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Abstrakty/Abstracts

Zprávy České botanické společnosti 44/2, 2009


Abstrakty/Abstracts


Šumberová K. & Ducháček M.
Gratiola neglecta - nový zavlečený druh pro květenu České republiky
Gratiola neglecta - a new alien species for the flora of the Czech Republic
Abstract
Gratiola neglecta Torr. (Scrophulariaceae) is an annual wetland herb of North-American origin. It has been reported from Europe since the beginning of the 20th century, but only a few localities from three countries have been published to date. In this paper we report the first two localities of G. neglecta in the Czech Republic. The species was found on wet muddy substrates in habitats used in fish farming. We describe the morphology of the species in comparison with its congeners and provide information on its biology and ecology, including the vegetation it grows in and seed bank analysis. The probable origin of the Czech populations and vectors of seed dispersal are discussed, too.

Hroudová Z.
Květena a vegetace obnaženého dna rybníka Martiňák (východní kraj Prahy)
Flora and vegetation of emerged bottom of the Martiňák fishpond (eastern border of the city of Prague)

Abstract
The species composition of the vegetation which inhabited an exposed bottom in Martiňák fishpond (eastern periphery of the city of Prague) was studied from summer to autumn 2009. The Rumicetum maritimi assoc. covered most of the fishpond area; nevertheless, differences in abundance of some species (especially Veronica anagallis-aquatica, V. beccabunga) reflected gradual removal of bottom sediments and formation of new open soil surface. A long-term persistent soil seed bank is supposed to be the source of diaspore forming ephemeral vegetation of the fishpond bottom.

Hadinec J & Lustyk P.
Additamenta ad floram Reipublicae Bohemicae. VIII.
Additions to the flora of the Czech Republic. VIII.

Abstract
This eight part of floristic contributions includes newly published data of critically endangered species and data unpublished so far. Data of alien species found in the Czech Republic for the first time (Acanthus hungaricus, Allium cristophii, A. stipitatum, Amelanchier lamarckii, A. spicata, Amsickia lycopsoides, Campanula lactiflora, Dittrichia graveolens, Euphorbia agraria, Ferulago confusa, Gilia achilleifolia, Hordeum brevisubulatum, Legousia pentagonia, Malus fusca, and Stachys setifera) are summarised. The species Carex derelicta, Rubus silvae-norticae, Sorbus albensis, S. milensis, and S. portae-bohemicae, described from the Czech Republic as new to science in 2008 and 2009, are also listed below. Furthermore, critically endangered species (according to the Black and Red List of Vascular Plants of the Czech Republic) are reported from new sites (e.g. Aira caryophyllea, Asplenium adianthum-nigrum, Botrychium matricariifolium, Carex alba, C. dioica, Centaurea stenolepis, Eleocharis quinqueflora, Epipogium aphyllum, Gentianella amarella subsp. amarella, Geranium divaricatum, Gymnadenia densiflora, Hackelia deflexa, Ophrys apifera, Orobanche picridis, O. purpurea subsp. bohemica, Polycnemum arvense, Pyrola media, Thalictrum simplex subsp. galioides, and Thesium ebracteatum). Finally, less rare threatened species are mentioned from areas where they had not been recorded yet.