Folia Geobotanica et Phytotaxonomica

Tomšovic, Pavel; Krahulcová, Anna

doi: 10.1007/BF02912754pmid: N/A

Polycnemum majus A. Br. (Chenopodiaceae) represents one of the Euro-Asian species disappearing as a consequence of man's activities. The paper presents a brief survey of its morphology, distribution (with emphasis on the W part of Czechoslovakia), and taxonomy. The ecological characterization of communities with occurrence ofP. majus is given. From the karyological point of view,P. majus represents a further case of hexaploidy in theChenopodiaceae family, hitherto known in approximately 10% of genera. The basic chromosome number of x=9 is proposed, with respect to chromosome numbers ascertained inP. majus for the first time (2n=54) and inP. arvense (2n=18). The annual hexaploid speciesP. majus was proved to be potentially self-fertile.

Speta, Franz

doi: 10.1007/BF02912756pmid: N/A

Ornitogalum macrum Speta, a new species, is described from the Çakilli-Pass on the road from Akseki to the Bey sehir-Lake in Turkey. It is characterized by its tenderness. Roots turning yellow and concrescente leaves of the bulb speak in favour of a membership to theO. umbellatum group. But the late appearance of the foliage leaves in spring and the lack of ridges on the gynoeceum have hitherto never been found in this connection. There is however an indisputable similarity as to characteristics of theO. undulatum group. The chromosome number is 2n=54. The interphase nuclei are chromomeric.

Rychnovská, Milena

doi: 10.1007/BF02912752pmid: N/A

Neuhäusl, Robert

doi: 10.1007/BF02912747pmid: N/A

Lepš, Jan

doi: 10.1007/BF02912755pmid: N/A

Hegazy, A.; Moser, W.

doi: 10.1007/BF02912748pmid: N/A

The seedlings of twenty eight annual and perennial desert plants belonging to fifteen families were raised under controlled growth conditions and subjected to a range of tests. The water use efficiency, photosynthesis, extreme temperatures and drought tolerance were monitored. The results were discussed for their ecological significance as a basic information to applied research. Seedlings which were more tolerant to extreme high and low temperatures and drought were more capable of controlling water loss through better water use efficiency. At temperatures below 25°C, the annual plants had higher photosynthetic rate than perennials, whereas at higher temperatures, the perennials were advantaged.

Krüger, Levinia; Kirst, Gunter

doi: 10.1007/BF02912749pmid: N/A

In an ecological field study, plants ofBolboschoenus maritimus (L.)Palla (Scirpus maritimus L. s. l.) growing in oligohaline and in mesohaline soils were compared. Differences between both populations mainly concerning osmotic potential, water potential and ionic concentrations could be related with the salt content at both sites, whereas transpiration and photosynthesis did not differ significantly. Water potential of the cell sap was affected by several external factors.

Chrtek, Jindřich; Osbornová, Jana

doi: 10.1007/BF02912750pmid: N/A

Species of familyCuscutaceae belonging to three genera, viz.Grammica, Monogynella andCuscuta s. str. were studied in Egypt, some of them also in Iraq. Descriptions, keys, tables with comparisons of main morphological features, as well as taxonomic, chorological, and ecological notes, and also phytocartograms of the following taxa growing or expected in Egypt are given:Grammica campestris (Yuncker) Hadač etChrtek,G. chinensis (Lam.) Hadač etChrtek,Monogynella monogyna (Vahl) Hadač etChrtek,Cuscuta pedicellata Ledeb.,C. epilinum Weihe exBoenn.,C. palaestina Boiss. (incl.C. balansae Boiss. etReuter exYuncker),C. planiflora Ten. (incl.C. approximata Babingt.), andC. brevistyla A. Rich. A new variety ofMonogynella monogyna, var.hadacii, was described from Iraq. A new combination,Monogynella monogyna subsp.esquamata (Engelm.) Chrtek etOsbornová, was made. Main attention was given toGrammica campestris, the species that is nowadays expanding in Egypt.

Pyšek, Petr

doi: 10.1007/BF02912746pmid: N/A

The paper deals with the vegetation of village settlements at the territory of the Bohemian Karst. In the first part of this study, syntaxonomy of ruderal communities is presented. Deductive method of syntaxonomical classification was applied. An attempt for numerical evaluation of a species diagnostic value in phytosociology is presented. Discussion remarks on the current state of ruderal phytosociology are included.

Holub, Josef

doi: 10.1007/BF02912753pmid: N/A

Eight newRubus species are described from the area of Czech Republic (western Czechoslovakia), four of them belonging to ser.Discolores, and one by one to subsect.Rubus, ser.Rhamnifolii, ser.Micantes and ser.Hystrices. *** DIRECT SUPPORT *** AAY02002 00005