New Literature

Literature Archive: 2016 | 2017 | 2018 | 2019 | 2020

Not all members of the International Cichorieae Network do have access to botanical libraries. As a service we would like to point to recent publications regarding Cichorieae. However, some articles will escape our attention. Therefore, your hints to recent publications are always welcome. 

----------------------------------------------------------------------------------------------------------------------------

12 March 2020

Wang Z.-H., Kilian N., Chen Y.-P. & Peng H. 2020: Sinoseris (Crepidinae, Cichorieae, Asteraceae), a new genus of three species endemic to China, one of them new to science. – Willdenowia 50: 91–110.

Abstract
“Studies to elucidate the systematic position of two Chinese species described originally as Lactuca hirsuta and L. scandens, of which only historical specimens from the late 19th and early 20th centuries were known, revealed the occurrence of three different species. Molecular phylogenetic analysis of these species based on sequences of the nuclear ribosomal internal transcribed spacer (nrITS) region and three plastid DNA markers (trnL-F, psbA-trnH, matK) uncovered a hitherto unknown lineage in a first comprehensive phylogenetic backbone of the subtribe Crepidinae (Asteraceae, tribe Cichorieae). Substantiated by comparative morphological studies, this lineage is described as a new genus, named Sinoseris, endemic to the Chinese provinces Sichuan and Yunnan. One of its three species is new to science, while another is conspecific with both L. hirsuta and L. scandens. The third was meanwhile described by other authors as Nabalus muliensis and is now transferred to Sinoseris.”

----------------------------------------------------------------------------------------------------------------------------

12 March 2020

Hatami E., Mirtadzadini M., Bordbar F. & Jones K. E. 2020: Delimitation of Iranian species of Scorzonera subg. Podospermum and S. subg. Pseudopodospermum (Asteraceae, Cichorieae) based on morphological and molecular data. – Willdenowia 50: 39–63.

Abstract
Scorzonera L. is represented by 57 species in Iran including three subgenera: S. subg. Scorzonera, S. subg. Podospermum and S. subg. Pseudopodospermum. Species of S. subg. Podospermum and S. subg. Pseudopodospermum in Iran are morphologically similar, which limits species delimitation. In order to clarify intersubgeneric and interspecific delimitation in Iran, we carried out extensive sampling of the two subgenera in Iran. We conducted phylogenetic analyses based on the nuclear Internal Transcribed Spacer (nrITS), detailed morphological studies, and we evaluated the systematic value of achene features. Our results showed that Scorzonera s.l. is polyphyletic, and both S. subg. Podospermum and S. subg. Pseudopodospermum are monophyletic. The monophyly of S. subg. Podospermum morphologically corresponds to a combination of characters containing pinnatifid leaves, phyllaries with black corniculate projections, and the presence of a swollen carpopodium on the achenes. A comparison of the topology observed in the nrITS phylogeny with achene features indicates that a sculptured achene wall surface in members of S. subg. Pseudopodospermum provides a synapomorphy for this lineage. This study supports a broader circumscription of S. subg. Pseudopodospermum with the addition of S. calyculata (S. sect. Incisae), S. ovata, S. papposa and S. paradoxa (S. sect. Papposae). Finally, we provide a taxonomic treatment, including an identification key and species diagnoses and distributions, with nomenclature of Iranian species.”

----------------------------------------------------------------------------------------------------------------------------

12 March 2020

Brandstätter G. 2019: Hieracium rotundatum Kit. ex Schult. neu für die Flora Deutschlands und Tschechiens. – Stapfia 111: 92-96.

Abstract
“Presentation and discussion of the first records of Hieracium rotundatum for the flora of Germany and the Czech Republic.”

----------------------------------------------------------------------------------------------------------------------------

12 March 2020

Szeląg Z. & Vladimirov V. 2020: Pilosella bulgarica (Asteraceae) a new hybridogenous species from Bulgaria. – Phytotaxa 428: 290–294.

