Taxonomic revision and conservation status of Centaurea davidovii (sect. Lepteranthus, Asteraceae) (original) (raw)
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New locality of Centaurea pichleri (Asteraceae) in Bulgaria
2018
Centaurea pichleri Boiss. belongs to subgenus Cyanus of Asteraceae and has a very complex taxonomy. It is distributed in Turkey (mainly in Central Anatolia), Greece, Bulgaria and Lebanon. In the Bulgarian flora the species has a conservation value being protected by the national Biodiversity Act and listed in the Red List of vascular plants in Bulgaria. During field investigations in the spring of 2016 a new locality of the species in Toundzha hilly country (SE Bulgaria) was found. The new population of C. pichleri is in a good state and numbers over then 1000 individuals. From the spatial location of individuals it can be assumed that the reproduction of the species in this locality combined vegetative and seed model. In the new locality, no threats to the species' population were registrated.
Reproductive biology of the endangered Bulgarian endemic Centaurea achtarovii (Asteraceae)
Biologia, 2018
Centaurea achtarovii Urum. is a Bulgarian endemic, distributed only in Pirin Mountain. It is protected by the Biodiversity Act and included in the Red Data Book of Bulgaria as Bendangered^. Assessment of size and density was carried out of both known populations of the species, around Orelyak summit and Kazanite locality. It was conducted in 2 sampling plots of 1000 square meters in each population and revealed their good condition. Population of Orelyak was larger and with higher density than that of Kazanite: 75 ha, 0.58 individuals per m 2 (an average of 0.56 rosettes and 0.02 in flowering stage), and 35 ha, 0.23 individuals per m 2 (an average of 0.16 rosettes and 0.07 in flowering stage), respectively. Elucidation of the reproductive biology of C. achtarovii was important in order to find the most appropriate conservation strategy for the species. Flower buds and open flowers in different stages of development were treated by the classical paraffin methods. The structures in male and female generative spheres were stable, the processes leading to formation of embryos and seeds were balanced, and no apomixes was noticed. Pollen viability assessed by acetocarmine test was over 50%, and seed viability estimated by tetrazolium test was 17.5%. In vitro seed germination was poor and culture growth was slow. The low viability of seeds, and the small amount of pollen, although with relatively high fertility, determined a low reproductive capacity of the species. In situ strategies reducing competitive species like Juniperis sibirica were recommended.
The Balkan endemic Colymbada finazzeri (Centaureinae, Asteraceae) in the Bulgarian flora
2006
Colymbada finazzeri is a Balkan endemic, with only one population in Bulgaria in the Zemen Gorge, Kyustendil district (in the floristic region of the Valley of River Strouma, northern part). The species was considered extinct in the course of several decades, until it was found again in 2004. The present article reconfirms the distribution of C. finazzeri in Bulgaria. It also produces data on the taxonomy, morphology, biology of reproduction, and ecology of the species, as well as on the status of its population.
Plant Systematics and Evolution, 2012
In this study, the detailed pollen morphological structures of some endemic Turkish species of Centaurea amaena Boiss., C. antalyense H. Duman & A. Duran, C. aphrodisea Boiss., C. hierapolitana Boiss., C. luschaniana Heimerl, C. lycia Boiss., C. tossiensis Freyn. Et Sint., and C. wagenitzii Hub.-Mor. (Asteraceae, section Phaloletis) were studied under light microscopy (LM) and scanning electron microscopy (SEM) for the first time. LM and SEM investigations showed that the pollen grains of eight taxa are more or less spheroidal-subprolate, the amb triangular and tricolporate. The exine sculpture is tectate, microechinate-scabrate in the pollen of Centaurea taxa. Spinules are less dense in Centaurea amaena, C. antalyense, C. hierapolitana, and C. lycia, but they are more dense in C. aphrodisea, C. luschaniana, C. tossiensis, and C. wagenitzii. Spinule dimensions are different from each other. The exine has one layer of columellae beneath the spines. We determined all taxa that have the Helianthoid type. Exine sctructure and sculpture as well as spine density and dimensions in Asteraceae are the most reliable characteristics for discriminating taxa.
