., Goremykin, V., Hellwig, F. H. (2007) The molecular phylogeny of Rebutia (Cactaceae) and its allies demonstrates the influence of paleogeography on the evolution of South American mountain cacti. Am. J. Bot. 94 (8):1321-1332.

Wissemann, V. & Ritz, C. M. (2007) Patterns and processes in the genus Rosa (Rosaceae) and their implications for host-parasite co-evolution. Plant Syst. Evol. 266 (1-2) 79-89.
Wissemann, V., Gallenmueller, F., Ritz, C. M., Steinbrecher, T. & Speck, T. (2006) Inheritance of growth form and mechanical characters in reciprocal polyploid hybrids of Rosa section Caninae– implications for the ecological niche differentiation and radiation process of hybrid offspring. Trees –Structure and Function 20 (3): 340-347.

Ritz, C. M., Maier, W. F. A., Oberwinkler, F. & Wissemann, V. (2005) Different evolutionary histories of two Phragmidium species infecting the same dogrose hosts. Mycol. Res. 109 (5) 603-609.

Ritz, C. M., Schmuths H. & Wissemann, V. (2005) Evolution by reticulation: European dogroses originated by multiple hybridization across the genus Rosa J. Hered. 96 (1): 4-14.

Wissemann, V. & Ritz, C. M. (2005) The genus Rosa (Rosoideae, Rosaceae) revisited: molecular analysis of nrITS-1 and atpB-rbcL intergenic spacer (IGS) versus conventional taxonomy. Bot. J. Linn. Soc. 147: 275-290.
Ritz, C. M. & Wissemann, V. (2003) Male correlated non-matroclinal character inheritance in reciprocal hybrids of Rosa section Caninae (DC) Ser. (Rosaceae). Plant Syst. Evol. 241 (3-4): 213-221.
Ritz, C. M., Zimmermann, N. F. A. & Hellwig, F. H. (2003) Phylogeny of subsect. Meleuphorbia (A.Berger) Pax & Hoffm. (Euphorbia L.) reflects the climatic regime in South Africa. Plant Syst. Evol. 241 (3-4): 245-259

Ritz, C. M. & Wissemann, V. (2003) The evolution of diversity in Rosa L., section Caninae (DC) Ser. Rosaceae. In: 16. Symposium Biodiversität und Evolutionsbiologie. 17. Senckenbergkolloquium, Frankfurt. (Abstract)

Ritz, C. M., Köhnen, I., Groth, M., Theißen. G, Wissemann, V. (2011) Allele-specific transcription in pentaploid dogroses. In: Biosytematics 2011, Berlin, Germany (Abstract)

Jäger, E., Müller, F., Welk, E., Wesche, K., Ritz, C. M. (2010) Neuigkeiten zur Rothmaler Exkursionsflora von Deutschland. Jahrestagung der Gesellschaft zur Erforschung der Flora von Deutschland e. V., Hannover.

Ritz, C. M. (2009) Die hybridogene Entstehung von Rosa micrantha. Jahrestagung der Gesellschaft zur Erforschung der Flora von Deutschland e. V., Jena

Ritz, C. M. (2009) CintiaSulcorebutiaWeingartia: Spiny morphology and thorny genetics. In: 8th IOS Congress, Bonn (Abstract)

Ritz, C. M., Köhnen I., Theißen, G. & Wissemann, V. (2007) Allelic differentiation of two single copy genes in pentaploid roses. In: Botanikertagung der Deutschen Botanischen Gesellschaft. Hamburg, (Abstract)

Wissemann, V. & Ritz, C. M. (2005) Hybridization as an evolutionary factor in Rosoideae with a focus on Rosa. In: XVII. International Botanical Congress. Vienna, Austria. (Abstract)

Ritz, C. M. & Wissemann, V. (2003) The evolution of diversity in Rosa L., section Caninae (DC) Ser. Rosaceae. In: 16. Symposium Biodiversität und Evolutionsbiologie. 17. Senckenbergkolloquium, Frankfurt. (Abstract)
Deutschsprachige Publikationen

Ritz, C. M., Mecklenburg, R. (2008) Die Phylogenie von Rebutia und ihren Verwandten spiegelt die geologische Geschichte Südamerikas wider. Kakteen und andere Sukkulenten 6: 157-170.

Ritz, C. M. & Zimmermann, N. (2004) Die Phylogenie der Subsektion Meleuphorbia (A. Berger) Pax & Hofmann (Euphorbia Linné). Kakteen und andere Sukkulenten 12 (55): 350-358.

Scholz, C. & Uhlemann, I. (2001) Leucanthemum ircutianum DC. und Leucanthemum vulgare Lam. in Sachsen Anhalt. Mitt. Flor. Kart. Sachsen-Anhalt 6: 43-48

Scholz, C. & Uhlemann, I. (2001) Leucanthemum ircutianum DC. in Brandenburg und Sachsen. Ber. Arbeitsgem. sächs. Bot., Neue Folge. 18: 79-84

Drechsler, N., Scholz, C. & Uhlemann, I. (2000) Vergleichende Untersuchungen mikromorphologischer Blattmerkmale bei Eragrostis albensis und E. pilosa (Poaceae). Verh. Bot. Ver. Berlin Brandenburg. 133: 307-312