We present a statistically derived phytogeographic regionalization based on the spatial distribution of native woody flora, investigating environmental correlates and assessing congruence between the spatial patterns of species, genera, and families. A sector of central peninsular Italy (Lazio and Abruzzo regions) was selected as a case study. A rich georeferenced floristic database was compiled, including information from different sources. A total of 43,968 occurrence data, 290 10 × 10 km cells, 224 species, 103 genera, and 80 families was used; Ward’s clustering was performed to identify phytogeographic units. Three well-defined and relatively spatially coherent units were identified at the species, genus, and family levels: a Mediterranean unit, a Transition unit, and a Eurosiberian one. Congruence between taxonomic levels was well supported. Further divisions in subunits were detected using species data. The main environmental descriptors of the clusters were distance from the sea, elevation, temperature, and lithology.

中文翻译：

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基于本地木本植物群检测植物地理单位：意大利中部半岛的案例研究

我们提出了基于本地木本植物群空间分布的统计衍生的植物地理区域化，调查环境相关性并评估物种、属和科的空间模式之间的一致性。意大利中部半岛（拉齐奥和阿布鲁佐地区）的一个部门被选为案例研究。一个丰富的地理参考植物区系数据库被编译，包括来自不同来源的信息。共使用了43968个发生数据，290个10×10km细胞，224种，103属，80科；执行 Ward 聚类以识别植物地理单位。在物种、属和科级别确定了三个定义明确且空间相对一致的单位：地中海单位、过渡单位和欧西伯利亚单位。分类水平之间的一致性得到了很好的支持。使用物种数据检测到亚基的进一步分裂。集群的主要环境描述符是距海的距离、海拔、温度和岩性。