2014
This study was carried out to determine the main distinctive morphological, cytological and palynological features of three closely related Centaurea L. taxa (Asteraceae) growing in Turkey: C. aytugiana Bancheva, Kaya et Binzet, C. stenolepis Kerner and C. salicifolia M. Bieb. ex Willd. The first species, recently described from Karabuk province, Turkey (Bancheva et al. 2014), is an endemic of Karabuk province, whereas the remaining taxa have larger distribution ranges. The results show that the morphological (including pollen-morphological) traits and chromosome numbers proved to be of high diagnostic value and are very useful for determination.
Pollen and achene morphology of some Centaurea L. taxa (Asteraceae), Turkey
2018
Centaurea is one of the largest genus of the family Asteraceae. Turkey is one of the distribution areas of this genus. This genus represented with 194 taxa in Turkey, which 105 of them are endemics. In this study, pollen morphology and achene micro and macro morphology of 5 taxa belonging to Centaurea ( C. iberica, C. virgata, C. cheirolopha, C. urvelli subsp. urvelli, C. solstitialis subsp. solstitialis ) were investigated. The aim of the study was to determine taxonomic value of pollen and achene micro features. Pollen grains of Centaurea taxa observed as isopolar, with tricolporate aperture and subprolate and prolate-spheroidal pollen shape. Polar axis ranges between 30.4-49.9 µm while equatorial axis between 25.7-41 µm. The achene shape was observed as ovoid and oblong in studied taxa. SEM showed that the achene surface had a striate sculpture and was depressed on both lateral surfaces, without rare hairs. The micro characters contain polar axis, equatorial axis, pollen shape, ...
Centaurea wagenitziana (Asteraceae: Centaureinae), a new species from the Eastern Balkans
Phytologia Balcanica, 2009
Centaurea wagenitziana Bancheva & Kit Tan from SE Bulgaria and NW Turkey is described as a species new to science. Its chromosome number of 2n = 30 is a first report. It closely resembles C. amplifolia with which it had been misidentified; the latter is endemic to the Peloponnese in southern Greece and is lectotypified in this paper.
International Journal of Biodiversity Science & Management, 2005
Kazdagi (Mt. Ida: 1774 m) is in northwestern Turkey. The rock type is mainly schist, and the soil is brown forest soil without lime. For these reasons, Kazdagi is one of the most important floristic areas in Turkey. With regard to genetic resources, this area is of major importance for in situ conservation of plant genetic diversity. Centaurea odyssei Wagenitz is a threatened very local endemic species, growing only in three small areas on Kazdagi. These populations are under heavy grazing stress. Morphological, anatomical and palynological studies are described and autecological and conservation aspects of the species are discussed.
Pollen morphology of section Cheirolepis Boiss. of the genus Centaurea L. (Asteraceae) in Turkey
Bangladesh Journal of Plant Taxonomy, 2019
In this paper, the palynomorphology of 17 taxa of section Cheirolepis in Turkey, were investigated by light (LM) and scanning electron microscope (SEM). Detailed descriptions of the pollen grains were given for each taxon and a well-resolved dendrogram was generated through numerical analysis of palynological diagnostic features. The pollen grains were found to be radially symmetric, isopolar, and generally 3-zonocolporate, with the exception of C. derderiifolia, C. kotschyi var. floccosa, and C. saligna, which were also 4-zonocolporate. The shape of the pollen grains were prolatespheroidal, with the polar axes of 32.76–46.26 μm and equatorial axes of 31.86–45.82 μm. The sculpturing of the pollen grains was generally scabrate-perforate or rarely microechinate-perforate. The spines were conical with a changing base length. The length and the width of the spines varied between 0.48 and 2.28 μm and 0.4 and 3.39 μm, respectively. The number of perforations at the base of the spines rang...