Urbanization is one of the major causes of species loss and the homogenization of the world's flora. Our coarse-scale floristic mapping project of the largest south Transdanubian city, Pécs, is the first grid-based urban study in Hungary that reveals the current pattern of the vascular flora. Beyond the general description of the project, the species richness, the number of native, archaeophyte, neophyte and legally protected taxa are presented in the scale of the grid units (2.2 km²) and according to the residential area of the city. Relationships between the number and proportion of natives, archaeophytes, neophytes, protected species versus the proportion of built-up areas, forest coverage and elevation are estimated by linear regression models. Among the 1458 spontaneous or subspontaneous vascular plant species of the study area 131 are legally protected. The average number of species per grid unit is 338. Regression models show that the number of aliens decreases with forest coverage and increases with the rate of built-up areas, while number of natives shows opposite trends as a function of the same variables. These opposite trends lead to the conclusion that in the case of the vascular flora of Pécs the “poor get richer” theory is supported. Among the most frequent species hemicryptophytes, widespread, native and zoochorous plants are dominant. The most widespread four invasive taxa are native to North America.

中文翻译：

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佩奇及其邻近地区（匈牙利南部）的维管植物 I.：物种丰富度以及本地和外来植物的分布

城市化是物种丧失和世界植物同质化的主要原因之一。我们对南外最大城市佩奇的粗略植物区系测绘项目是匈牙利第一个基于网格的城市研究，揭示了当前维管植物的模式。除了项目的一般描述外，物种丰富度、原生、古生植物、新植物和受法律保护的分类群的数量以网格单元的规模（2.2 km ²) 并根据城市的居住区。本地人、古植物、新植物、受保护物种的数量和比例与建成区比例、森林覆盖率和海拔之间的关系通过线性回归模型进行估计。在研究区的 1458 种自发或亚自发维管植物中，有 131 种受到法律保护。每个网格单位的平均物种数量为 338。回归模型表明，外来物种的数量随着森林覆盖率的增加而减少，随着建筑面积的增加而增加，而本地人的数量随着相同变量的变化呈现相反的趋势。这些相反的趋势导致结论，在佩奇的维管植物群中，“穷人变得更富有”的理论得到了支持。在最常见的半隐植物中，分布广泛，原生植物和游动植物占优势。分布最广的四种入侵类群原产于北美。