Abstract
“The newly described Pilosella bulgarica combines the morphological features of P. pavichii and P. rhodopea, and grows in the subalpine habitats in the Kurudere gorge in the Triglav massif, Central Stara Planina Mountains, Bulgaria. It is illustrated with photos of the holotype (kept at SOM) and living plants in the locus classicus.”

----------------------------------------------------------------------------------------------------------------------------

15 January 2020

Gottschlich G. 2020: Synopse der für Deutschland nachgewiesenen Arten und Unterarten der Gattung Hieracium s.l. (Hieracium s. str. und Pilosella), aufgeschlüsselt nach Vorkommen in den einzelnen Bundesländern / Synopsis of all species and subspecies of the genus Hieracium s. l. (Hieracium s. str. and Pilosella) in Germany according to the records cited in literature for the German federal states. – Forum Geobot. 9: 1–59.

Abstract
“A list of 205 collective species and 1563 subspecies of the genus Hieracium s. l. detected for Germany and its federal states, is provided. As the most infraspecific taxa were described under Hieracium s.l. and to avoid too much invalid names under Pilosella in the list, a separation of Hieracium and Pilosella is remained undone. By coloured marking additional informations are given whether a subspecies is originally described from a German federal state or its name has a syntype from Germany.”

----------------------------------------------------------------------------------------------------------------------------

15 January 2020

Van Es J & Tison J.-M. 2018: Notices descriptives de Hieracium des Alpes françaises. – Conservatoire Botanique National Alpin, 255 p. http://www.cbn-alpin-biblio.fr/GED_CBNA/113330293151/BB_33694.pdf

----------------------------------------------------------------------------------------------------------------------------

9 January 2020

Zaika M. A., Kilian N., Jones K., Krinitsina A. A., Nilova M. V., Speranskaya A. S. & Sukhorukov A. P. 2020: Scorzonera sensu lato (Asteraceae, Cichorieae) – taxonomic reassessment in the light of new molecular phylogenetic and carpological analyses. – PhytoKeys 137: 1-85.

Abstract
Scorzonera comprises 180–190 species and belongs to the subtribe Scorzonerinae. Its circumscription has long been the subject of debate and available molecular phylogenetic analyses affirmed the polyphyly of Scorzonera in its wide sense. We provide a re-evaluation of Scorzonera and other related genera, based on carpological (including anatomical) and extended molecular phylogenetic analyses. We present, for the first time, a comprehensive sampling, including Scorzonera in its widest sense and all other genera recognised in the Scorzonerinae. We conducted phylogenetic analyses using Maximum Parsimony, Maximum Likelihood and Bayesian analyses, based on sequences of the nuclear ribosomal ITS and of two plastid markers (partial rbcL and matK) and Maximum Parsimony for reconstructing the carpological character states at ancestral nodes. Achene characters, especially related to pericarp anatomy, such as general topography of the tissue types, disposition of the mechanical tissue and direction of its fibres, presence or absence of air cavities, provide, in certain cases, support for the phylogenetic lineages revealed. Confirming the polyphyly of Scorzonera, we propose a revised classification of the subtribe, accepting the genera Scorzonera (including four major clades: Scorzonera s. str., S. purpurea, S. albicaulis and Podospermum), Gelasia, Lipschitzia gen. nov. (for the Scorzonera divaricata clade), Pseudopodospermum, Pterachaenia (also including Scorzonera codringtonii), Ramaliella gen. nov. (for the S. polyclada clade) and Takhtajaniantha. A key to the revised genera and a characterisation of the genera and major clades are provided.”

----------------------------------------------------------------------------------------------------------------------------

7 January 2020

Mráz P., Filipaş L., Bărbos M. I., Kadlecová J., Paštová L., Belyayev A. & Fehrer J. 2019: An unexpected new diploid Hieracium from Europe: Integrative taxonomic approach with a phylogeny of diploid Hieracium taxa. – Taxon 68: https://doi.org/10.1002/tax.12149

