This thesis aims to study patterns of taxonomical and functional diversity of spontaneous vascular plants growing in lawns of public green areas of neighbourhoods with different socioeconomic status (SES). In Valdivia, a medium-sized city located in a world hotspot of biodiversity in Chile, I performed extensive sampling at the neighbourhood scale in 120 plots of 20m2, over 3 years identifying and measuring all the spontaneous vascular species. The results highlight the relevance of anthropogenic factors as habitat type and SES as drivers of species richness and variation in resource-use traits at the fine neighbourhood scale. Additionally, my results suggest the high relevance of bottom-up processes from householders to top stakeholders in positively shaping the diversity in urban areas given the relevance of SES as a driving factor of change in species richness and traits. This means that the socioeconomic status of neighbourhoods and the characteristics associated with it (level of education, gardening practices, etc.) influence strongly the way in which the diversity of urban areas is composed.