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Abstracts of volume 73, no. 3, 2001

Krahulcová A., Krahulec F. & Chrtek J. jun. (2001): Chromosome numbers and reproductive systems in selected representatives of Hieracium subgen. Pilosella in the Krkonoše Mts (the Sudeten Mts). 2. - Preslia, Praha, 73: 193-211.
Chromosome numbers and reproductive systems of the following species are reported from the Krkonoše Mts (the Sudeten Mts): a) species not previously studied within this area: H. fuscoatrum Nägeli et Peter (2n = 36, apomictic), H. blyttianum Fr. (2n = 36, apomictic), H. tubulascens Norrl. (2n = 36, apomictic), H. bauhini Besser (2n = 45, apomictic), H. onegense (Norrl.) Norrl. (2n = 18, sexual); b) new cytotypes recorded: H. floribundum Wimm. et Grab. (2n = 18, sexual), H. apatelium Nägeli et Peter (2n = 45, apomictic), H. iseranum Uechtr. (2n = 45, apomictic), H. aurantiacum L. (2n = 45, apomictic), H. stoloniflorum Waldst. et Kit. (2n = 45); c) additional data on distribution and reproduction mode of species previously studied: H. pilosella L. (2n = 36, sexual), H. lactucella Wallr. (2n = 18), H. caespitosum Dumort. (2n = 36, apomictic), H. aurantiacum L. (2n = 36, apomictic), H. schultesii F. W. Schultz (2n = 36, apomictic), H. glomeratum Froel. (2n = 45, apomictic), H. floribundum Wimm. et Grab. (2n = 36, apomictic), H. piloselliflorum Nägeli et Peter (2n = 36, both sexual and apomictic; 2n = 45, apomictic; 2n = 54, apomictic). Chromosome numbers are given for the first time for H. fuscoatrum and H. tubulascens, the record of diploid sexual plants is a novelty for H. floribundum. New ploidy levels are also reported for H. apatelium and H. iseranum. The richness of the Krkonoše Mts in Hieracium subgen. Pilosella is discussed with respect to number of basic (4) and sexual (7) species. In the Czech Republic as well as in the Sudeten Mts, two species of this subgenus (H. fuscoatrum and H. tubulascens) were recorded for the first time.

Danihelka J. (2001): Achillea pannonica in the Czech Republic, with taxonomic remarks. - Preslia, Praha, 73: 213-244.
Achillea pannonica Scheele is an octoploid species of the A. millefolium group. Based on herbarium and field studies, a taxonomic and phytogeographic account of this taxon is provided in the Central European part of its range. The synonymy of A. pannonica includes A. seidlii J. Presl et C. Presl, A. millefolium var. lanata W. D. J. Koch, and Achillea millefolium f. contracta Schltdl. Achillea pannonica is a clearly delimited species: no variation deserving taxonomic recognition was observed in Central European plants. Morphological differences between A. setacea Waldst. et Kit. and A. pannonica are summarised in a table. Achillea pannonica is classified as a subtemperate to submeridional subcontinental European species or as a Pontic element with overlaps to the Balkans and westernmost Anatolia. Its range in the Czech Republic is divided into two parts including northern and central Bohemia, and southern and central Moravia, all warm to moderately warm and dry to moderately dry regions. Two distribution maps based on more than 1280 specimens revised are presented. The distribution pattern of A. pannonica in the Czech Republic which coincides well with the distribution of thermophilous oak woods of the order Quercetalia pubescenti-petraeae can be compared to that of Anagallis foemina, Cerasus fruticosa, Dictamnus albus, and Lavatera thuringiaca. It is probably a relict of the more continuous range which may have developed in the early Holocene. Achillea pannonica is a heliophilous to heliosciophilous species of dry grasslands, fringe communities, thermophilous oak forests and some thermophilous (sub)ruderal communities. It grows on several types of rock and often prefers calcareous substrata such as limestone and loess. At several sites, it was observed to occur together with other yarrows. Hybridization with A. millefolium s. str. sometimes occur, and the new nothospecies, A. ×incognita, is formally described; however, its reliable recognition requires chromosome counts.

Trávníček B. (2001): Taxa of the genus Pseudolysimachion (Scrophulariaceae) in the Czech Republic. II. Geographical distribution of species of sect. Pseudolysimachion and hybrids. - Preslia, Praha, 73: 245-272.
Notes on variability and identification of the Pseudolysimachion species (Scrophulariaceae) of the sect. Pseudolysimachion (P. orchideum (Crantz) Wraber, P. spicatum (L.) Opiz and P. incanum (L.) Holub) and two interspecific hybrids (P. maritimum × spurium and P. maritimum × spicatum) in the Czech Republic are given. The dot maps of the distribution and lists of localities of all mentioned taxa are presented.

Chrtek J. & Skočdopolová B. (2001): Oenothera flava subsp. taraxacoides – a new alien plant in the Czech Republic. - Preslia, Praha, 73: 273-276
Oenothera flava (A. Nels.) Garrett subsp. taraxacoides (Woot. et Standl.) W. L. Wagner, a new alien plant for the Czech Republic, has been found in a waste place in the town Nový Bydžov, East Bohemia. It is highly probable, that the taxon is reported from Europe for the first time.

Štěpánek J. & Kirschner J. (2001): A new hexaploid species of Taraxacum sect. Palustria from W Alps. - Preslia, Praha, 73: 277-279.
Taraxacum flos-lacus Kirschner et Štěpánek, spec. nova is described from subalpine and alpine belts of Alpi Graie, E France. It represents the second known hexaploid species of the sect. Palustria.


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