Folia Geobotanica

, Volume 33, Issue 4, pp 391–414 | Cite as

A revision ofTaraxacum sect.Piesis (Compositae)



On the basis of allozyme and cultivation data, and of additional herbarium material, a taxonomic and nomenclatural revision ofTaraxacum sect.Piesis A.J. Richards exKirschner etŠtěpánek is provided. The section is made up of halophilous, sexually reproducing taxa. InT. stenocephalum Boiss. etKotschy,T. pindicum Kirschner etŠtěpánek, sp. nov., andT. perenne Kirschner etŠtěpánek, sp. nov., a tetraploid chromosome number has been recorded, representing the only known case of sexuality at the tetraploid level in the genus. The complex ofT. stenocephalum, includes some geographically and morphologically extreme populations treated as subspecies: subsp.gumusanicum (Soest)Kirschner etŠtěpánek, comb. nov., subsp.magnum Kirschner etŠtěpánek, subsp. nov., and subsp.daralagesicum (Schischk.)Kirschner etŠtěpánek, comb. nov. In addition toT. bessarabicum (Hornem.)Hand.-Mazz., a widely distributed Eurasian species,T. stenocephalum, a complex centred in Transcaucasia and Anatolia, andT. pachypodum H. Lindb., a North African endemic, four new species are described:T. salsum Kirschner etŠtěpánek, sp. nov., a diploid endemic confined to E Crimea,T. perenne Kirschner etŠtěpánek, sp. nov., a tetraploid sexual species known only from SW Crimea,T. pindicum Kirschner etŠtěpánek, sp. nov., a remarkable tetraploid endemic to the Pindos Mts., Greece, andT. salsitatis Kirschner, Štěpänek etYirdirimli, sp. nov., an Anatolian diploid species. Furthermore, a hybrid betweenT. salsum andT. bessarabicum from Crimea (documented on the basis of allozyme data elsewhere) is given a binomial,T. xmesohalobium Kirschner etŠtěpánek, nothosp. nov.


Asteraceae Lactuceae Taraxacum Taxonomy 


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© Institute of Botany 1998

Authors and Affiliations

  1. 1.Department of Taxonomy, Institute of BotanyAcademy of Sciences of the Czech RepublicPrůhonice 1Czech Republic

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