Copyright © Czech Botanical Society

Abstracts of volume 73, no. 1, 2001

Danihelka J. & Rotreklová O. (2001): Achillea pratensis (Asteraceae), a recently recognized species of the Czech flora. - Preslia, Praha, 73: 1-27.
Milfoils (Achillea millefolium agg.) of the Czech Republic were studied in the field as well as in most of the Czech herbaria. Achillea pratensis Saukel et Länger, recently described from Austria, was found to be common in the Czech Republic. Its occurrence was confirmed by chromosome counts (2n = 36) in 74 plants from 26 localities, and more than 240 herbarium specimens of this species were revised. Seasonal variation of A. pratensis was analysed using canonical discriminant analysis. The first generation (spring) and second generation (summer) shoots proved to be morphologically different (they can be separated mainly by number of nodes, shoot height, leaf width, and bract length). Thus, the description of the species provided by Saukel & Länger had to be modified to include spring shoots. Morphological and taxonomic delimitations from other tetraploids (A. collina Rchb.) have not yet been satisfactorily defined. Also, taxonomic relationships to A. tenuis Schur described from Transylvania as well as to A. submillefolium Klokov et Krytzka described recently from the Ukraine remain to be clarified. The phytosociological affinity of A. pratensis in the Czech Republic is documented by 18 relevés. The species is confined mainly to mesophilic meadows of the alliance Arrhenatherion, to grasslands such as street and garden lawns which can be classified only to the order Arrhenatheretalia as well as to continental floodplain meadows of the alliance Cnidion venosi. Sympatric occurrence of several Achillea taxa of different ploidy levels was observed at several localities and the presence of natural hybrids (A. millefolium × A. pratensis, 2n = 45) was indicated at two sites by chromosome counts.

Hendrych R. (2001): Flora – of the Krkonoše Mts especially – four centuries ago. - Preslia, Praha, 73: 29-57. [In Czech]
An attempt is made to analyse a floral work published by Caspar Schwenckfelt in 1600. This work allegedly deals with the territory of historical Silesia, but in fact it concerns mainly the surroundings of the Silesian town Jelenia Góra (formerly Hirschberg), and first of all both Silesian and Bohemian side ot the Krkonoše (Giant Mts). The ma-jority of plants reported here were more frequent then than in the recent time. Species not found in the territory later on are discussed.

Kaplan Z. (2001): Taxonomic and nomenclatural notes on Luzula subg. Pterodes. - Preslia, Praha, 73: 59-71.
New taxa and combinations are given resulting from a revision of Luzula subg. Pterodes (Griseb.) Buchenau for the monographic treatment of Juncaceae for Species plantarum: Flora of the world. Luzula jimboi Miyabe et Kudo subsp. atrotepala Z. Kaplan, subsp. nova, and L. plumosa E. Mey. subsp. dilatata Z. Kaplan, subsp. nova, are described. Three new combinations, L. forsteri (Sm.) DC. subsp. rhizomata (Ebinger) Z. Kaplan, comb. nova, L. acuminata Raf. subsp. carolinae (S. Watson) Z. Kaplan, comb. nova, and L. plumosa E. Mey. subsp. reflexa (Ebinger) Z. Kaplan, comb. nova, are proposed for taxa with obvious geographically correlated variations. Identity of L. cechica Domin, a name proposed for the putative hybrid of L. luzuloides × L. pilosa, and that of a misapplied name L. rostrata Buchenau is elucidated. Diagnostic characters of members of taxonomically difficult groups are given. Eight names are lectotypified.

Kučera J., Voříšková L. & Blom H. H. (2001): Grimmia teretinervis (Grimmiaceae, Musci) in the Czech Republic. - Preslia, Praha, 73: 73-77.
Single specimen of Grimmia teretinervis Limpr., collected in 1896 near Prague (Bohemian Karst [=Český kras], Central Bohemia, Czech Republic), was discovered during the revision of the type material of Schistidium in PRC. Subsequent search at the locality did not result in re-finding of this rare species, nevertheless another population was independently found at a nearby locality. Remarks on the threatened status in the Czech Republic are given.


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