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Folia Geobotanica

, Volume 43, Issue 1, pp 69–82 | Cite as

Hypericum dubium Leers—New Data on Taxonomy and Biology

  • Pavol MártonfiEmail author
Article

Abstract

New data on the taxonomy, karyology, reproductive biology and secondary metabolites of Hypericum dubium Leers (=H. maculatum subsp. obtusiusculum (Tourlet) Hayek) are given. The neotypification of the name H. dubium by plants from the locus classicus near the town of Herborn in Germany is presented. Hypericum dubium is characterized by stems with slightly conspicuous subsidiary lines, sepals with a finely denticulate or rarely entire apex, petals with pale and black, linear to striiform laminar glands. Karyological data confirm that the taxon is tetraploid (2n = 32). Reproduction by facultative apomixis was discovered using a flow cytometric seed screen. In the spectrum of secondary metabolites, flavonoids, naphtodianthrones and phloroglucinol derivatives were found. The previously described taxon H. carpaticum Mártonfi is reclassified here to the level of nothospecies as H. dubium × H. maculatum. For the epitheton balcanicum a new combination Hypericum ×carinthiacum nothosubsp. balcanicum (N. Robson) Mártonfi is proposed. Finally, this paper provides a revised scheme of relationships among taxa of the H. maculatum group.

Keywords

Distribution Flow cytometry Karyology Morphology Neotypification Secondary metabolites 

Notes

Acknowledgements

I am very much obliged to the following persons for their help, cooperation and advice: F. Graffmann (Herborn), N. K. B. Robson (London), S. Balandin (Moscow), L. Mártonfiová, M. Repčák (Košice), J. Štěpánek (Prague) and K. Marhold (Bratislava). My thanks are also due to A. Miller (St. Louis) for the language corrections. Thanks also to A. Michalčová and E. Sasáková for the technical help. The support for this research was provided by the Slovak Research and Development Agency, Bratislava (APVV, no. 51-026404).

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Copyright information

© Institute of Botany, Academy of Sciences of the Czech Republic 2008

Authors and Affiliations

  1. 1.Faculty of Science, Institute of Biology and Ecology, Department of BotanyP. J. Šafárik UniversityKošiceSlovakia

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