The species-rich and widespread genus Taraxacum F. H. Wiggers, 1780 (Asteraceae subfamily Cichorioideae) is one of the most taxonomically complex plant genera in the world, mainly due to its combination of different sexual and asexual reproduction strategies. Polyploidy is usually confined to apomictic microspecies, varying from 3x to 6x (rarely 10x). In this study, we focused on Taraxacum sect. Taraxacum (= T.sect.Ruderalia; T.officinale group), i.e., the largest group within the genus. We counted chromosome numbers and measured the DNA content for species sampled in Central Europe, mainly in Czechia. The chromosome number of the 28 species (T.aberrans Hagendijk, Soest & Zevenbergen, 1974, T.atroviride Štěpánek & Trávníček, 2008, T.atrox Kirschner & Štěpánek, 1997, T.baeckiiforme Sahlin, 1971, T.chrysophaenum Railonsala, 1957, T.coartatum G.E. Haglund, 1942, T.corynodes G.E. Haglund, 1943, T.crassum H. Øllgaard & Trávníček, 2003, T.deltoidifrons H. Øllgaard, 2003, T.diastematicum Marklund, 1940, T.gesticulans H. Øllgaard, 1978, T.glossodon Sonck & H. Øllgaard, 1999, T.guttigestans H. Øllgaard in Kirschner & Štěpánek, 1992, T.huelphersianum G.E. Haglund, 1935, T.ingens Palmgren, 1910, T.jugiferum H. Øllgaard, 2003, T.laticordatum Marklund, 1938, T.lojoense H. Lindberg, 1944 (= T.debrayi Hagendijk, Soest & Zevenbergen, 1972, T.lippertianum Sahlin, 1979), T.lucidifrons Trávníček, ineditus, T.obtusifrons Marklund, 1938, T.ochrochlorum G.E. Haglund, 1942, T.ohlsenii G.E. Haglund, 1936, T.perdubium Trávníček, ineditus, T.praestabile Railonsala, 1962, T.sepulcrilobum Trávníček, ineditus, T.sertatum Kirschner, H. Øllgaard & Štěpánek, 1997, T.subhuelphersianum M.P. Christiansen, 1971, T.valens Marklund, 1938) is 2n = 3x = 24. The DNA content ranged from 2C = 2.60 pg (T.atrox) to 2C = 2.86 pg (T.perdubium), with an average value of 2C = 2.72 pg. Chromosome numbers are reported for the first time for 26 species (all but T.diastematicum and T.obtusifrons), and genome size estimates for 26 species are now published for the first time.

中文翻译：

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蒲公英属 28 个物种的新染色体计数和基因组大小估计。蒲公英。

物种丰富且分布广泛的蒲公英属（Taraxacum FH Wiggers, 1780）（菊科菊科菊亚科）是世界上分类学最复杂的植物属之一，这主要是由于其结合了不同的有性和无性繁殖策略。多倍体通常仅限于无融合生殖的微小物种，范围从 3 倍到 6 倍（很少为 10 倍）。在这项研究中，我们重点关注蒲公英科。蒲公英（= T.sect.Ruderalia；T.officinale 组），即该属内最大的组。我们计算了中欧（主要是捷克）采样物种的染色体数量并测量了 DNA 含量。28个物种的染色体数目（T.aberrans Hagendijk, Soest & Zevenbergen, 1974, T.atroviride Štěpánek & Trávníček, 2008, T.atrox Kirschner & Štěpánek, 1997, T.baeckiiforme Sahlin, 1971, T.chrysophaenum Railonsala, 1957 , T.coartatum GE Haglund, 1942, T.corynodes GE Haglund, 1943, T.crassum H. Øllgaard & Trávníček, 2003, T.deltoidifrons H. Øllgaard, 2003, T.diastematicum Marklund, 1940, T.gesticulans H. Øllgaard ，1978，T.glossodon Sonck & H. Øllgaard，1999，T.guttigestans H. Øllgaard in Kirschner & Štěpánek，1992，T.huelphersianum GE Haglund，1935，T.ingens Palmgren，1910，T.jugiferum H. Øllgaard，2003 , T.laticordatum Marklund, 1938, T.lojoense H. Lindberg, 1944 (= T.debrayi Hagendijk, Soest & Zevenbergen, 1972, T.lippertianum Sahlin, 1979), T.lucidifrons Trávníček, ineditus, T.obtusifrons Marklund, 1938 , T.ochrochromum GE Haglund, 1942, T.ohlsenii GE Haglund, 1936, T.perdubium Trávníček, ineditus, T.praestabile Railonsala, 1962, T.sepulcrilobum Trávníček, ineditus, T.sertatum Kirschner, H. Øllgaard & Štěpánek, 199 7 ，T.subhuelphersianum MP Christiansen, 1971, T.valens Marklund, 1938) 为 2n = 3x = 24。DNA 含量范围为 2C = 2.60 pg (T.atrox) 至 2C = 2.86 pg (T.perdubium)，其中2C 平均值 = 2.72 pg。首次报告了 26 个物种（除 T.diastematicum 和 T.obtusifrons 之外的所有物种）的染色体数量，并且首次公布了 26 个物种的基因组大小估计值。