Abstract
Hieracium s.str. (Asteraceae) is one of the largest angiosperm genera notorious for its taxonomic complexity caused by widespread interspecific hybridization. This process is tightly coupled with polyploidization and apomixis – asexual reproduction by seeds, which has ensured the persistence of otherwise sterile interspecific hybrids. As a result, apomictic polyploid taxa dominate the taxonomic diversity of the genus whilst sexual diploid species are extremely rare and mostly confined to southern Europe. As diploid taxa are assumed to be the parents of apomictic lineages, the discovery of any new diploid species is important for understanding evolutionary processes and diversity patterns in the genus. Here, we describe a new diploid species, Hieracium vranceae, a narrow endemic to the Munţii Vrancei (Vrancea Mountains, Eastern Carpathians, Romania). This taxon with a distinctive morphology and a strong affinity to relic rocky habitats was first collected in 2013. This means that, even in Europe, some regions, like the Eastern Carpathians, are botanically underexplored and might still preserve an undiscovered diversity of plants. Phylogenetic analyses with multiple molecular markers (low‐copy nuclear genes gsh1 and sqs, nuclear ribosomal ETS, four cpDNA loci) applied to all diploid Hieracium species support specific rank for H. vranceae. In contrast, molecular data suggest conspecifity of two pairs of species, H. lucidum/H. cophanense from Sicily and H. naegelianum/H. renatae from the Balkans, which are moreover only weakly differentiated morphologically. Molecular (cpDNA) and cytogenetic (GISH, FISH) analyses furthermore revealed that H. vranceae has been involved as a maternal parent in the origin of an allotriploid apomictic species, H. telekianum, to which H. vranceae contributed one haplome. The other putative parents of H. telekianum are the diploid narrow endemic H. pojoritense and probably H. sparsum s.l. Our data thus stress the importance of interspecific hybridization for an evolutionary shift from sexuality to apomixis in Hieracium. Our findings furthermore highlight the significance of that part of the Carpathians as one of the most important evolutionary/refugial centres of Hieracium and suggest dynamic species ranges at a regional scale allowing physical contact of taxa whose distributional ranges are nowadays completely allopatric.”

----------------------------------------------------------------------------------------------------------------------------

7 January 2020

Mráz P. & Zdvořák P. 2019: Reproductive pathways in Hieracium s.s. (Asteraceae): strict sexuality in diploids and apomixis in polyploids. – Ann. Bot. 123: 391–403.

Abstract
“Background and Aims: Apomixis or asexual seed reproduction is a key evolutionary mechanism in certain angiosperms providing them with reproductive assurance and isolation. Nevertheless, the frequency of apomixis is largely unknown, especially in groups with autonomous apomixis such as the diploid–polyploid genus Hieracium.
Methods:Using flow cytometric analyses, we determined the ploidy level and reproductive pathways (sexual vs. apomictic) for 7616 seeds originating from 946 plants belonging to >50 taxa sampled at 130 sites across Europe.
Key Results: Diploid seeds produced by diploids were formed exclusively by the sexual pathway after double fertilization of reduced embryo sacs. An absolute majority of tri- and tetraploid seeds (99.6 %) produced by tri- and tetrapolyploid taxa were formed by autonomous apomixis. Only 20 polyploid seeds (0.4 %) were formed sexually. These seeds, which originated on seven polyploid accessions of four taxa, were formed after fertilization of either unreduced embryo sacs through a so-called triploid bridge or reduced embryo sacs, and frequently resulted in progeny with an increased ploidy. In addition, the formation of seedlings with increased ploidy (4x and 6x) was found in two triploid plants. This is the first firm evidence on functional facultative apomixis in polyploid members of Hieracium sensu stricto (s.s.).
Conclusions: The mode of reproduction in Hieracium s.s. is tightly associated with ploidy. While diploids produce seeds exclusively sexually, polyploids produce seeds by obligate or almost obligate apomixis. Strict apomixis can increase the reproductive assurance and this in turn can increase the colonization ability of apomicts. Nevertheless, our data clearly show that certain polyploid plants are still able to reproduce sexually and contribute to the formation of new cytotypes and genotypes. The finding of functional facultative apomicts is essential for future studies focused on evolution, inheritance and ecological significance of apomixis in this genus.”