Folia Geobotanica

Krahulcová, Anna

doi: 10.1007/bf02912771pmid: N/A

Chromosome numbers compared with as yet published data are given for the following 12 Phanerogams (both native species and aliens) from Czechoslovakia:Ambrosia trifida L.,Cardamine chelidonia L.,Dephne cneorum L.,Epipactis albensisNováková etRydlo,Linum flavum L.subsp flavum, Lunaria rediviva L.,Nepeta grandiflora M.BIEB.,Reseda luteola L.,Thlaspi montanum L.,Tithymalus salicifolius (Host)Klotzsch etGarcke,Tithymalus virgultosus (Klokov) Holub andVerbascum speciosumSchrad. subsp.speciosum. The chromosome number 2n=40 is presented for the first time in autogamousEpipactis albensisNováková etRydlo. New chromosome numbers were found inCardamine chelidonia L. (2n=32) and inTithymalus salicifolius (Host) Klotzch etGarcke (2n=40). Known but less frequent cytotypes are reported inLinum flavum L. subsp.flavum (2n=28) and inVerbascum speciosumSchrad. subsp.speciosum (2n=30).

Stoeva, Milka P.; Popova, Evgenija D.

doi: 10.1007/bf02912773pmid: N/A

Seventeen natural Bulgarian populations of the species of the genusCarex sect.Digitatae were studied morphologically and karyologically. Stepwise discriminant analysis was used as a multivariate test for the separation of groups of populations from different taxa and to find a subset of characters contributing most for this separation. The following taxa were found in Bulgaria:C. humilisLeysser var.humilis; C. humilis var.longifoliaStoeva etPopova, var. n.;C. digitata L.;C. ornithopodaWilld. subsp.bulgarica(Vel.) Stoeva etPopova, comb. n. Aneuploid series of some chromosome numbers were found inC. digitata — 2n=48, 50, 52, 54, 56 and inC. ornithopoda subsp.bulgarica−2n=52, 53, 54, 56.C. humilis has 2n=36 and a much more heterogeneous karyotype than that of the above taxa. The values of the Euclidean distance between the populations vary within similar limits in both speciesC. humilis andC. digitata; this is not in accordance with the karyological results. The within and between population morphological variations were compared in each species. The first dominates in overall variation, which is probably connected with the very large populations and their mosaic space structure.

Szlachetko, Dariusz L.

doi: 10.1007/bf02912775pmid: N/A

A new monotypic genusBurnsbaloghiaSzlachetko-based on the speciesSpiranthes diaphanaLindl.-originating from the state of Oaxaca, Mexico, is described. Four illustrations are provided.

Golub, V. B.; Saveljeva, L. F.

doi: 10.1007/bf02912776pmid: N/A

The semi-desert zone of the northern Precaspian Lowland is distinguished by the occurrence of closed-drainage depressions (limans) which are filled with melted snow in spring and usually dry out in summer. The plant communities of the above limans are discussed in this paper, along with descriptions of syntaxa belonging to the following classes:Phragmitetea R.Tx. etPrsg. 1942,Bolboschoenetea maritimiVicherek etR. Tx. 1969 exR. Tx. etHülb. 1971,Molinio-ArrhenathereteaR. Tx. 1937 em.Mirk. etNaumova 1986,Asteretea tripoliiWesthoff etBeeftink 1962 inBeeftink 1962,Festuco-LimonieteaKarpov etMirk. 1985,Polygono-Artemisietea austriacaeMirk., Sakh. etSolm. inMirk. et al. 1986.

Bagi, István

doi: 10.1007/bf02912777pmid: N/A

Field texture is of essential importance in the development of the mud vegetation of dwarf-plants. Soil consisting of a high proportion of small primary particles is able to store appropriate quantities of water, and transfers water to the plants with difficulty. Thus, the species which have adapted to these conditions have a competitive advantage over concurrent ones. The clay-rich soil hinders the availability of nitrogen. Hence, nitrophilous vegetation does not develop here. Due to the high adsorption capacity of the soil it may contain a large amount of available phosporus and potassium.The low osmotic activity of the soil is favourable for the development of the mud vegetation of dwarf-plants with a high cover degree.

Pyšek, Petr

doi: 10.1007/bf02912779pmid: N/A

The spread ofHeracleum mantegazzianum in the Czech Republic has been reconstructed on the basis of floristic data. The species has spread from several spatially independent localities which have originated from the West Bohemian population introduced in the 19th century. Its expansion first followed the courses of great rivers. An exponential increase in the number of localities reported in particular years and in the cummulative number of localities was found. The species abundance decreases from the region of original introduction, which is located in the westernmost part of the country, to the east. The rate of spread in the last sixty years was the same in the Czech Republic and in Great Britain. The species is, however, more widespread in the North of Europe presumably because of the more favourable climate. It is found most frequently in habitats that encourage the greatest movement of diaspores. Floristic data can be used to infer retrospectively the dynamics of invasion, of a species in a given area provided that there is a sufficient amount of floristic research over time.

Lhotská, Marie; Moravcová, Lenka

doi: 10.1007/bf02912780pmid: N/A

The ripened seeds show no marked dormancy and germinate within wide limits of temperature, where the temperatures of 6–10/25°C represent the optimum. 18 months old seeds germinated at the temperature of 10/25°C by 69% 13 year old seeds did not germinate. This annual winter species reproduces only in the generative way, the seeds sown in the middle of October 1987 and 1988 sprouted at the end of October, and the seedlings with 1–2 pairs of true leaves survived successfully the winter.

Studnička, Miloslav

doi: 10.1007/bf02912782pmid: N/A

This paper deals with the carnivorous plants of the genusPinguicula occurring particularly in wet habitats. Nevertheless, some species are able to survive longer dry periods in the course of which they form succulent rosettes. Leaf anatomy has been investigated in 6 Mexican species of this kind. The following features frequent in typical succulents have been found: green sheats of vascular bundles (indicating the C4-pathway of CO2 assimilation in photosynthesis) and the chlorenchyma located in the lower (= abaxial) part of the mesophyll, under a layer of translucent water-storage tissue. These features are discussed with regard to phylogenetical relationship within the genusPinguicula.