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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