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Abstrakty/Abstracts

Zprávy České botanické společnosti 49/1, 2014


Abstrakty/Abstracts

Moltašová H., Rotreklová O., Danihelka J., Gottschlich G. & Chrtek J. jun.
Jestřábník hroznatý (Hieracium racemosum) v České republice
Hieracium racemosum in the Czech Republic

Abstract
The distribution of Hieracium racemosum in the Czech Republic was studied based on herbarium specimens deposited in 22 public herbaria. This species, classified within H. sect. Italica, is one of 58 native hawkweeds (Hieracium s. str.) of the Czech flora. From H. sabaudum, the most similar species, it may be distinguished by usually shortly petiolate lower stem leaves, racemous to paniculate synflorescence, rather long inner involucral bracts, which are dark to pale green and have a light green margin, as well as by yellowish or grey, rarely red to chestnut-brown achenes and usually dentate (non-fimbriate) receptacle pits. The leaf arrangement, i.e. the concentration of leaves in the middle or lower third of the stem, frequently used as the main character to distinguish H. racemosum from H. sabaudum, has only limited diagnostic value. Traditionally, six subspecies are reported from the Czech Republic, with most Czech populations of H. racemosum assigned to H. racemosum subsp. barbatum and subsp. racemosum. Using flow cytometry measurements and chromosome counts, three plants originating from two populations from the south-eastern parts of Czechia were assessed to be triploid (2n ~ 3x) and one plant had a chromosome number of 2n = 27, respectively. We revised 541 herbarium specimens of this species collected in the country, of which 432 (i.e. about 84%) were originally identified correctly (including taxonomic synonyms). However, another 400 specimens originally identified as H. racemosum were revised as H. sabaudum (97%) or H. umbellatum (3%). In the Czech Republic, most localities of H. racemosum are concentrated in Moravia (eastern part of the country). Isolated locations are found in eastern Bohemia and single outposts further towards the west. Based on the number of specimens revised, the distribution map presented here may be considered representative. The infraspecific taxonomy of H. racemosum and possible occurrence of H. neolatyphyllum in te Czech Republic require further research.

Hroneš M., Nývltová V., Brandová B., Ševčík K., Dančák M. & Vašut R. J.
Vysokohorské vrby (Salix) sudetských pohoří České republiky - rozšíření a současný stav populací
Alpine willows (Salix) of the Czech Sudetes - distribution and present state of populations

Abstract
Alpine willows of the Czech Republic represent a group of species with an extremely vulnerable relic distribution. Populations of four species, i.e. Salix bicolor, S. hastata, S. herbacea and S. lapponum occur at a rather limited number of localities in the Krkonoše Mts and/or in the Hrubý Jeseník Mts and they are usually consisting of low number of individuals. This study compares the past records of the occurrence of these species (based on herbarium specimens and literature records) with our recent field observations. We discuss the decline of the number of populations as well as individuals, recent distribution and number of localities, doubtful records and future prospects of the studied populations.

Laburdová J. & Hájek M.
Vztah vegetace pramenišť západočeské zřídelní oblasti k chemismu prostředí
Relationships between spring vegetation and environmental chemistry in West-Bohemian mineral-spring region

Abstract
The paper deals with the relationship between vegetation and water chemistry in the West Bohemian spring area (western part of the Czech Republic). Springs in the area have various water chemistry features, with increased metal concentration in some cases, and the relationships between vegetation and environmental chemistry are not yet well known. In the study area, 28 treeless springs were chosen to investigate this relationship. Phytosociological relevés were made at all localities and are presented in this paper. Chemical parameters of water and plant biomass were measured. Water pH appeared to have a highly significant effect on the species composition of the vegetation. The first DCA axis, corresponding to the poor-rich vegetation gradient, correlated with pH and concentration of calcium, magnesium and sodium. Concentration of particular elements in water correlated largely to that in the bryophyte and vascular plant biomass and agreed with the interpretations of the DCA ordination axes of vegetation composition. However, the second DCA axis, corresponding to an increasing occurrence of nutrient-demanding meadow species, only correlated with the N:P ratio in vascular plant biomass, which provided a clear interpretation of this axis in terms of nutrient availability. The revealed relationships between vegetation gradients and water and biomass chemistry are probably of general validity since they were also found in other temperate regions.

Hadinec J. & Lustyk P. [eds]
Additamenta ad floram Reipublicae Bohemicae. XII.
Additions to the flora of the Czech Republic. XII.

Abstract
The twelfth part of floristic contributions includes newly published data of critically endangered species and data unpublished so far. Data of taxa newly discovered on the territory of the Czech Republic (Buglossoides incrassata subsp. incrassata, B. incrassata subsp. splitgerberi, Festuca pseudodalmatica, Sorbus barrandienica and S. omissa) and data of alien species found in the Czech Republic for the first time (Bromus bromoideus, Cotula coronopifolia, Euphorbia prostrata and bamboo Pleioblastus chino) are summarised. Furthermore, critically endangered species (according to the Red List of Vascular Plants of the Czech Republic) are reported from new sites (e.g. Agropyron pectinatum, Arabis nemorensis, Calamagrostis stricta, Cardamine parviflora, Carex chordorrhiza, Carlina acaulis subsp. caulescens, Cleistogenes serotina, Corrigiola littoralis, Drosera intermedia, Epipactis moravica, Erica tetralix, Filago lutescens, Herniaria hirsuta, Juncus gerardii, Listera cordata, Lycopodiella inundata, Myosotis stenophylla, Orchis morio, Ornithopus perpusillus, Polycnemum arvense, P. majus, Potentilla rupestris, Salix myrsinifolia, Tillaea aquatica and Urtica kioviensis). Finally, less rare and threatened species are reported from areas where they had not been recorded yet (Cephalanthera longifolia, Epipactis microphylla, Leersia oryzoides, Phegopteris connectilis, Pyrola media, Stellaria palustris). Examination of herbarium material of alien grasses revealed six species new to the Czech Republic: Chloris pectinata, Ch. divaricata, Eleusine coracana subsp. coracana, E. tristachya, Leptochloa decipiens subsp. peacockii and L. divaricatissima. These all occurred in this country as casuals, most of them introduced with wool of Australian origin. In contrast, re-identification of herbarium vouchers has showed that the following species were mentioned in the literature for the Czech Republic erroneously: Chloris radiata, Enteropogon acicularis (syn.: Chloris acicularis), Eriochloa punctata, Leptochloa panicea s.l. (incl. L. mucronata and L. filiformis) and Sporobolus indicus. No specimen of Chloris pycnothrix was seen in the studied herbarium material, so that the occurrence of this species in the Czech Republic is doubtful.