B. Papp szerk.: Studia Botanica Hungarica 32. 2001 (Budapest, 2001)

Bauer, Norbert: Vascular flora of the hill Strázsa-hegy and its vicinity (Pilis Mts, Hungary)

The floristical richness of Strázsa- and Tábla-hegy is outstanding not only because of the number of species. Local variability of the Pulsatilla taxa - this time not looking at the taxonomic value of the variants - has been explored and acknowledged for a long time (GAYER 1909). It is a fact that the allelic variability of the Pulsatillas living here is outstandingly high. Colour variants are abundant but their taxonomic value is questionable. Some individuals representing the white flowered variant of Pulsatilla grandis appear both on Strázsa- and Tábla-hegy. In case of Pulsatilla nigricans some variability is also noticed, but the variability of colours, pointed out by GAYER (1909), might be attributed, at least partly, variation of different flowering stages. Pulsatillas with multiple perianths are also frequent. The taxonomic diversity of a certain area can also be expressed in the genetic variability of its flora. Specifically, reasons of the high number of species having albinic, more accurately white flowered, variants in the flora of Strázsa-hegy and its surroundings is one of the botanical mysteries. White flowered variants can be observed in the following taxa: Pulsatilla grandis (Strázsa-hegy, Tábla-hegy), Veronica austriaca (Strázsa-hegy), Dianthus giganteiformis subsp. pontederae (Strázsa-hegy), Campanula glomerata subsp. farinosa (Strázsa-hegy), Campanula sibirica, Centaurea sadleriana (Tábla-hegy), Orchis militaris (Sátorkőpuszta), Serratula tinctoria (Strázsa-hegy), Salvia pratensis (Tábla-hegy). This phenomenon can be interpreted as a sign of allelic variability of taxa which contributes greatly nature conservational merits and importance of the area. In order to comprehend and assess all values of the vascular flora of Strázsaand Tábla-hegy, the "social behaviour types" of the area were established according to BORHIDI (1995). Percentage contribution of these types does not show significant differences between the flora of Strázsa- and Tábla-hegy. High proportion of weed (W: 11-13%) and disturbance tolerant (DT: ca 22%) taxa refer to disturbance in the whole area. Contribution of these groups almost reaches that of the generalists (G: ca 40-43%). The percentage proportions of the Hungarian flora and the percentage contributions of eurytopic generalists (G) and specialists (S) in the discussed area show that the disturbance of habitats and the degradation of the flora are in an advanced phase. Spatial extension of the naturality of the area, the degree of degradation can be expressed by group proportional participation of vegetation patterns. The concurrence of Cirsium pannonicum, Crepis praemorsa, Echinops ruthenicus, Echium maculatum, Iris graminea, Iris humilis subsp. arenaria and the five Stipa species (S. capillata, S. dasyphylla, S. pennata, S. pulcherrima, S. tirsa) are considered by us as the most significant merits of the flora of the area.