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)

serve also as good supplements assessment of the actual condition of the flora and vegetation of the area. BAUER (2000) assessed and analysed the flora and vegetation of Strázsa and Tábla-hegy in details. BAUER etal (2000) and BARIN A (2000) have published data about the flora of the sandpit of Sátorkőpuszta. The diversity shown in the geography of the area provided a good basis for the development of an extremely diverse flora and a varied overall picture of the vegetation. Heterogenity and provisionality deriving from the climatic, geological, and geomorphological background as well as the landscape geographical and phytogeographical border situation are the most important factors resulting in flora diversity. A decrease in precipitation and a change in its annual distribution - lacking the second maximum of rainfall (BORHIDI 1961, 1967) - are the most important signs of a mesoclimate different from that of the larger area. ZÓLYOMI (1958) has put emphasis several times on the importance of presence or lack of the second maximum of precipitation in the development of vegetation structure. The second maximum of rainfall which is apparent in the higher ranges of the Pilis- and Gerecse Mts is already missing in the proximity of Strázsa-hegy which marks a relatively shaip macroclimatic border (ZÓLYOMI 1942). On a macroclimatic border area the selective effect of the bedrock becomes stronger (ZÓLYOMI 1942), but where the occurrence of the different types of rocks is confined to tiny mosaics and we have to count with their concurrences (e.g. significant (10 cm thick) sand veil or sandstone conglomerate on limestone) - transition of vegetation types into each other is not surprising. MATERIAL AND METHODS The author first recognized the floristical richness of Strázsa-hegy and its vicinity in the summer of 1994. Systematic study of the vascular flora and vegetation was conducted between 1995 and 2000. In order to have a more complete flora list, data of former references were incorporated also. Identification of the plant material was based on SIMON ( 1992) and ROTHMALER ( 1970). Subsequently, a list of vascular plants of the area was compiled. Changes in the flora of Strázsa-hegy and its surroundings was followed by a comparative assessment of reference data. The nomenclature has followed SIMON (2000). Herbarium specimens prepared during the work are primarily deposited in the Department of Botany, Hungarian Natural History Museum (Budapest), partly also in the Department of Botany, University of Veszprém (Veszprém).